invert-binary-tree

java

python3

python

javascript

typescript

csharp

golang

kotlin

swift

rust

ruby

dart

scala

elixir

erlang

racket

cangjie

bash

mysql

mssql

postgresql

oraclesql

pythondata

Algorithms

Given the <code>root</code> of a binary tree, invert the tree, and return its root.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2021/03/14/invert1-tree.jpg" style="width: 500px; height: 165px;" />
<pre>
Input: root = [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2021/03/14/invert2-tree.jpg" style="width: 500px; height: 120px;" />
<pre>
Input: root = [2,1,3]
Output: [2,3,1]
</pre>

Example 3:

<pre>
Input: root = []
Output: []
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the tree is in the range <code>[0, 100]</code>.</li>
	<li><code>-100 &lt;= Node.val &lt;= 100</code></li>
</ul>

invertTree

Invert Binary Tree

Reverse Odd Levels of Binary Tree

reverse-odd-levels-of-binary-tree

反转二叉树的奇数层

Tree

Depth-First Search

Breadth-First Search

Binary Tree

&#32473;&#20320;&#19968;&#26869;&#20108;&#21449;&#26641;&#30340;&#26681;&#33410;&#28857; <code>root</code> &#65292;&#32763;&#36716;&#36825;&#26869;&#20108;&#21449;&#26641;&#65292;&#24182;&#36820;&#22238;&#20854;&#26681;&#33410;&#28857;&#12290;

&nbsp;

&#31034;&#20363; 1&#65306;

<img alt="" src="https://assets.leetcode.com/uploads/2021/03/14/invert1-tree.jpg" style="height: 165px; width: 500px;" />

<pre>
&#36755;&#20837;&#65306;root = [4,2,7,1,3,6,9]
&#36755;&#20986;&#65306;[4,7,2,9,6,3,1]
</pre>

&#31034;&#20363; 2&#65306;

<img alt="" src="https://assets.leetcode.com/uploads/2021/03/14/invert2-tree.jpg" style="width: 500px; height: 120px;" />

<pre>
&#36755;&#20837;&#65306;root = [2,1,3]
&#36755;&#20986;&#65306;[2,3,1]
</pre>

&#31034;&#20363; 3&#65306;

<pre>
&#36755;&#20837;&#65306;root = []
&#36755;&#20986;&#65306;[]
</pre>

&nbsp;

&#25552;&#31034;&#65306;

<ul>
	<li>&#26641;&#20013;&#33410;&#28857;&#25968;&#30446;&#33539;&#22260;&#22312; <code>[0, 100]</code> &#20869;</li>
	<li><code>-100 &lt;= Node.val &lt;= 100</code></li>
</ul>

Sunbelt Computer Software

PL/B Language Development and Support