invert-binary-tree

Algorithms

Invert Binary Tree

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invertTree

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>

Tree

Depth-First Search

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Binary Tree

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