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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace BinaryTreeRightSideView
{
public class TreeNode
{
public int val;
public TreeNode left;
public TreeNode right;
public TreeNode(int val = 0, TreeNode left = null, TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
public IList<int> RightSideView(TreeNode root)
{
var res = new List<int>();
if (root == null) return res;
var queue = new Queue<TreeNode>();
queue.Enqueue(root);
while (queue.Count != 0)
{
var count = queue.Count;
while (count != 0)
{
var current = queue.Dequeue();
if (current.left != null) queue.Enqueue(current.left);
if (current.right != null) queue.Enqueue(current.right);
count--;
if (count == 0)
res.Add(current.val);
}
}
return res;
}
}
}