private static string GetKeysAsCommaSeparatedString(BinarySearchTreeNode <int, int> root)
{
var bfs = new StringBuilder();
root.BreadthFirstSearch(node =>
{
if (bfs.Length > 0)
{
bfs.Append(",");
}
bfs.Append(node.Value.Key);
return(false);
});
return(bfs.ToString());
}
