using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class SolutionTest {
    public static int Main(string[] args) {
        bool allTestsPassed = true;

        // Test case 1
        int result1 = Solution.SumOfEvens(new List<int> { 2, 5, 8, 11, 14 });
        if (result1 != 24) {
            Console.WriteLine($"Test case 1 failed: Expected 24, got {result1}");
            allTestsPassed = false;
        }

        // Test case 2
        int result2 = Solution.SumOfEvens(new List<int> { -2, 3, -4, 5, -6 });
        if (result2 != -12) {
            Console.WriteLine($"Test case 2 failed: Expected -12, got {result2}");
            allTestsPassed = false;
        }

        // Test case 3
        int result3 = Solution.SumOfEvens(new List<int> { 1, 3, 5, 7 });
        if (result3 != 0) {
            Console.WriteLine($"Test case 3 failed: Expected 0, got {result3}");
            allTestsPassed = false;
        }

        // Test case 4
        int result4 = Solution.SumOfEvens(new List<int> { 0, -2, 4, 6 });
        if (result4 != 8) {
            Console.WriteLine($"Test case 4 failed: Expected 8, got {result4}");
            allTestsPassed = false;
        }

        // Test case 5
        int result5 = Solution.SumOfEvens(new List<int> { 10, 20, 30, 40, 50 });
        if (result5 != 150) {
            Console.WriteLine($"Test case 5 failed: Expected 150, got {result5}");
            allTestsPassed = false;
        }

        if (allTestsPassed) {
            Console.WriteLine("All test cases passed successfully.");
            return 0;
        } else {
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class Solution {
    public static int SumOfEvens(List<int> numbers) {
        int sum = 0;
        foreach (int num in numbers) {
            if (num % 2 == 0) {
                sum += num;
            }
        }
        return sum;
    }
    public static void CheckFunction() {
        Debug.Assert(SumOfEvens(new List<int>{2, 5, 8, 11, 14}) == 24);
        Debug.Assert(SumOfEvens(new List<int>{-2, 3, -4, 5, -6}) == -12);
        Debug.Assert(SumOfEvens(new List<int>{1, 3, 5, 7}) == 0);
        Debug.Assert(SumOfEvens(new List<int>{0, -2, 4, 6}) == 8);
        Console.WriteLine("All test cases passed successfully.");
    }

}

Can you write a C# method to find the sum of all even numbers in a given list of integers? Your method should be able to handle any list of integers provided to it and return the sum of only the even numbers. For instance, if the method is given a list containing the numbers [2, 5, 8, 11, 14], it should return 24, as 2, 8, and 14 are even, and their sum is 24. Make sure to include all necessary imports and ensure your code snippet is self-contained. Additionally, include a function to test your method with different data points to verify its correctness.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class Solution
{
    public static int SumOfEvens(List<int> numbers) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;

#<INSERT>

class InterestCalculatorTest {
    public static void Main(string[] args) {
        int result = RunTests();
        Environment.Exit(result);
    }

    private static int RunTests() {
        bool allTestsPassed = true;

        // Test Case 1
        allTestsPassed &= TestExtractFractionalInterest(2.75, 0.75);
        // Test Case 2
        allTestsPassed &= TestExtractFractionalInterest(0.99, 0.99);
        // Test Case 3
        allTestsPassed &= TestExtractFractionalInterest(5.01, 0.01);
        // Test Case 4
        allTestsPassed &= TestExtractFractionalInterest(3.5, 0.5);
        // Test Case 5
        allTestsPassed &= TestExtractFractionalInterest(10.0, 0.0);

        return allTestsPassed ? 0 : -1;
    }

    private static bool TestExtractFractionalInterest(double input, double expected) {
        double result = InterestCalculator.ExtractFractionalInterest(input);
        if (Math.Abs(result - expected) < 0.0001) {
            Console.WriteLine($"Test passed for input {input}: Expected {expected}, got {result}");
            return true;
        } else {
            Console.WriteLine($"Test failed for input {input}: Expected {expected}, got {result}");
            return false;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
class InterestCalculator {
    public static double ExtractFractionalInterest(double interestEarned) {
        double wholeNumberPart = Math.Floor(interestEarned);
        double fractionalPart = interestEarned - wholeNumberPart;
        return fractionalPart;
    }
    public static void CheckFractionalInterest() {
        double[] testInterests = {2.75, 0.99, 5.01, 3.5};
        double[] expectedResults = {0.75, 0.99, 0.01, 0.5};
        for (int i = 0; i < testInterests.Length; i++) {
            double result = ExtractFractionalInterest(testInterests[i]);
            Console.WriteLine($"Test {i+1}: Interest = {testInterests[i]}, Expected Fraction = {expectedResults[i]}, Calculated Fraction = {result}");
            Debug.Assert(Math.Abs(result - expectedResults[i]) < 0.0001, "The calculated fraction is not as expected.");
        }
    }
}
class Program {

}

You're working on a financial application where you need to calculate the interest earned on various accounts at the end of the day. The interest calculation is based on the account balance and the daily interest rate. However, for reporting purposes, you need to separate the whole number part of the interest (which will be added to the account balance) from the fractional part (which will be kept track of separately and added once it accumulates to a whole number). Write a C# method that takes a floating-point number representing the interest earned in a day and returns just the fractional part of it.

For example, if the interest earned is 2.75, your method should return 0.75.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class InterestCalculator
{
    public static double ExtractFractionalInterest(double interestEarned) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class SolutionTest {
    public static int Main(string[] args) {
        bool allTestsPassed = true;

        // Test Case 1
        List<int> test1 = new List<int>{2, 4, 6};
        List<int> expected1 = new List<int>{4, 8, 12};
        List<int> result1 = Solution.DoubleElements(test1);
        if (!result1.SequenceEqual(expected1)) {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        List<int> test2 = new List<int>{1, 3, 5, 7, 9};
        List<int> expected2 = new List<int>{2, 6, 10, 14, 18};
        List<int> result2 = Solution.DoubleElements(test2);
        if (!result2.SequenceEqual(expected2)) {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        List<int> test3 = new List<int>{0, -1, -2, -3};
        List<int> expected3 = new List<int>{0, -2, -4, -6};
        List<int> result3 = Solution.DoubleElements(test3);
        if (!result3.SequenceEqual(expected3)) {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        List<int> test4 = new List<int>{10, 20, 30};
        List<int> expected4 = new List<int>{20, 40, 60};
        List<int> result4 = Solution.DoubleElements(test4);
        if (!result4.SequenceEqual(expected4)) {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed) {
            Console.WriteLine("All test cases passed.");
            return 0;
        } else {
            Console.WriteLine("Some test cases failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class Solution {
    public static List<int> DoubleElements(List<int> numbers) {
        List<int> doubledNumbers = new List<int>();
        foreach (int number in numbers) {
            doubledNumbers.Add(number * 2);
        }
        return doubledNumbers;
    }
    public static void CheckFunction() {
        Console.WriteLine("Test Case 1: ");
        List<int> test1 = new List<int>{2, 4, 6};
        List<int> expected1 = new List<int>{4, 8, 12};
        Console.WriteLine("Expected: [4, 8, 12], Got: [" + string.Join(", ", DoubleElements(test1)) + "]");
        Console.WriteLine("Test Case 2: ");
        List<int> test2 = new List<int>{1, 3, 5, 7, 9};
        List<int> expected2 = new List<int>{2, 6, 10, 14, 18};
        Console.WriteLine("Expected: [2, 6, 10, 14, 18], Got: [" + string.Join(", ", DoubleElements(test2)) + "]");
    }

}

Can you write a C# method that doubles each element in a given list of integers? Your method should accept a list of integers as its input and return a new list where each element has been multiplied by 2. For example, if the input list is [2, 4, 6], the output should be [4, 8, 12]. Additionally, ensure to include a function that can verify the correctness of your method using a few test cases.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class Solution
{
    public static List<int> DoubleElements(List<int> numbers) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class ElementDoublerTest {
    public static int Main(string[] args) {
        bool allTestsPassed = true;

        // Test Case 1
        List<int> input1 = new List<int> { 1, 2, 3 };
        List<int> expected1 = new List<int> { 2, 4, 6 };
        List<int> result1 = ElementDoubler.DoubleElements(input1);
        if (!result1.SequenceEqual(expected1)) {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        List<int> input2 = new List<int> { 0, -1, -2 };
        List<int> expected2 = new List<int> { 0, -2, -4 };
        List<int> result2 = ElementDoubler.DoubleElements(input2);
        if (!result2.SequenceEqual(expected2)) {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        List<int> input3 = new List<int> { 10, 20, 30 };
        List<int> expected3 = new List<int> { 20, 40, 60 };
        List<int> result3 = ElementDoubler.DoubleElements(input3);
        if (!result3.SequenceEqual(expected3)) {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        List<int> input4 = new List<int> { };
        List<int> expected4 = new List<int> { };
        List<int> result4 = ElementDoubler.DoubleElements(input4);
        if (!result4.SequenceEqual(expected4)) {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        // Test Case 5
        List<int> input5 = new List<int> { 5 };
        List<int> expected5 = new List<int> { 10 };
        List<int> result5 = ElementDoubler.DoubleElements(input5);
        if (!result5.SequenceEqual(expected5)) {
            Console.WriteLine("Test Case 5 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed) {
            Console.WriteLine("All test cases passed.");
            return 0;
        } else {
            Console.WriteLine("Some test cases failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class ElementDoubler {
    public static List<int> DoubleElements(List<int> inputList) {
        List<int> doubledList = new List<int>();
        foreach (int item in inputList) {
            doubledList.Add(item * 2);
        }
        return doubledList;
    }
    public static void TestDoubleElements() {
        List<int> sampleList = new List<int>() { 2, 3, 4 };
        List<int> resultList = DoubleElements(sampleList);
        Console.WriteLine("Original list: [" + String.Join(", ", sampleList) + "]");
        Console.WriteLine("Doubled list: [" + String.Join(", ", resultList) + "]");
    }

}

Can you write a C# program that takes a list of integers and returns a new list with each element's value doubled? For instance, if the input list is `[2, 3, 4]`, the output should be `[4, 6, 8]`. The solution should be encapsulated within a method named `DoubleElements` within a class named `ElementDoubler`. The method should accept a list of integers as its parameter and return a new list of integers with doubled values. Also, include a simple method to test the functionality of `DoubleElements` by passing a predefined list of integers and printing the result to the console.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class ElementDoubler
{
    public static List<int> DoubleElements(List<int> inputList) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class TextAnalyzerTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test case 1: Empty list
        if (TextAnalyzer.FindLongestPhrase(new List<string>()) != null)
        {
            Console.WriteLine("Test 1 failed.");
            allTestsPassed = false;
        }

        // Test case 2: List with multiple phrases
        if (TextAnalyzer.FindLongestPhrase(new List<string>{"a", "bb", "ccc"}) != "ccc")
        {
            Console.WriteLine("Test 2 failed.");
            allTestsPassed = false;
        }

        // Test case 3: List with two phrases of the same length
        if (TextAnalyzer.FindLongestPhrase(new List<string>{"hello", "world"}) != "hello")
        {
            Console.WriteLine("Test 3 failed.");
            allTestsPassed = false;
        }

        // Test case 4: List with a longer phrase
        if (TextAnalyzer.FindLongestPhrase(new List<string>{"cat", "elephant", "dog"}) != "elephant")
        {
            Console.WriteLine("Test 4 failed.");
            allTestsPassed = false;
        }

        // Test case 5: List with multiple longer phrases
        if (TextAnalyzer.FindLongestPhrase(new List<string>{"short", "medium", "longest", "longer"}) != "longest")
        {
            Console.WriteLine("Test 5 failed.");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed successfully.");
            return 0;
        }
        else
        {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class TextAnalyzer
{
    public static string FindLongestPhrase(List<string> phrases)
    {
        if (phrases == null || phrases.Count == 0) return null;
        string longestPhrase = phrases[0];
        foreach (var phrase in phrases)
        {
            if (phrase.Length > longestPhrase.Length)
            {
                longestPhrase = phrase;
            }
        }
        return longestPhrase;
    }
    public static void TestFindLongestPhrase()
    {
        Debug.Assert(FindLongestPhrase(new List<string>()) == null);
        Debug.Assert(FindLongestPhrase(new List<string>{"a", "bb", "ccc"}) == "ccc");
        Debug.Assert(FindLongestPhrase(new List<string>{"hello", "world"}) == "hello");
        Debug.Assert(FindLongestPhrase(new List<string>{"cat", "elephant", "dog"}) == "elephant");
        Console.WriteLine("All tests passed successfully.");
    }
}
class Program
{

}

You've been tasked with creating a utility function for a text analysis application. The function needs to sift through a collection of phrases and identify the phrase with the most characters. In cases where the collection is empty, the function should simply return `null` to indicate the absence of any phrases. Moreover, if there exists more than one phrase with the maximum length, the function should return the phrase that appears first in the collection. Your challenge is to implement this functionality efficiently. To ensure the function performs as expected, you'll also need to write a test method that checks the function with various inputs.

Can you design and implement this function?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class TextAnalyzer
{
    public static string FindLongestPhrase(List<string> phrases)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class OddNumberFilterTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test case 1
        var list1 = new List<int> { 2, 3, 4, 5, 6 };
        var expected1 = new List<int> { 3, 5 };
        var result1 = OddNumberFilter.FilterOddNumbers(list1);
        Console.WriteLine($"Test 1 - Passed: {result1.SequenceEqual(expected1)}");
        allTestsPassed &= result1.SequenceEqual(expected1);

        // Test case 2
        var list2 = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        var expected2 = new List<int> { 1, 3, 5, 7, 9 };
        var result2 = OddNumberFilter.FilterOddNumbers(list2);
        Console.WriteLine($"Test 2 - Passed: {result2.SequenceEqual(expected2)}");
        allTestsPassed &= result2.SequenceEqual(expected2);

        // Test case 3
        var list3 = new List<int> { -1, -2, -3, -4, -5 };
        var expected3 = new List<int> { -1, -3, -5 };
        var result3 = OddNumberFilter.FilterOddNumbers(list3);
        Console.WriteLine($"Test 3 - Passed: {result3.SequenceEqual(expected3)}");
        allTestsPassed &= result3.SequenceEqual(expected3);

        // Test case 4
        var list4 = new List<int> { 0, 1, 2, 3, 4, 5 };
        var expected4 = new List<int> { 1, 3, 5 };
        var result4 = OddNumberFilter.FilterOddNumbers(list4);
        Console.WriteLine($"Test 4 - Passed: {result4.SequenceEqual(expected4)}");
        allTestsPassed &= result4.SequenceEqual(expected4);

        return allTestsPassed ? 0 : -1;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class OddNumberFilter
{
    public static List<int> FilterOddNumbers(List<int> numbers)
    {
        return numbers.Where(number => number % 2 != 0).ToList();
    }
    public static void TestFilterOddNumbers()
    {
        var list1 = new List<int> { 2, 3, 4, 5, 6 };
        var expected1 = new List<int> { 3, 5 };
        var result1 = FilterOddNumbers(list1);
        Console.WriteLine($"Test 1 - Passed: {result1.SequenceEqual(expected1)}");
        var list2 = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        var expected2 = new List<int> { 1, 3, 5, 7, 9 };
        var result2 = FilterOddNumbers(list2);
        Console.WriteLine($"Test 2 - Passed: {result2.SequenceEqual(expected2)}");
    }

}

Can you write a method that filters out all the even numbers from a given list and returns only the odd numbers? Make sure your method can handle a list of integers and returns a new list containing only the integers that are odd. For example, if the method is given a list `[2, 3, 4, 5, 6]`, it should return a new list `[3, 5]`. Additionally, include a simple test function that verifies the correctness of your method with a couple of predefined lists.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class OddNumberFilter
{
    public static List<int> FilterOddNumbers(List<int> numbers)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;

#<INSERT>

class RectangleAreaCalculatorTest {
    public static int Main(string[] args) {
        bool allTestsPassed = true;

        // Test Case 1
        if (RectangleAreaCalculator.CalculateRectangleArea(5, 10) != 50) {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        if (RectangleAreaCalculator.CalculateRectangleArea(7, 3) != 21) {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        if (RectangleAreaCalculator.CalculateRectangleArea(9, 9) != 81) {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        if (RectangleAreaCalculator.CalculateRectangleArea(0, 10) != 0) {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        // Test Case 5
        if (RectangleAreaCalculator.CalculateRectangleArea(10, 0) != 0) {
            Console.WriteLine("Test Case 5 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed) {
            Console.WriteLine("All test cases passed successfully.");
            return 0;
        } else {
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
class RectangleAreaCalculator {
    public static int CalculateRectangleArea(int length, int width) {
        return length * width;
    }
    public static void TestCalculateRectangleArea() {
        Debug.Assert(CalculateRectangleArea(5, 10) == 50, "Test Case 1 Failed");
        Debug.Assert(CalculateRectangleArea(7, 3) == 21, "Test Case 2 Failed");
        Debug.Assert(CalculateRectangleArea(9, 9) == 81, "Test Case 3 Failed");
        Console.WriteLine("All test cases passed successfully.");
    }

}

Can you write a C# method that calculates the area of a rectangle? The method should take two parameters: the length and the width of the rectangle, both as integers. It should return the area as an integer. To ensure the method works as expected, please also include a simple test function that verifies the calculation with a few test cases.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class RectangleAreaCalculator
{
    public static int CalculateRectangleArea(int length, int width) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class LetterFrequencyFinderTest
{
    public static void Main(string[] args)
    {
        var testCases = new Dictionary<string, Dictionary<string, long>>()
        {
            { "m n o m", new Dictionary<string, long>{{"m", 2L}} },
            { "x y z x y", new Dictionary<string, long>{{"x", 2L}, {"y", 2L}} },
            { "a b c d e f g", new Dictionary<string, long>{{"a", 1L}, {"b", 1L}, {"c", 1L}, {"d", 1L}, {"e", 1L}, {"f", 1L}, {"g", 1L}} },
            { "", new Dictionary<string, long>() },
            { "a a a b b c", new Dictionary<string, long>{{"a", 3L}} }
        };

        int result = 0;
        foreach (var testCase in testCases)
        {
            var resultDict = LetterFrequencyFinder.FindHighestFrequencyLetters(testCase.Key);
            if (resultDict.SequenceEqual(testCase.Value))
            {
                Console.WriteLine($"Test passed for input: '{testCase.Key}'");
            }
            else
            {
                Console.WriteLine($"Test failed for input: '{testCase.Key}'");
                result = -1;
            }
        }

        Environment.Exit(result);
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class LetterFrequencyFinder
{
    public static Dictionary<string, long> FindHighestFrequencyLetters(string input)
    {
        if (string.IsNullOrWhiteSpace(input)) return new Dictionary<string, long>();
        var letterCounts = input.Replace(" ", "")
                                .GroupBy(letter => letter)
                                .ToDictionary(group => group.Key.ToString(), group => (long)group.Count());
        long maxFrequency = letterCounts.Values.Max();
        return letterCounts.Where(pair => pair.Value == maxFrequency)
                           .ToDictionary(pair => pair.Key, pair => pair.Value);
    }
    public static void CheckMethod()
    {
        var testCases = new Dictionary<string, Dictionary<string, long>>()
        {
            { "m n o m", new Dictionary<string, long>{{"m", 2L}} },
            { "x y z x y", new Dictionary<string, long>{{"x", 2L}, {"y", 2L}} },
            { "", new Dictionary<string, long>() }
        };
        foreach (var testCase in testCases)
        {
            var result = FindHighestFrequencyLetters(testCase.Key);
            if (result.SequenceEqual(testCase.Value))
            {
                Console.WriteLine($"Test passed for input: '{testCase.Key}'");
            }
            else
            {
                Console.WriteLine($"Test failed for input: '{testCase.Key}'");
            }
        }
    }

}

Can you write a C# method that takes a string of lowercase letters separated by spaces and returns a dictionary? This dictionary should contain each unique letter as keys and the number of times they appear as values. However, there's a twist: only include the letters that appear the most in the input string. So, if multiple letters tie for the highest frequency, include all of them in the output. If no letters are present in the input, the method should return an empty dictionary. Here are a few examples to illustrate what I mean:

- If the input is `"m n o m"`, the output should be `new Dictionary<string, long>(){{"m", 2L}}`.
- For `"x y z x y"`, it should return `new Dictionary<string, long>(){{"x", 2L}, {"y", 2L}}`.
- And if the input is an empty string `""`, just return an empty dictionary: `new Dictionary<string, long>()`.

Could you also include a simple way to verify if the method works correctly with these examples?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class LetterFrequencyFinder
{
    public static Dictionary<string, long> FindHighestFrequencyLetters(string input)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class NumberSorterTest {
    public static void Main(string[] args) {
        int result = 0;

        if (NumberSorter.SortWordedNumbers("three one five") != "one three five") {
            Console.WriteLine("Test 1 Failed");
            result = -1;
        }

        if (NumberSorter.SortWordedNumbers("nine eight seven") != "seven eight nine") {
            Console.WriteLine("Test 2 Failed");
            result = -1;
        }

        if (NumberSorter.SortWordedNumbers("two four six") != "two four six") {
            Console.WriteLine("Test 3 Failed");
            result = -1;
        }

        if (NumberSorter.SortWordedNumbers("ten nine eight") != "eight nine ten") {
            Console.WriteLine("Test 4 Failed");
            result = -1;
        }

        if (NumberSorter.SortWordedNumbers("one two three") != "one two three") {
            Console.WriteLine("Test 5 Failed");
            result = -1;
        }

        if (result == 0) {
            Console.WriteLine("All tests passed!");
        }

        Environment.Exit(result);
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class NumberSorter {
    public static string SortWordedNumbers(string numberWords) {
        Dictionary<string, int> numberMapping = new Dictionary<string, int> {
            {"one", 1}, {"two", 2}, {"three", 3}, {"four", 4},
            {"five", 5}, {"six", 6}, {"seven", 7}, {"eight", 8},
            {"nine", 9}, {"ten", 10}
        };
        var sortedNumbers = numberWords.Split(' ')
                                        .Select(word => numberMapping[word])
                                        .OrderBy(num => num)
                                        .Select(num => numberMapping.FirstOrDefault(x => x.Value == num).Key);
        return String.Join(" ", sortedNumbers);
    }
    public static void Check() {
        Debug.Assert(SortWordedNumbers("three one five") == "one three five");
        Debug.Assert(SortWordedNumbers("nine eight seven") == "seven eight nine");
        Debug.Assert(SortWordedNumbers("two four six") == "two four six");
        Console.WriteLine("All checks passed!");
    }

}

Hey, can you help me out? I've got a list of numbers, but they're all written out in words from one to ten, and I need to sort them in ascending order. However, they're all jumbled up in a single string, separated by spaces. For example, if I have the string "six four two", I'd want it back as "two four six". Could you write a C# program that does this for me? It needs to handle any mix of these written numbers and give me back a sorted string with the words in the correct order.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class NumberSorter
{
    public static string SortWordedNumbers(string numberWords) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class UniqueDigitCounterTest
{
    // Tests the CountUniqueDigits method with provided data points.
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test Case 1
        if (UniqueDigitCounter.CountUniqueDigits("Hello123") != 3)
        {
            Console.WriteLine("Test 1 Failed");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 1 Passed");
        }

        // Test Case 2
        if (UniqueDigitCounter.CountUniqueDigits("NoDigitsHere!") != 0)
        {
            Console.WriteLine("Test 2 Failed");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 2 Passed");
        }

        // Test Case 3
        if (UniqueDigitCounter.CountUniqueDigits("123321") != 3)
        {
            Console.WriteLine("Test 3 Failed");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 3 Passed");
        }

        // Test Case 4
        if (UniqueDigitCounter.CountUniqueDigits("A1B2C3D4E5F6G7H8I9J0") != 10)
        {
            Console.WriteLine("Test 4 Failed");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 4 Passed");
        }

        if (allTestsPassed)
        {
            return 0;
        }
        else
        {
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class UniqueDigitCounter
{
    public static int CountUniqueDigits(string str)
    {
        HashSet<char> uniqueDigits = new HashSet<char>();
        foreach (char ch in str)
        {
            if (char.IsDigit(ch))
            {
                uniqueDigits.Add(ch);
            }
        }
        return uniqueDigits.Count;
    }
    public static void TestCountUniqueDigits()
    {
        Console.WriteLine(CountUniqueDigits("Hello123") == 3 ? "Test 1 Passed" : "Test 1 Failed");
        Console.WriteLine(CountUniqueDigits("NoDigitsHere!") == 0 ? "Test 2 Passed" : "Test 2 Failed");
        Console.WriteLine(CountUniqueDigits("123321") == 3 ? "Test 3 Passed" : "Test 3 Failed");
        Console.WriteLine(CountUniqueDigits("A1B2C3D4E5F6G7H8I9J0") == 10 ? "Test 4 Passed" : "Test 4 Failed");
    }

}

Can you write a C# program that calculates the number of unique digits in a given alphanumeric string? For instance, if the input string is "Hello123", the program should count the distinct digits, which are "1", "2", and "3", resulting in an output of 3. The program should ignore letters and special characters, focusing only on digits. Ensure your solution includes a method to perform this calculation and a separate method to test its correctness with given examples.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class UniqueDigitCounter
{
    public static int CountUniqueDigits(string str)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class EvenNumbersExtractorTest
{
    public static int Main(string[] args)
    {
        var testCases = new Dictionary<List<int>, List<int>>
        {
            { new List<int>{ 1, 2, 3, 4, 5 }, new List<int>{ 2, 4 } },
            { new List<int>{ 10, 23, 36, 47, 58 }, new List<int>{ 10, 36, 58 } },
            { new List<int>{ -2, -1, 0, 1, 2 }, new List<int>{ -2, 0, 2 } },
            { new List<int>{ 1, 3, 5, 7, 9 }, new List<int>{ } },
            { new List<int>{ 2, 4, 6, 8, 10 }, new List<int>{ 2, 4, 6, 8, 10 } }
        };

        foreach (var testCase in testCases)
        {
            var input = testCase.Key;
            var expectedOutput = testCase.Value;
            var actualOutput = EvenNumbersExtractor.ExtractEvenNumbers(input);

            if (!expectedOutput.SequenceEqual(actualOutput))
            {
                Console.WriteLine($"Test Failed for Input: {string.Join(", ", input)}");
                Console.WriteLine($"Expected Output: {string.Join(", ", expectedOutput)}");
                Console.WriteLine($"Actual Output: {string.Join(", ", actualOutput)}");
                return -1;
            }
        }

        Console.WriteLine("All tests passed.");
        return 0;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class EvenNumbersExtractor
{
    public static List<int> ExtractEvenNumbers(List<int> numbers)
    {
        return numbers.Where(number => number % 2 == 0).ToList();
    }
    public static void TestExtractEvenNumbers()
    {
        var testCases = new Dictionary<List<int>, List<int>>
        {
            { new List<int>{ 1, 2, 3, 4, 5 }, new List<int>{ 2, 4 } },
            { new List<int>{ 10, 23, 36, 47, 58 }, new List<int>{ 10, 36, 58 } },
            { new List<int>{ -2, -1, 0, 1, 2 }, new List<int>{ -2, 0, 2 } }
        };
        foreach (var testCase in testCases)
        {
            var input = testCase.Key;
            var expectedOutput = testCase.Value;
            var actualOutput = ExtractEvenNumbers(input);
            Console.WriteLine($"Input: {string.Join(", ", input)}");
            Console.WriteLine($"Expected Output: {string.Join(", ", expectedOutput)}");
            Console.WriteLine($"Actual Output: {string.Join(", ", actualOutput)}");
            Console.WriteLine($"Test Passed: {expectedOutput.SequenceEqual(actualOutput)}\n");
        }
    }

}

Hey there, I was working on a C# program for a project where I needed to extract and list all the even numbers from a given list of integers. Unfortunately, I'm a bit stuck and could use your help to get it right. Can you write a C# method that takes a list of integers as input and returns a new list containing only the even numbers? For example, if I pass in a list containing the numbers 1, 2, 3, 4, and 5, I should get back a list containing just 2 and 4. It would be great if you could also include a simple way to test the method with a few different lists to ensure it's working correctly. Thanks!

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class EvenNumbersExtractor
{
    public static List<int> ExtractEvenNumbers(List<int> numbers)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class SquaredOddsSorterTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test Case 1
        var list1 = new List<int> { 1, 2, 3, 4, 5 };
        var expected1 = new List<int> { 25, 9, 1 };
        if (!SquaredOddsSorter.FilterSquareSortDesc(list1).SequenceEqual(expected1))
        {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        var list2 = new List<int> { -3, -2, -1, 0, 4, 6 };
        var expected2 = new List<int> { 9, 1 };
        if (!SquaredOddsSorter.FilterSquareSortDesc(list2).SequenceEqual(expected2))
        {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        var list3 = new List<int> { -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 };
        var expected3 = new List<int> { 25, 25, 9, 9, 1, 1 };
        if (!SquaredOddsSorter.FilterSquareSortDesc(list3).SequenceEqual(expected3))
        {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        var list4 = new List<int> { 2, 4, 6, 8 };
        var expected4 = new List<int> { };
        if (!SquaredOddsSorter.FilterSquareSortDesc(list4).SequenceEqual(expected4))
        {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        // Test Case 5
        var list5 = new List<int> { 1, 3, 5, 7, 9 };
        var expected5 = new List<int> { 81, 49, 25, 9, 1 };
        if (!SquaredOddsSorter.FilterSquareSortDesc(list5).SequenceEqual(expected5))
        {
            Console.WriteLine("Test Case 5 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed.");
            return 0;
        }
        else
        {
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class SquaredOddsSorter
{
    public static List<int> FilterSquareSortDesc(List<int> numbers)
    {
        return numbers.Where(num => num % 2 != 0)
                      .Select(num => num * num)
                      .OrderByDescending(num => num)
                      .ToList();
    }
    public static void Check()
    {
        var list1 = new List<int> { 1, 2, 3, 4, 5 };
        var expected1 = new List<int> { 25, 9, 1 };
        Debug.Assert(FilterSquareSortDesc(list1).SequenceEqual(expected1));
        var list2 = new List<int> { -3, -2, -1, 0, 4, 6 };
        var expected2 = new List<int> { 9, 1 };
        Debug.Assert(FilterSquareSortDesc(list2).SequenceEqual(expected2));
        Console.WriteLine("All tests passed.");
    }

}

Can you write a method that takes a collection of integers, filters out the even numbers, squares the remaining odd numbers, and then returns a list of these squared numbers sorted in descending order? Ensure that your solution is a self-contained C# program that includes all necessary imports. The program should handle a list of integers, which might include both positive and negative numbers. Duplicate numbers should be squared and sorted just like any other number in the list. For example, if the input list is `[1, 2, 3, 4, 5]`, the output should be `[25, 9, 1]` since 1, 3, and 5 are odd, squared, and then sorted in descending order.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class SquaredOddsSorter
{
    public static List<int> FilterSquareSortDesc(List<int> numbers)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class StringMergerTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test Case 1
        allTestsPassed &= StringMerger.MergeToUpper(new List<string> { "h", "e", "l", "l", "o" }) == "HELLO";
        // Test Case 2
        allTestsPassed &= StringMerger.MergeToUpper(new List<string> { "w", "o", "r", "l", "d" }) == "WORLD";
        // Test Case 3
        allTestsPassed &= StringMerger.MergeToUpper(new List<string> { "a", "b", "c" }) == "ABC";
        // Test Case 4
        allTestsPassed &= StringMerger.MergeToUpper(new List<string> { "1", "2", "3" }) == "123";

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed.");
            return 0;
        }
        else
        {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class StringMerger
{
    public static string MergeToUpper(List<string> characters)
    {
        return string.Concat(characters.Select(c => c.ToUpper()));
    }
    public static void TestMergeToUpper()
    {
        Console.WriteLine(MergeToUpper(new List<string> { "h", "e", "l", "l", "o" }) == "HELLO" ? "Test 1 Passed" : "Test 1 Failed");
        Console.WriteLine(MergeToUpper(new List<string> { "w", "o", "r", "l", "d" }) == "WORLD" ? "Test 2 Passed" : "Test 2 Failed");
    }
}
class Program
{

}

Suppose you're working on a project that involves manipulating lists of strings for a new text processing application. Your current task is to develop a function that merges a list of individual characters into a single word. However, there's a twist: you need to ensure that each character is converted to uppercase before being concatenated. For instance, if the input list contains the characters ['h', 'e', 'l', 'l', 'o'], the output should be 'HELLO'.

Can you write a C# function that takes a list of single-character strings as input and returns a single string, where each character is in uppercase and concatenated without spaces in between? Additionally, make sure to include a simple way to test your function with a couple of examples to demonstrate its correctness.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class StringMerger
{
    public static string MergeToUpper(List<string> characters)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class StringCombinerTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test Case 1: Empty list
        List<string> test1Input = new List<string>();
        string test1Expected = "";
        string test1Result = StringCombiner.JoinWithSpaces(test1Input);
        if (test1Result != test1Expected)
        {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2: List with multiple words
        List<string> test2Input = new List<string> { "Hello", "world", "!" };
        string test2Expected = "Hello world !";
        string test2Result = StringCombiner.JoinWithSpaces(test2Input);
        if (test2Result != test2Expected)
        {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3: List with multiple words
        List<string> test3Input = new List<string> { "Quick", "brown", "fox" };
        string test3Expected = "Quick brown fox";
        string test3Result = StringCombiner.JoinWithSpaces(test3Input);
        if (test3Result != test3Expected)
        {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4: List with a single word
        List<string> test4Input = new List<string> { "SingleWord" };
        string test4Expected = "SingleWord";
        string test4Result = StringCombiner.JoinWithSpaces(test4Input);
        if (test4Result != test4Expected)
        {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        // Test Case 5: List with multiple words
        List<string> test5Input = new List<string> { "A", "B", "C", "D" };
        string test5Expected = "A B C D";
        string test5Result = StringCombiner.JoinWithSpaces(test5Input);
        if (test5Result != test5Expected)
        {
            Console.WriteLine("Test Case 5 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed successfully.");
            return 0;
        }
        else
        {
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class StringCombiner
{
    public static string JoinWithSpaces(List<string> words)
    {
        return string.Join(" ", words);
    }
    )) == "Hello world !");
        Debug.Assert(JoinWithSpaces(new List<string>(new string[] { "Quick", "brown", "fox" })) == "Quick brown fox");
        Console.WriteLine("All tests passed successfully.");
    }
}

Hey there! I'm working on a project where I need to combine a bunch of words together, but with a twist. I want to not only join these words but also add a space between each word. Can you help me out by writing a C# program that does this? For example, if I provide a list of words like "Hello", "world", and "!", it should give me back "Hello world !". It's essential that the program can handle any list of words I throw at it, including an empty list, which should just return an empty string. Oh, and let's make sure we're using the latest and greatest practices, so include necessary imports and make the code as neat as possible!

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class StringCombiner
{
    public static string JoinWithSpaces(List<string> words)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class CharacterFrequencyAnalyzerTest
{
    static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test case 1
        Dictionary<char, int> result1 = CharacterFrequencyAnalyzer.MostFrequentChars("a b c a");
        Dictionary<char, int> expected1 = new Dictionary<char, int> { { 'a', 2 } };
        allTestsPassed &= DictionaryComparer(result1, expected1);

        // Test case 2
        Dictionary<char, int> result2 = CharacterFrequencyAnalyzer.MostFrequentChars("d e f d e");
        Dictionary<char, int> expected2 = new Dictionary<char, int> { { 'd', 2 }, { 'e', 2 } };
        allTestsPassed &= DictionaryComparer(result2, expected2);

        // Test case 3
        Dictionary<char, int> result3 = CharacterFrequencyAnalyzer.MostFrequentChars("g h i");
        Dictionary<char, int> expected3 = new Dictionary<char, int> { { 'g', 1 }, { 'h', 1 }, { 'i', 1 } };
        allTestsPassed &= DictionaryComparer(result3, expected3);

        // Test case 4
        Dictionary<char, int> result4 = CharacterFrequencyAnalyzer.MostFrequentChars("x y z x y");
        Dictionary<char, int> expected4 = new Dictionary<char, int> { { 'x', 2 }, { 'y', 2 } };
        allTestsPassed &= DictionaryComparer(result4, expected4);

        // Test case 5
        Dictionary<char, int> result5 = CharacterFrequencyAnalyzer.MostFrequentChars("");
        Dictionary<char, int> expected5 = new Dictionary<char, int>();
        allTestsPassed &= DictionaryComparer(result5, expected5);

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed.");
            return 0;
        }
        else
        {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }

    static bool DictionaryComparer(Dictionary<char, int> dict1, Dictionary<char, int> dict2)
    {
        if (dict1.Count != dict2.Count) return false;
        foreach (var pair in dict1)
        {
            if (!dict2.ContainsKey(pair.Key) || dict2[pair.Key] != pair.Value)
            {
                return false;
            }
        }
        return true;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class CharacterFrequencyAnalyzer
{
    public static Dictionary<char, int> MostFrequentChars(string input)
    {
        Dictionary<char, int> charCount = new Dictionary<char, int>();
        Dictionary<char, int> result = new Dictionary<char, int>();
        int highestCount = 0;
        foreach (char c in input)
        {
            if (c != ' ')
            {
                if (!charCount.ContainsKey(c))
                {
                    charCount[c] = 0;
                }
                charCount[c]++;
                highestCount = Math.Max(highestCount, charCount[c]);
            }
        }
        foreach (KeyValuePair<char, int> pair in charCount)
        {
            if (pair.Value == highestCount)
            {
                result.Add(pair.Key, pair.Value);
            }
        }
        return result;
    }
     });
        TestFunction("d e f d e", new Dictionary<char, int> { { 'd', 2 }, { 'e', 2 } });
        TestFunction("g h i", new Dictionary<char, int> { { 'g', 1 }, { 'h', 1 }, { 'i', 1 } });
    }
    static void TestFunction(string input, Dictionary<char, int> expectedOutput)
    {
        var result = MostFrequentChars(input);
        if (result.Count == expectedOutput.Count && !DictionaryComparer(result, expectedOutput))
        {
            Console.WriteLine($"Test failed for input: {input}");
        }
        else
        {
            Console.WriteLine($"Test passed for input: {input}");
        }
    }
    static bool DictionaryComparer(Dictionary<char, int> dict1, Dictionary<char, int> dict2)
    {
        foreach (var pair in dict1)
        {
            if (!dict2.ContainsKey(pair.Key) || dict2[pair.Key] != pair.Value)
            {
                return false;
            }
        }
        return true;
    }
}

Imagine you're working on a text analysis tool and you need to find out which characters (excluding spaces) appear most frequently in a given string. Your task is to write a C# program that takes a string of lowercase letters separated by spaces and returns a dictionary. This dictionary should contain the characters with the highest frequency of appearance and their respective counts. If multiple characters share the highest frequency, the dictionary should include all of them.

For example:
- If the input is "m n o m", your program should return a dictionary with entries {"m", 2}.
- For the input "x y z x y", it should return {"x", 2}, {"y", 2}.
- And for "a a a b", it should return {"a", 3}.

Make sure your solution is self-contained and imports all necessary packages. Also, include a function to verify the correctness of your solution with the provided data points.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class CharacterFrequencyAnalyzer
{
    public static Dictionary<char, int> MostFrequentChars(string input)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class ScoreNormalizerTest
{
    static void Main(string[] args)
    {
        int result = RunTests();
        Environment.Exit(result);
    }

    static int RunTests()
    {
        List<int> input1 = new List<int> { 10, 20, 30, 40, 50 };
        List<int> expected1 = new List<int> { 0, 25, 50, 75, 100 };
        if (!ScoreNormalizer.NormalizeScores(input1).SequenceEqual(expected1))
        {
            Console.WriteLine("Test 1 Failed");
            return -1;
        }

        List<int> input2 = new List<int> { 5, 10, 15, 20, 25 };
        List<int> expected2 = new List<int> { 0, 25, 50, 75, 100 };
        if (!ScoreNormalizer.NormalizeScores(input2).SequenceEqual(expected2))
        {
            Console.WriteLine("Test 2 Failed");
            return -1;
        }

        List<int> input3 = new List<int> { 100, 200, 300, 400, 500 };
        List<int> expected3 = new List<int> { 0, 25, 50, 75, 100 };
        if (!ScoreNormalizer.NormalizeScores(input3).SequenceEqual(expected3))
        {
            Console.WriteLine("Test 3 Failed");
            return -1;
        }

        List<int> input4 = new List<int> { 1, 2, 3, 4, 5 };
        List<int> expected4 = new List<int> { 0, 25, 50, 75, 100 };
        if (!ScoreNormalizer.NormalizeScores(input4).SequenceEqual(expected4))
        {
            Console.WriteLine("Test 4 Failed");
            return -1;
        }

        Console.WriteLine("All tests passed.");
        return 0;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class ScoreNormalizer
{
    public static List<int> NormalizeScores(List<int> scores)
    {
        if (scores == null || scores.Count < 2)
        {
            throw new ArgumentException("Scores list must contain at least two elements.");
        }
        int minScore = scores.Min();
        int maxScore = scores.Max();
        int range = maxScore - minScore;
        List<int> normalizedScores = scores.Select(score =>
            (int)(((score - minScore) / (float)range) * 100)).ToList();
        return normalizedScores;
    }
    ;
        List<int> normalizedScores = NormalizeScores(testScores);
        Console.WriteLine("Normalized Scores: " + String.Join(", ", normalizedScores));
        CheckFunction();
    }
    static void CheckFunction()
    {
        List<int> inputScores = new List<int> { 10, 20, 30, 40, 50 };
        List<int> expectedOutput = new List<int> { 0, 25, 50, 75, 100 };
        List<int> actualOutput = NormalizeScores(inputScores);
        if (actualOutput.SequenceEqual(expectedOutput))
        {
            Console.WriteLine("The normalization function works correctly.");
        }
        else
        {
            Console.WriteLine("There is an issue with the normalization function.");
        }
    }
}

Imagine you have a collection of scores from a game, and you want to normalize these scores so they range from 0 to 100, where the lowest score in your collection becomes 0 and the highest score becomes 100. This way, you can easily compare scores from different games regardless of their original scoring systems. Can you write a C# method that takes a list of integers representing game scores and returns a new list of integers where each score has been normalized to this 0 to 100 scale?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class ScoreNormalizer
{
    public static List<int> NormalizeScores(List<int> scores)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class UniqueIDProcessorTest
{
    public static int Main(string[] args)
    {
        var testCases = new Dictionary<List<int>, List<int>>()
        {
            { new List<int>{1, 2, 3, 2, 4}, new List<int>{1, 2, 3, 4} },
            { new List<int>{5, 5, 6, 7, 8, 8}, new List<int>{5, 6, 7, 8} },
            { new List<int>{9, 10, 11, 12, 12, 12, 13}, new List<int>{9, 10, 11, 12, 13} },
            { new List<int>{1, 1, 1, 1}, new List<int>{1} },
            { new List<int>{}, new List<int>{} }
        };

        int testResult = 0;

        foreach (var testCase in testCases)
        {
            var output = UniqueIDProcessor.FilterUniqueIDs(testCase.Key);
            if (Enumerable.SequenceEqual(output, testCase.Value))
            {
                Console.WriteLine("Test Passed");
            }
            else
            {
                Console.WriteLine("Test Failed");
                testResult = -1;
            }
        }

        return testResult;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class UniqueIDProcessor
{
    public static List<int> FilterUniqueIDs(List<int> userIds)
    {
        HashSet<int> seen = new HashSet<int>();
        List<int> result = new List<int>();
        foreach (var id in userIds)
        {
            if (!seen.Contains(id))
            {
                result.Add(id);
                seen.Add(id);
            }
        }
        return result;
    }
    public static void Check()
    {
        var testCases = new Dictionary<List<int>, List<int>>()
        {
            { new List<int>{1, 2, 3, 2, 4}, new List<int>{1, 3, 4} },
            { new List<int>{5, 5, 6, 7, 8, 8}, new List<int>{5, 6, 7, 8} },
            { new List<int>{9, 10, 11, 12, 12, 12, 13}, new List<int>{9, 10, 11, 12, 13} }
        };
        foreach (var testCase in testCases)
        {
            var output = FilterUniqueIDs(testCase.Key);
            if (Enumerable.SequenceEqual(output, testCase.Value))
            {
                Console.WriteLine("Test Passed");
            }
            else
            {
                Console.WriteLine("Test Failed");
            }
        }
    }

}

Imagine you're working on a project where you need to process a list of user IDs represented as integers. However, due to some bugs in the data collection process, some IDs have been duplicated. Your task is to write a C# method that takes a list of these IDs and returns a new list with all duplicates removed. Importantly, the original order of the unique IDs in the list must be preserved. Can you design a method to efficiently solve this problem?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class UniqueIDProcessor
{
    public static List<int> FilterUniqueIDs(List<int> userIds)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;

#<INSERT>

class DataAnalyzerTest
{
    public static int Main()
    {
        bool allTestsPassed = true;

        // Test Case 1
        int result1 = DataAnalyzer.FindDescendingIndex(new int[]{5, 7, 10, 6, 12});
        if (result1 != 3)
        {
            Console.WriteLine("Test 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        int result2 = DataAnalyzer.FindDescendingIndex(new int[]{1, 2, 3});
        if (result2 != -1)
        {
            Console.WriteLine("Test 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        int result3 = DataAnalyzer.FindDescendingIndex(new int[]{});
        if (result3 != -1)
        {
            Console.WriteLine("Test 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        int result4 = DataAnalyzer.FindDescendingIndex(new int[]{10, 9, 8, 7, 6, 5});
        if (result4 != 5)
        {
            Console.WriteLine("Test 4 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed.");
            return 0;
        }
        else
        {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
class DataAnalyzer
{
    public static int FindDescendingIndex(int[] numbers)
    {
        if (numbers.Length == 0) return -1;
        for (int i = numbers.Length - 1; i > 0; i--)
        {
            if (numbers[i] < numbers[i - 1])
            {
                return i;
            }
        }
        return -1;
    }
    public static void Check()
    {
        Console.WriteLine(FindDescendingIndex(new int[]{5, 7, 10, 6, 12}) == 3 ? "Test 1 Passed" : "Test 1 Failed");
        Console.WriteLine(FindDescendingIndex(new int[]{1, 2, 3}) == -1 ? "Test 2 Passed" : "Test 2 Failed");
        Console.WriteLine(FindDescendingIndex(new int[]{}) == -1 ? "Test 3 Passed" : "Test 3 Failed");
        Console.WriteLine(FindDescendingIndex(new int[]{10, 9, 8, 7, 6, 5}) == 5 ? "Test 4 Passed" : "Test 4 Failed");
    }
}
class Program
{

}

Imagine you're working on a data analysis tool and you need to find a specific pattern in your dataset. Specifically, you're looking for the last position where a number is smaller than the number that comes before it in a list of unique numbers. Write a C# method that takes an array of integers as input and returns the index of the last element that is smaller than its predecessor. If all elements are in ascending order or the array is empty, the method should return -1. Remember, the array will not contain any duplicate values.

For example, if the input array is `[5, 7, 10, 6, 12]`, the method should return `3` because the element at index 3 (which is `6`) is smaller than the element at index 2 (which is `10`). If the input array is `[1, 2, 3]`, the method should return `-1` since there is no element that is smaller than its predecessor.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class DataAnalyzer
{
    public static int FindDescendingIndex(int[] numbers)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;

#<INSERT>

class FinancialCalculatorTest {
    public static void RunTests() {
        bool allTestsPassed = true;

        // Test case 1
        allTestsPassed &= FinancialCalculator.RoundAwayFromZero("10") == 10;
        // Test case 2
        allTestsPassed &= FinancialCalculator.RoundAwayFromZero("15.3") == 15;
        // Test case 3
        allTestsPassed &= FinancialCalculator.RoundAwayFromZero("14.5") == 15;
        // Test case 4
        allTestsPassed &= FinancialCalculator.RoundAwayFromZero("-14.5") == -15;
        // Test case 5
        allTestsPassed &= FinancialCalculator.RoundAwayFromZero("-14.4") == -14;

        if (allTestsPassed) {
            Console.WriteLine("All tests passed.");
            Environment.Exit(0);
        } else {
            Console.WriteLine("Some tests failed.");
            Environment.Exit(-1);
        }
    }

    static void Main(string[] args) {
        RunTests();
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
class FinancialCalculator {
    public static long RoundAwayFromZero(string valueStr) {
        decimal value = decimal.Parse(valueStr);
        decimal fractionPart = value % 1;
        if (value > 0) {
            return fractionPart >= 0.5m ? (long)Math.Ceiling(value) : (long)Math.Floor(value);
        } else {
            return fractionPart <= -0.5m ? (long)Math.Floor(value) : (long)Math.Ceiling(value);
        }
    }
    public static void Check() {
        Console.WriteLine(RoundAwayFromZero("10") == 10 ? "Pass" : "Fail");
        Console.WriteLine(RoundAwayFromZero("15.3") == 15 ? "Pass" : "Fail");
        Console.WriteLine(RoundAwayFromZero("14.5") == 15 ? "Pass" : "Fail");
        Console.WriteLine(RoundAwayFromZero("-14.5") == -15 ? "Pass" : "Fail");
    }
}
class Program {

}

Imagine you're working on a financial application where precision is key, and you need to implement a feature that deals with user inputs in the form of strings representing monetary values. Your task is to write a method that takes these string representations, converts them to numbers, and then rounds them to the nearest whole number. However, there's a twist: if the number is exactly halfway between two integers, you should always round it in a direction away from zero. This means, for example, that both "3.5" and "-3.5" should be rounded to "4" and "-4" respectively, instead of the usual rounding rules. Can you write a C# method that accomplishes this?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class FinancialCalculator
{
    public static long RoundAwayFromZero(string valueStr) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;

#<INSERT>

class TimeRotatorTest {
    public static void Main(string[] args) {
        int result = 0;

        // Test case 1
        string result1 = TimeRotator.RotateTime(1230, 2);
        if (result1 != "3012") {
            Console.WriteLine($"Test 1 Failed: Expected 3012, Got {result1}");
            result = -1;
        }

        // Test case 2
        string result2 = TimeRotator.RotateTime(1230, 5);
        if (result2 != "0321") {
            Console.WriteLine($"Test 2 Failed: Expected 0321, Got {result2}");
            result = -1;
        }

        // Test case 3
        string result3 = TimeRotator.RotateTime(9075, 3);
        if (result3 != "5907") {
            Console.WriteLine($"Test 3 Failed: Expected 5907, Got {result3}");
            result = -1;
        }

        // Test case 4
        string result4 = TimeRotator.RotateTime(9075, 4);
        if (result4 != "9075") {
            Console.WriteLine($"Test 4 Failed: Expected 9075, Got {result4}");
            result = -1;
        }

        // Test case 5
        string result5 = TimeRotator.RotateTime(1001, 1);
        if (result5 != "0011") {
            Console.WriteLine($"Test 5 Failed: Expected 0011, Got {result5}");
            result = -1;
        }

        if (result == 0) {
            Console.WriteLine("All tests passed!");
        }

        Environment.Exit(result);
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
class TimeRotator {
    public static string RotateTime(int time, int positions) {
        string timeStr = time.ToString("D4");
        if (positions > 4) {
            char[] timeChars = timeStr.ToCharArray();
            Array.Reverse(timeChars);
            return new string(timeChars);
        } else {
            string rotatedTime = timeStr.Substring(positions) + timeStr.Substring(0, positions);
            return rotatedTime;
        }
    }
    public static void Check() {
        Debug.Assert(RotateTime(1230, 2) == "3012");
        Debug.Assert(RotateTime(1230, 5) == "0321");
        Debug.Assert(RotateTime(9075, 3) == "5907");
        Debug.Assert(RotateTime(9075, 4) == "9075");
        Console.WriteLine("All checks passed!");
    }

}

Imagine you're working on a digital clock application that needs a unique feature: rotating the time display. You want to create a function that takes a time in the format of HHMM (as an integer) and rotates the digits to the left by a specified number of positions. If the number of positions to rotate exceeds the length of the time (4 digits), the function should simply return the original time in reverse order. For example, if the input time is 1230 and you rotate it by 2 positions, the output should be 3012. If you rotate it by 5 positions, since 5 is greater than 4, the output should be 0321 (the reverse of 1230).

Write a C# function that implements this feature. Ensure your code is self-contained and imports any necessary packages at the beginning. Also, include a check function with provided data points to verify the correctness of your solution.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class TimeRotator
{
    public static string RotateTime(int time, int positions) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class DataProcessorTest
{
    public static int Main()
    {
        var testCases = new Dictionary<List<int>, List<int>>
        {
            { new List<int> { 1, 2, 3 }, new List<int> { 2, 4, 6 } },
            { new List<int> { 5, 0, -1 }, new List<int> { 10, 0, -2 } },
            { new List<int> { }, new List<int> { } },
            { new List<int> { -10, 15, 20 }, new List<int> { -20, 30, 40 } },
            { new List<int> { 100, 200, 300 }, new List<int> { 200, 400, 600 } }
        };

        int testResults = 0;

        foreach (var testCase in testCases)
        {
            var result = DataProcessor.DoubleElements(testCase.Key);
            var expectedResult = testCase.Value;
            Console.WriteLine($"Input: [{string.Join(", ", testCase.Key)}]");
            Console.WriteLine($"Expected Output: [{string.Join(", ", expectedResult)}]");
            Console.WriteLine($"Actual Output: [{string.Join(", ", result)}]");
            if (!result.SequenceEqual(expectedResult))
            {
                Console.WriteLine("Test Failed");
                testResults = -1;
            }
            else
            {
                Console.WriteLine("Test Passed");
            }
            Console.WriteLine();
        }

        return testResults;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class DataProcessor
{
    public static List<int> DoubleElements(List<int> numbers)
    {
        List<int> doubledNumbers = new List<int>();
        foreach (int number in numbers)
        {
            doubledNumbers.Add(number * 2);
        }
        return doubledNumbers;
    }
    public static void Check()
    {
        var testCases = new Dictionary<List<int>, List<int>>
        {
            { new List<int> { 1, 2, 3 }, new List<int> { 2, 4, 6 } },
            { new List<int> { 5, 0, -1 }, new List<int> { 10, 0, -2 } },
            { new List<int> { }, new List<int> { } }
        };
        foreach (var testCase in testCases)
        {
            var result = DoubleElements(testCase.Key);
            var expectedResult = testCase.Value;
            Console.WriteLine($"Input: [{string.Join(", ", testCase.Key)}]");
            Console.WriteLine($"Expected Output: [{string.Join(", ", expectedResult)}]");
            Console.WriteLine($"Actual Output: [{string.Join(", ", result)}]");
            Console.WriteLine(result.SequenceEqual(expectedResult) ? "Test Passed" : "Test Failed");
            Console.WriteLine();
        }
    }
}
class Program
{

}

Imagine you're writing a method in C# that takes a list of integers and returns a new list with each element's value doubled. For example, if the input list is `[1, 2, 3]`, the output should be `[2, 4, 6]`. Write a method that performs this operation.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class DataProcessor
{
    public static List<int> DoubleElements(List<int> numbers)
    {
        // Implement your code here.
    }
}
```


using System;

#<INSERT>

public class FinancialHelperTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test case 1: Regular amount with cents
        if (FinancialHelper.ExtractCents(123.456m) != 0.456m)
        {
            Console.WriteLine("Test case 1 failed.");
            allTestsPassed = false;
        }

        // Test case 2: Amount with no cents
        if (FinancialHelper.ExtractCents(100m) != 0m)
        {
            Console.WriteLine("Test case 2 failed.");
            allTestsPassed = false;
        }

        // Test case 3: Small amount with cents
        if (FinancialHelper.ExtractCents(0.99m) != 0.99m)
        {
            Console.WriteLine("Test case 3 failed.");
            allTestsPassed = false;
        }

        // Test case 4: Negative amount with cents
        if (FinancialHelper.ExtractCents(-123.456m) != -0.456m)
        {
            Console.WriteLine("Test case 4 failed.");
            allTestsPassed = false;
        }

        // Test case 5: Large amount with cents
        if (FinancialHelper.ExtractCents(987654321.123m) != 0.123m)
        {
            Console.WriteLine("Test case 5 failed.");
            allTestsPassed = false;
        }

        // Return 0 if all tests passed, -1 otherwise
        return allTestsPassed ? 0 : -1;
    }
}

using System;

public class FinancialHelper
{
    public static decimal ExtractCents(decimal amount)
    {
        // Get the fractional part by subtracting the integer part from the original amount
        decimal fractionalPart = amount - Math.Floor(amount);

        // Return the fractional part
        return fractionalPart;
    }
}

Imagine you're working on a financial application where precision is key. You're tasked with writing a method that takes a floating-point number representing a monetary value and extracts just the cents part of that amount. For example, if you have $123.456, you want to isolate and return the 0.456 part. How would you design a method in C# to accomplish this, ensuring it's clear, concise, and efficient?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class FinancialHelper
{
public class FinancialHelper
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;

#<INSERT>

class ScoreAnalyzerTest
{
    public static int Main(string[] args)
    {
        var testCases = new List<Tuple<List<int>, int?>>()
        {
            Tuple.Create(new List<int> { 10, 20, 20, 30, 40, 40 }, 30 as int?),
            Tuple.Create(new List<int> { 5, 5, 5, 5 }, null as int?),
            Tuple.Create(new List<int> { 100, 100, 90 }, 90 as int?),
            Tuple.Create(new List<int> { 1 }, null as int?),
            Tuple.Create(new List<int> { 3, 1, 2 }, 2 as int?)
        };

        foreach (var testCase in testCases)
        {
            var result = ScoreAnalyzer.FindRunnerUpScore(testCase.Item1);
            if (result != testCase.Item2)
            {
                Console.WriteLine($"Test failed for input {string.Join(", ", testCase.Item1)}: Expected {testCase.Item2}, but got {result}");
                return -1;
            }
        }

        Console.WriteLine("All tests passed.");
        return 0;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
using System.Linq;
class ScoreAnalyzer
{
    public static int? FindRunnerUpScore(List<int> scores)
    {
        var runnerUpScore = scores.Distinct().OrderByDescending(score => score).Skip(1).FirstOrDefault();
        if (scores.Distinct().Count() < 2)
        {
            return null;
        }
        return runnerUpScore;
    }
    ;
        var runnerUp = FindRunnerUpScore(scores);
        Console.WriteLine(runnerUp.HasValue ? runnerUp.ToString() : "No runner-up score found.");
    }
}

Imagine you're working on a project that involves a lot of data analysis, and you come across a situation where you need to find the runner-up score from a list of scores. You decide to write a function that can handle this task efficiently. Your function should take a list of integers representing scores and return the second highest score in the list. If the list doesn't have enough unique scores to determine a runner-up, your function should return `None` to indicate that. Can you write a function in C# that accomplishes this?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class ScoreAnalyzer
{
    public static int? FindRunnerUpScore(List<int> scores)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class DataAnalyzerTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test Case 1
        List<int> input1 = new List<int> { 4, 2, 5, 1, 3 };
        List<int> expected1 = new List<int> { 4, 2, 2, 1, 1 };
        List<int> result1 = DataAnalyzer.CumulativeMin(input1);
        if (!result1.SequenceEqual(expected1))
        {
            Console.WriteLine("Test Case 1 Failed");
            allTestsPassed = false;
        }

        // Test Case 2
        List<int> input2 = new List<int> { 1, 1, 1, 1, 1 };
        List<int> expected2 = new List<int> { 1, 1, 1, 1, 1 };
        List<int> result2 = DataAnalyzer.CumulativeMin(input2);
        if (!result2.SequenceEqual(expected2))
        {
            Console.WriteLine("Test Case 2 Failed");
            allTestsPassed = false;
        }

        // Test Case 3
        List<int> input3 = new List<int> { 5, 4, 3, 2, 1 };
        List<int> expected3 = new List<int> { 5, 4, 3, 2, 1 };
        List<int> result3 = DataAnalyzer.CumulativeMin(input3);
        if (!result3.SequenceEqual(expected3))
        {
            Console.WriteLine("Test Case 3 Failed");
            allTestsPassed = false;
        }

        // Test Case 4
        List<int> input4 = new List<int> { 1, 2, 3, 4, 5 };
        List<int> expected4 = new List<int> { 1, 1, 1, 1, 1 };
        List<int> result4 = DataAnalyzer.CumulativeMin(input4);
        if (!result4.SequenceEqual(expected4))
        {
            Console.WriteLine("Test Case 4 Failed");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All test cases passed.");
            return 0;
        }
        else
        {
            Console.WriteLine("Some test cases failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class DataAnalyzer
{
    public static List<int> CumulativeMin(List<int> numbers)
    {
        if (numbers == null || numbers.Count == 0)
        {
            throw new ArgumentException("The input list cannot be null or empty.", nameof(numbers));
        }
        List<int> cumulativeMins = new List<int>();
        int currentMin = numbers[0];
        foreach (int number in numbers)
        {
            if (number < currentMin)
            {
                currentMin = number;
            }
            cumulativeMins.Add(currentMin);
        }
        return cumulativeMins;
    }
    ;
        List<int> cumulativeMins = CumulativeMin(exampleNumbers);
        Console.WriteLine("Cumulative minimums: " + string.Join(", ", cumulativeMins));
    }
}

Imagine you're working on a data analysis tool and you need to implement a feature that tracks the cumulative minimum value in a sequence of numbers. This means, for each element in the list, you want to find the smallest number in the sequence up to and including that element. Can you write a C# method that accomplishes this? The method should take a list of integers as input and return a new list where each element is the minimum value found in the list up to that point.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class DataAnalyzer
{
    public static List<int> CumulativeMin(List<int> numbers)
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Globalization;

#<INSERT>

class HexToSpecialBinaryTest {
    public static int Main(string[] args) {
        bool allTestsPassed = true;

        // Test case 1
        string result1 = HexToSpecialBinary.HexadecimalToBinary("1A");
        if (result1 != "hx11010hx") {
            Console.WriteLine($"Test 1 Failed: Expected 'hx11010hx', but got '{result1}'");
            allTestsPassed = false;
        }

        // Test case 2
        string result2 = HexToSpecialBinary.HexadecimalToBinary("F");
        if (result2 != "hx1111hx") {
            Console.WriteLine($"Test 2 Failed: Expected 'hx1111hx', but got '{result2}'");
            allTestsPassed = false;
        }

        // Test case 3
        string result3 = HexToSpecialBinary.HexadecimalToBinary("10");
        if (result3 != "hx10000hx") {
            Console.WriteLine($"Test 3 Failed: Expected 'hx10000hx', but got '{result3}'");
            allTestsPassed = false;
        }

        // Test case 4
        string result4 = HexToSpecialBinary.HexadecimalToBinary("FF");
        if (result4 != "hx11111111hx") {
            Console.WriteLine($"Test 4 Failed: Expected 'hx11111111hx', but got '{result4}'");
            allTestsPassed = false;
        }

        // Test case 5
        string result5 = HexToSpecialBinary.HexadecimalToBinary("0");
        if (result5 != "hx0hx") {
            Console.WriteLine($"Test 5 Failed: Expected 'hx0hx', but got '{result5}'");
            allTestsPassed = false;
        }

        if (allTestsPassed) {
            Console.WriteLine("All tests passed!");
            return 0;
        } else {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Globalization;
class HexToSpecialBinary {
    public static string HexadecimalToBinary(string hexString) {
        string binaryStr = Convert.ToString(Convert.ToInt32(hexString, 16), 2);
        return $"hx{binaryStr}hx";
    }

}

Imagine you're working on a project where you need to frequently convert hexadecimal numbers into a special binary format. Your task is to write a C# function that takes a hexadecimal string as input and converts it into a binary string. However, there's a twist: the resulting binary string should be enclosed within the prefix and suffix "hx". For example, if the input is "A", the output should be "hx1010hx". Remember, the input will always be a valid hexadecimal string, and you should consider both uppercase and lowercase letters.

Can you craft a function that accomplishes this conversion, ensuring it's wrapped with "hx" at the beginning and end?

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class HexToSpecialBinary
{
    public static string HexadecimalToBinary(string hexString) {
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Text;
using System.Linq;

#<INSERT>

class TextFilterTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test case 1
        string input1 = "Hello123";
        string expected1 = "Hello";
        string result1 = TextFilter.FilterDigits(input1);
        if (result1 != expected1)
        {
            Console.WriteLine($"Test 1 Failed: Input = {input1}, Expected = {expected1}, Result = {result1}");
            allTestsPassed = false;
        }

        // Test case 2
        string input2 = "NoDigitsHere!";
        string expected2 = "NoDigitsHere!";
        string result2 = TextFilter.FilterDigits(input2);
        if (result2 != expected2)
        {
            Console.WriteLine($"Test 2 Failed: Input = {input2}, Expected = {expected2}, Result = {result2}");
            allTestsPassed = false;
        }

        // Test case 3
        string input3 = "1234567890";
        string expected3 = "";
        string result3 = TextFilter.FilterDigits(input3);
        if (result3 != expected3)
        {
            Console.WriteLine($"Test 3 Failed: Input = {input3}, Expected = {expected3}, Result = {result3}");
            allTestsPassed = false;
        }

        // Test case 4
        string input4 = "Mix4ed5TextWith6Digits7";
        string expected4 = "MixedTextWithDigits";
        string result4 = TextFilter.FilterDigits(input4);
        if (result4 != expected4)
        {
            Console.WriteLine($"Test 4 Failed: Input = {input4}, Expected = {expected4}, Result = {result4}");
            allTestsPassed = false;
        }

        if (allTestsPassed)
        {
            Console.WriteLine("All tests passed!");
            return 0;
        }
        else
        {
            Console.WriteLine("Some tests failed.");
            return -1;
        }
    }
}

using System.Security.Cryptography;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Text;
using System.Linq;
class TextFilter
{
    public static string FilterDigits(string input)
    {
        StringBuilder filteredText = new StringBuilder();
        foreach (char c in input)
        {
            if (!char.IsDigit(c))
            {
                filteredText.Append(c);
            }
        }
        return filteredText.ToString();
    }
    public
    private static void TestFilterDigits()
    {
        string[] testInputs = { "Hello123", "NoDigitsHere!", "1234567890", "Mix4ed5TextWith6Digits7" };
        string[] expectedOutputs = { "Hello", "NoDigitsHere!", "", "MixedTextWithDigits" };
        for (int i = 0; i < testInputs.Length; i++)
        {
            string result = FilterDigits(testInputs[i]);
            Console.WriteLine($"Test {i + 1}: Input = {testInputs[i]}, Expected = {expectedOutputs[i]}, Result = {result}");
            if (result == expectedOutputs[i])
            {
                Console.WriteLine("Test Passed!");
            }
            else
            {
                Console.WriteLine("Test Failed.");
            }
        }
    }
}

Imagine you're working on a text processing tool and you need to create a function that filters out all the digits from a given string, leaving only the letters and other characters untouched. This function should be efficient and work for any string input, regardless of its length or content. Write a complete, self-contained C# program that includes this function. Make sure to include all necessary imports at the beginning of your code snippet. Additionally, provide a method to test this function with various strings to ensure its correctness. The test method should verify that the output string indeed contains no digits and matches the expected result.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class TextFilter
{
    public
    {
        // Implement your code here.
    }
}
```


using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;

#<INSERT>

class ListFormatterTest
{
    public static int Main(string[] args)
    {
        bool allTestsPassed = true;

        // Test 1
        var test1 = ListFormatter.InsertSeparator(new List<string>{"apple", "banana", "cherry"}, ",");
        if (test1.Count != 5 || test1[1] != "," || test1[3] != ",")
        {
            Console.WriteLine("Test 1: Fail");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 1: Pass");
        }

        // Test 2
        var test2 = ListFormatter.InsertSeparator(new List<string>{"hello", "world"}, " ");
        if (test2.Count != 3 || test2[1] != " ")
        {
            Console.WriteLine("Test 2: Fail");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 2: Pass");
        }

        // Test 3
        var test3 = ListFormatter.InsertSeparator(new List<string>{"one"}, "-");
        if (test3.Count != 1 || test3[0] != "one")
        {
            Console.WriteLine("Test 3: Fail");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 3: Pass");
        }

        // Test 4
        var test4 = ListFormatter.InsertSeparator(new List<string>{}, ";");
        if (test4.Count != 0)
        {
            Console.WriteLine("Test 4: Fail");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 4: Pass");
        }

        // Test 5
        var test5 = ListFormatter.InsertSeparator(new List<string>{"a", "b", "c", "d"}, ", ");
        if (test5.Count != 7 || test5[1] != ", " || test5[3] != ", " || test5[5] != ", ")
        {
            Console.WriteLine("Test 5: Fail");
            allTestsPassed = false;
        }
        else
        {
            Console.WriteLine("Test 5: Pass");
        }

        return allTestsPassed ? 0 : -1;
    }
}

using System.Security.Cryptography;
using System.Text;
using System.Linq;
using System.Diagnostics;
using System.Numerics;
using System;
using System.Collections.Generic;
class ListFormatter
{
    public static List<string> InsertSeparator(List<string> items, string separator)
    {
        if (items == null || items.Count == 0)
            return new List<string>();
        List<string> formattedList = new List<string>();
        for (int i = 0; i < items.Count; i++)
        {
            formattedList.Add(items[i]);
            if (i < items.Count - 1)
            {
                formattedList.Add(separator);
            }
        }
        return formattedList;
    }
    public static void TestInsertSeparator()
    {
        var test1 = InsertSeparator(new List<string>{"apple", "banana", "cherry"}, ",");
        Console.WriteLine($"Test 1: {(test1.Count == 5 && test1[1] == "," && test1[3] == "," ? "Pass" : "Fail")}");
        var test2 = InsertSeparator(new List<string>{"hello", "world"}, " ");
        Console.WriteLine($"Test 2: {(test2.Count == 3 && test2[1] == " " ? "Pass" : "Fail")}");
        var test3 = InsertSeparator(new List<string>{}, ",");
        Console.WriteLine($"Test 3: {(test3.Count == 0 ? "Pass" : "Fail")}");
    }

}

Imagine you're working on a project where you need to format a list of items by adding a specific separator between each item. For example, you're given a list of words and you want to insert a comma `,` between each word to create a comma-separated list. However, the twist is that the separator should not appear at the end of the list. Can you write a function in C# that accomplishes this task? The function should take two parameters: a list of strings representing the words and a string representing the separator. It should return a new list with the separator correctly inserted. Make sure to include a way to test your function with a few examples.

Please use C# to implement the complete code without the Main function. Please follow the following type definitions:

```csharp
using xxx
...
class ListFormatter
{
    public static List<string> InsertSeparator(List<string> items, string separator)
    {
        // Implement your code here.
    }
}
```