private static void Main(string[] args)
{
var graph = new Graph <char>();
graph.AddNode('A');
graph.AddNode('B');
graph.AddNode('C');
graph.AddNode('D');
graph.AddNode('E');
graph.AddNode('F');
graph.AddEdge('A', 'B');
graph.AddEdge('A', 'C');
graph.AddEdge('A', 'D');
graph.AddEdge('B', 'C');
graph.AddEdge('B', 'E');
graph.AddEdge('C', 'D');
graph.AddEdge('C', 'E');
graph.AddEdge('C', 'F');
graph.AddEdge('D', 'F');
var visited = new List <char>();
graph.BreadthFirstTraverse('A', ref visited);
for (var i = 0; i < visited.Count; i++)
{
Console.WriteLine(visited[i]);
}
Console.ReadKey();
}