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Program.cs
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Program.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
namespace InvertBinaryTree
{
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 TreeNode InvertTree_DFS(TreeNode root)
{
if (root == null) return root;
var left = InvertTree_DFS(root.right);
var right = InvertTree_DFS(root.left);
root.left = left;
root.right = right;
return root;
}
public TreeNode InvertTree_BFS(TreeNode root)
{
if (root == null) return root;
var queue = new Queue<TreeNode>();
queue.Enqueue(root);
while (queue.Count != 0)
{
var cur = queue.Dequeue();
var temp = cur.left;
cur.left = cur.right;
cur.right = temp;
if(cur.left != null) queue.Enqueue(cur.left);
if(cur.right != null) queue.Enqueue(cur.right);
}
return root;
}
}
}