mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
28 KiB
JSON
180 lines
28 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "450",
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"questionFrontendId": "450",
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"categoryTitle": "Algorithms",
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"boundTopicId": 1756,
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"title": "Delete Node in a BST",
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"titleSlug": "delete-node-in-a-bst",
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"content": "<p>Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return <em>the <strong>root node reference</strong> (possibly updated) of the BST</em>.</p>\n\n<p>Basically, the deletion can be divided into two stages:</p>\n\n<ol>\n\t<li>Search for a node to remove.</li>\n\t<li>If the node is found, delete the node.</li>\n</ol>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/04/del_node_1.jpg\" style=\"width: 800px; height: 214px;\" />\n<pre>\n<strong>Input:</strong> root = [5,3,6,2,4,null,7], key = 3\n<strong>Output:</strong> [5,4,6,2,null,null,7]\n<strong>Explanation:</strong> Given key to delete is 3. So we find the node with value 3 and delete it.\nOne valid answer is [5,4,6,2,null,null,7], shown in the above BST.\nPlease notice that another valid answer is [5,2,6,null,4,null,7] and it's also accepted.\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/04/del_node_supp.jpg\" style=\"width: 350px; height: 255px;\" />\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> root = [5,3,6,2,4,null,7], key = 0\n<strong>Output:</strong> [5,3,6,2,4,null,7]\n<strong>Explanation:</strong> The tree does not contain a node with value = 0.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> root = [], key = 0\n<strong>Output:</strong> []\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[0, 10<sup>4</sup>]</code>.</li>\n\t<li><code>-10<sup>5</sup> <= Node.val <= 10<sup>5</sup></code></li>\n\t<li>Each node has a <strong>unique</strong> value.</li>\n\t<li><code>root</code> is a valid binary search tree.</li>\n\t<li><code>-10<sup>5</sup> <= key <= 10<sup>5</sup></code></li>\n</ul>\n\n<p> </p>\n<p><strong>Follow up:</strong> Could you solve it with time complexity <code>O(height of tree)</code>?</p>\n",
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"translatedTitle": "删除二叉搜索树中的节点",
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"translatedContent": "<p>给定一个二叉搜索树的根节点 <strong>root </strong>和一个值 <strong>key</strong>，删除二叉搜索树中的 <strong>key </strong>对应的节点，并保证二叉搜索树的性质不变。返回二叉搜索树（有可能被更新）的根节点的引用。</p>\n\n<p>一般来说，删除节点可分为两个步骤：</p>\n\n<ol>\n\t<li>首先找到需要删除的节点；</li>\n\t<li>如果找到了，删除它。</li>\n</ol>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2020/09/04/del_node_1.jpg\" style=\"width: 800px;\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [5,3,6,2,4,null,7], key = 3\n<strong>输出：</strong>[5,4,6,2,null,null,7]\n<strong>解释：</strong>给定需要删除的节点值是 3，所以我们首先找到 3 这个节点，然后删除它。\n一个正确的答案是 [5,4,6,2,null,null,7], 如下图所示。\n另一个正确答案是 [5,2,6,null,4,null,7]。\n\n<img src=\"https://assets.leetcode.com/uploads/2020/09/04/del_node_supp.jpg\" style=\"width: 350px;\" />\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong> root = [5,3,6,2,4,null,7], key = 0\n<strong>输出:</strong> [5,3,6,2,4,null,7]\n<strong>解释:</strong> 二叉树不包含值为 0 的节点\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong> root = [], key = 0\n<strong>输出:</strong> []</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>节点数的范围 <code>[0, 10<sup>4</sup>]</code>.</li>\n\t<li><code>-10<sup>5</sup> <= Node.val <= 10<sup>5</sup></code></li>\n\t<li>节点值唯一</li>\n\t<li><code>root</code> 是合法的二叉搜索树</li>\n\t<li><code>-10<sup>5</sup> <= key <= 10<sup>5</sup></code></li>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶：</strong> 要求算法时间复杂度为 O(h)，h 为树的高度。</p>\n",
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