 		int vwsize = 32;
 		int threads = 1;
 		long long arbparam = 0;
+		bool nonDirectedGraph = false;		// By default, the graph is directed.
 
 		/********************************
 		 * GETTING INPUT PARAMETERS.

				vwsize = std::atoi( argv[iii+1] );
			else if( !strcmp( argv[iii], "--arbparam" ) && iii != argc-1 /*is not the last one*/)
				arbparam = std::atoll( argv[iii+1] );

		if( !inputFile.is_open() || procesingMethod == UNSPECIFIED ) {
			std::cerr << "Usage: " << usage;

			-Processing method: CW, GS, VWC. E.g., --method CW\n\
		Additional arguments:\n\
			-Output file (default: out.txt). E.g., --output myout.txt.\n\
			-Is the input graph directed (default:yes). To make it undirected: --undirected\n\
			-Device ID (default: 0). E.g., --device 1\n\
			-GPU kernels Block size for CW and GS (default: chosen based on analysis). E.g., --bsize 512.\n\
			-Virtual warp size for VWC (default: 32). E.g., --vwsize 8.\n\
