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leetcode-problemset/leetcode-cn/originData/lowest-common-ancestor-of-deepest-leaves.json
2023-12-09 19:57:46 +08:00

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"data": {
"question": {
"questionId": "1218",
"questionFrontendId": "1123",
"categoryTitle": "Algorithms",
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"title": "Lowest Common Ancestor of Deepest Leaves",
"titleSlug": "lowest-common-ancestor-of-deepest-leaves",
"content": "<p>Given the <code>root</code> of a binary tree, return <em>the lowest common ancestor of its deepest leaves</em>.</p>\n\n<p>Recall that:</p>\n\n<ul>\n\t<li>The node of a binary tree is a leaf if and only if it has no children</li>\n\t<li>The depth of the root of the tree is <code>0</code>. if the depth of a node is <code>d</code>, the depth of each of its children is <code>d + 1</code>.</li>\n\t<li>The lowest common ancestor of a set <code>S</code> of nodes, is the node <code>A</code> with the largest depth such that every node in <code>S</code> is in the subtree with root <code>A</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://s3-lc-upload.s3.amazonaws.com/uploads/2018/07/01/sketch1.png\" style=\"width: 600px; height: 510px;\" />\n<pre>\n<strong>Input:</strong> root = [3,5,1,6,2,0,8,null,null,7,4]\n<strong>Output:</strong> [2,7,4]\n<strong>Explanation:</strong> We return the node with value 2, colored in yellow in the diagram.\nThe nodes coloured in blue are the deepest leaf-nodes of the tree.\nNote that nodes 6, 0, and 8 are also leaf nodes, but the depth of them is 2, but the depth of nodes 7 and 4 is 3.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> root = [1]\n<strong>Output:</strong> [1]\n<strong>Explanation:</strong> The root is the deepest node in the tree, and it&#39;s the lca of itself.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> root = [0,1,3,null,2]\n<strong>Output:</strong> [2]\n<strong>Explanation:</strong> The deepest leaf node in the tree is 2, the lca of one node is itself.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree will be in the range <code>[1, 1000]</code>.</li>\n\t<li><code>0 &lt;= Node.val &lt;= 1000</code></li>\n\t<li>The values of the nodes in the tree are <strong>unique</strong>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Note:</strong> This question is the same as 865: <a href=\"https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/\" target=\"_blank\">https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/</a></p>\n",
"translatedTitle": "最深叶节点的最近公共祖先",
"translatedContent": "<p>给你一个有根节点<meta charset=\"UTF-8\" />&nbsp;<code>root</code>&nbsp;的二叉树,返回它&nbsp;<em>最深的叶节点的最近公共祖先</em>&nbsp;。</p>\n\n<p>回想一下:</p>\n\n<ul>\n\t<li><strong>叶节点</strong> 是二叉树中没有子节点的节点</li>\n\t<li>树的根节点的&nbsp;<strong>深度&nbsp;</strong>为&nbsp;<code>0</code>,如果某一节点的深度为&nbsp;<code>d</code>,那它的子节点的深度就是&nbsp;<code>d+1</code></li>\n\t<li>如果我们假定 <code>A</code> 是一组节点&nbsp;<code>S</code>&nbsp;的 <strong>最近公共祖先</strong><code>S</code>&nbsp;中的每个节点都在以 <code>A</code> 为根节点的子树中,且 <code>A</code>&nbsp;的深度达到此条件下可能的最大值。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://s3-lc-upload.s3.amazonaws.com/uploads/2018/07/01/sketch1.png\" style=\"height: 340px; width: 400px;\" />\n<pre>\n<strong>输入:</strong>root = [3,5,1,6,2,0,8,null,null,7,4]\n<strong>输出:</strong>[2,7,4]\n<strong>解释:</strong>我们返回值为 2 的节点,在图中用黄色标记。\n在图中用蓝色标记的是树的最深的节点。\n注意节点 6、0 和 8 也是叶节点,但是它们的深度是 2 ,而节点 7 和 4 的深度是 3 。\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>root = [1]\n<strong>输出:</strong>[1]\n<strong>解释:</strong>根节点是树中最深的节点,它是它本身的最近公共祖先。\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre>\n<strong>输入:</strong>root = [0,1,3,null,2]\n<strong>输出:</strong>[2]\n<strong>解释:</strong>树中最深的叶节点是 2 ,最近公共祖先是它自己。</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中的节点数将在<meta charset=\"UTF-8\" />&nbsp;<code>[1, 1000]</code>&nbsp;的范围内。</li>\n\t<li><code>0 &lt;= Node.val &lt;= 1000</code></li>\n\t<li>每个节点的值都是&nbsp;<strong>独一无二</strong>&nbsp;的。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>注意:</strong>本题与力扣 865 重复:<a href=\"https://leetcode-cn.com/problems/smallest-subtree-with-all-the-deepest-nodes/\">https://leetcode-cn.com/problems/smallest-subtree-with-all-the-deepest-nodes/</a></p>\n",
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