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0951-flip-equivalent-binary-trees/README.md

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+<h2><a href="https://leetcode.com/problems/flip-equivalent-binary-trees/?envType=daily-question&envId=2024-10-24">951. Flip Equivalent Binary Trees</a></h2><h3>Medium</h3><hr><p>For a binary tree <strong>T</strong>, we can define a <strong>flip operation</strong> as follows: choose any node, and swap the left and right child subtrees.</p>
+
+<p>A binary tree <strong>X</strong>&nbsp;is <em>flip equivalent</em> to a binary tree <strong>Y</strong> if and only if we can make <strong>X</strong> equal to <strong>Y</strong> after some number of flip operations.</p>
+
+<p>Given the roots of two binary trees <code>root1</code> and <code>root2</code>, return <code>true</code> if the two trees are flip equivalent or <code>false</code> otherwise.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="Flipped Trees Diagram" src="https://assets.leetcode.com/uploads/2018/11/29/tree_ex.png" style="width: 500px; height: 220px;" />
+<pre>
+<strong>Input:</strong> root1 = [1,2,3,4,5,6,null,null,null,7,8], root2 = [1,3,2,null,6,4,5,null,null,null,null,8,7]
+<strong>Output:</strong> true
+<strong>Explanation: </strong>We flipped at nodes with values 1, 3, and 5.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> root1 = [], root2 = []
+<strong>Output:</strong> true
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> root1 = [], root2 = [1]
+<strong>Output:</strong> false
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in each tree is in the range <code>[0, 100]</code>.</li>
+	<li>Each tree will have <strong>unique node values</strong> in the range <code>[0, 99]</code>.</li>
+</ul>