leetcode-problemset/leetcode-cn/originData/c32eOV.json

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            "questionId": "1000258",
            "questionFrontendId": "剑指 Offer II 022",
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            "title": "链表中环的入口节点",
            "titleSlug": "c32eOV",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "链表中环的入口节点",
            "translatedContent": "<p>给定一个链表，返回链表开始入环的第一个节点。 从链表的头节点开始沿着 <code>next</code> 指针进入环的第一个节点为环的入口节点。如果链表无环，则返回&nbsp;<code>null</code>。</p>\n\n<p>为了表示给定链表中的环，我们使用整数 <code>pos</code> 来表示链表尾连接到链表中的位置（索引从 0 开始）。 如果 <code>pos</code> 是 <code>-1</code>，则在该链表中没有环。<strong>注意，<code>pos</code> 仅仅是用于标识环的情况，并不会作为参数传递到函数中。</strong></p>\n\n<p><strong>说明：</strong>不允许修改给定的链表。</p>\n\n<ul>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/12/07/circularlinkedlist.png\" style=\"height: 97px; width: 300px;\" /></p>\n\n<pre>\n<strong>输入：</strong>head = [3,2,0,-4], pos = 1\n<strong>输出：</strong>返回索引为 1 的链表节点\n<strong>解释：</strong>链表中有一个环，其尾部连接到第二个节点。\n</pre>\n\n<p><strong>示例&nbsp;2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/12/07/circularlinkedlist_test2.png\" style=\"height: 74px; width: 141px;\" /></p>\n\n<pre>\n<strong>输入：</strong>head = [1,2], pos = 0\n<strong>输出：</strong>返回索引为 0 的链表节点\n<strong>解释：</strong>链表中有一个环，其尾部连接到第一个节点。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/12/07/circularlinkedlist_test3.png\" style=\"height: 45px; width: 45px;\" /></p>\n\n<pre>\n<strong>输入：</strong>head = [1], pos = -1\n<strong>输出：</strong>返回 null\n<strong>解释：</strong>链表中没有环。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>链表中节点的数目范围在范围 <code>[0, 10<sup>4</sup>]</code> 内</li>\n\t<li><code>-10<sup>5</sup> &lt;= Node.val &lt;= 10<sup>5</sup></code></li>\n\t<li><code>pos</code> 的值为 <code>-1</code> 或者链表中的一个有效索引</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>进阶：</strong>是否可以使用 <code>O(1)</code> 空间解决此题？</p>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 142&nbsp;题相同：&nbsp;<a href=\"https://leetcode-cn.com/problems/linked-list-cycle-ii/\">https://leetcode-cn.com/problems/linked-list-cycle-ii/</a></p>\n",
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