private static Graph loadGraph(string inputFile) { IInputLoader l; var ext = new System.IO.FileInfo(inputFile).Extension; if (ext.Equals(".txt")) { l = new TestInput(); } else if (ext.Equals(".col")) { l = new GeneratedSampleInput(); } else { l = new TestInput(); Console.Error.WriteLine("Warning: could not determine input type for extension {0}", ext); } Graph g = l.load(inputFile); return(g); }