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35 lines
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35 lines
1.7 KiB
HTML
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<p>给定一个二叉树, 找到该树中两个指定节点的最近公共祖先。</p>
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<p><a href="https://baike.baidu.com/item/%E6%9C%80%E8%BF%91%E5%85%AC%E5%85%B1%E7%A5%96%E5%85%88/8918834?fr=aladdin" target="_blank">百度百科</a>中最近公共祖先的定义为：“对于有根树 T 的两个结点 p、q，最近公共祖先表示为一个结点 x，满足 x 是 p、q 的祖先且 x 的深度尽可能大（<strong>一个节点也可以是它自己的祖先</strong>）。”</p>
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<p>例如，给定如下二叉树: root = [3,5,1,6,2,0,8,null,null,7,4]</p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/12/15/binarytree.png"></p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre><strong>输入:</strong> root = [3,5,1,6,2,0,8,null,null,7,4], p = 5, q = 1
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<strong>输出:</strong> 3
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<strong>解释: </strong>节点 <code>5 </code>和节点 <code>1 </code>的最近公共祖先是节点 <code>3。</code>
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre><strong>输入:</strong> root = [3,5,1,6,2,0,8,null,null,7,4], p = 5, q = 4
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<strong>输出:</strong> 5
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<strong>解释: </strong>节点 <code>5 </code>和节点 <code>4 </code>的最近公共祖先是节点 <code>5。</code>因为根据定义最近公共祖先节点可以为节点本身。
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</pre>
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<p> </p>
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<p><strong>说明:</strong></p>
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<ul>
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<li>所有节点的值都是唯一的。</li>
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<li>p、q 为不同节点且均存在于给定的二叉树中。</li>
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</ul>
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<p>注意：本题与主站 236 题相同：<a href="https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/">https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/</a></p>
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