public void TestFirstCase()
{
var tree = new TreeNode(3, new TreeNode(9), new TreeNode(20, new TreeNode(15), new TreeNode(7)));
var sol = new LevelOrderTraversal(tree);
var result = sol.LevelOrderBottom();
Assert.NotNull(result);
}
public IList <IList <int> > LevelOrderBottom(TreeNode root)
{
var result = new LevelOrderTraversal(root);
return(result.LevelOrderBottom());
}