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32 lines
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HTML
32 lines
1.0 KiB
HTML
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<p>输入一棵二叉树的根节点，判断该树是不是平衡二叉树。如果某二叉树中任意节点的左右子树的深度相差不超过1，那么它就是一棵平衡二叉树。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入：</strong>root = [3,9,20,null,null,15,7]
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<strong>输出：</strong>true
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<strong>解释：</strong>如下图
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</pre>
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<p><img alt="" src="https://pic.leetcode.cn/1695102431-vbmWJn-image.png" style="height: 281px; width: 500px;" /><br />
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<br />
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<strong>示例 2:</strong></p>
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<pre>
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输入：root = [1,2,2,3,3,null,null,4,4]
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输出：false
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解释：如下图
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</pre>
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<img alt="" src="https://pic.leetcode.cn/1695102434-WlaxCo-image.png" style="height: 281px; width: 500px;" />
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= 树的结点个数 <= 10000</code></li>
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</ul>
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<p>注意：本题与主站 110 题相同：<a href="https://leetcode-cn.com/problems/balanced-binary-tree/">https://leetcode-cn.com/problems/balanced-binary-tree/</a></p>
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