leetcode-problemset/leetcode-cn/originData/er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof.json

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            "questionId": "100305",
            "questionFrontendId": "LCR 155",
            "categoryTitle": "Algorithms",
            "boundTopicId": 87118,
            "title": "将二叉搜索树转化为排序的双向链表",
            "titleSlug": "er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof",
            "content": "English description is not available for the problem. Please switch to Chinese.",
            "translatedTitle": "将二叉搜索树转化为排序的双向链表",
            "translatedContent": "<p>将一个 <strong>二叉搜索树</strong> 就地转化为一个 <strong>已排序的双向循环链表</strong> 。</p>\n\n<p>对于双向循环列表，你可以将左右孩子指针作为双向循环链表的前驱和后继指针，第一个节点的前驱是最后一个节点，最后一个节点的后继是第一个节点。</p>\n\n<p>特别地，我们希望可以 <strong>就地</strong> 完成转换操作。当转化完成以后，树中节点的左指针需要指向前驱，树中节点的右指针需要指向后继。还需要返回链表中最小元素的指针。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>root = [4,2,5,1,3] \n\n<img src=\"https://assets.leetcode.com/uploads/2018/10/12/bstdllreturndll.png\" />\n<strong>输出：</strong>[1,2,3,4,5]\n\n<strong>解释：</strong>下图显示了转化后的二叉搜索树，实线表示后继关系，虚线表示前驱关系。\n<img src=\"https://assets.leetcode.com/uploads/2018/10/12/bstdllreturnbst.png\" />\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>root = [2,1,3]\n<strong>输出：</strong>[1,2,3]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>root = []\n<strong>输出：</strong>[]\n<strong>解释：</strong>输入是空树，所以输出也是空链表。\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<strong>输入：</strong>root = [1]\n<strong>输出：</strong>[1]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>-1000 &lt;= Node.val &lt;= 1000</code></li>\n\t<li><code>Node.left.val &lt; Node.val &lt; Node.right.val</code></li>\n\t<li><code>Node.val</code> 的所有值都是独一无二的</li>\n\t<li><code>0 &lt;= Number of Nodes &lt;= 2000</code></li>\n</ul>\n\n<p>注意：本题与主站 426 题相同：<a href=\"https://leetcode-cn.com/problems/convert-binary-search-tree-to-sorted-doubly-linked-list/\" rel=\"noopener noreferrer\" target=\"_blank\">https://leetcode-cn.com/problems/convert-binary-search-tree-to-sorted-doubly-linked-list/</a></p>\n",
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            "topicTags": [
                {
                    "name": "Stack",
                    "slug": "stack",
                    "translatedName": "栈",
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Tree",
                    "slug": "tree",
                    "translatedName": "树",
                    "__typename": "TopicTagNode"
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                {
                    "name": "Depth-First Search",
                    "slug": "depth-first-search",
                    "translatedName": "深度优先搜索",
                    "__typename": "TopicTagNode"
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                    "name": "Binary Search Tree",
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                    "translatedName": "二叉搜索树",
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                    "name": "Linked List",
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                    "translatedName": "链表",
                    "__typename": "TopicTagNode"
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                    "name": "Binary Tree",
                    "slug": "binary-tree",
                    "translatedName": "二叉树",
                    "__typename": "TopicTagNode"
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                {
                    "name": "Doubly-Linked List",
                    "slug": "doubly-linked-list",
                    "translatedName": "双向链表",
                    "__typename": "TopicTagNode"
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