leetcode-problemset/leetcode-cn/originData/linked-list-cycle-ii.json

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            "questionId": "142",
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            "title": "Linked List Cycle II",
            "titleSlug": "linked-list-cycle-ii",
            "content": "<p>Given the <code>head</code> of a linked list, return <em>the node where the cycle begins. If there is no cycle, return </em><code>null</code>.</p>\n\n<p>There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the <code>next</code> pointer. Internally, <code>pos</code> is used to denote the index of the node that tail&#39;s <code>next</code> pointer is connected to (<strong>0-indexed</strong>). It is <code>-1</code> if there is no cycle. <strong>Note that</strong> <code>pos</code> <strong>is not passed as a parameter</strong>.</p>\n\n<p><strong>Do not modify</strong> the linked list.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2018/12/07/circularlinkedlist.png\" style=\"height: 145px; width: 450px;\" />\n<pre>\n<strong>Input:</strong> head = [3,2,0,-4], pos = 1\n<strong>Output:</strong> tail connects to node index 1\n<strong>Explanation:</strong> There is a cycle in the linked list, where tail connects to the second node.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2018/12/07/circularlinkedlist_test2.png\" style=\"height: 105px; width: 201px;\" />\n<pre>\n<strong>Input:</strong> head = [1,2], pos = 0\n<strong>Output:</strong> tail connects to node index 0\n<strong>Explanation:</strong> There is a cycle in the linked list, where tail connects to the first node.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2018/12/07/circularlinkedlist_test3.png\" style=\"height: 65px; width: 65px;\" />\n<pre>\n<strong>Input:</strong> head = [1], pos = -1\n<strong>Output:</strong> no cycle\n<strong>Explanation:</strong> There is no cycle in the linked list.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of the nodes in the list is in the range <code>[0, 10<sup>4</sup>]</code>.</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> is <code>-1</code> or a <strong>valid index</strong> in the linked-list.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Follow up:</strong> Can you solve it using <code>O(1)</code> (i.e. constant) memory?</p>\n",
            "translatedTitle": "环形链表 II",
            "translatedContent": "<p>给定一个链表的头节点 &nbsp;<code>head</code>&nbsp;，返回链表开始入环的第一个节点。&nbsp;<em>如果链表无环，则返回&nbsp;<code>null</code>。</em></p>\n\n<p>如果链表中有某个节点，可以通过连续跟踪 <code>next</code> 指针再次到达，则链表中存在环。 为了表示给定链表中的环，评测系统内部使用整数 <code>pos</code> 来表示链表尾连接到链表中的位置（<strong>索引从 0 开始</strong>）。如果 <code>pos</code> 是 <code>-1</code>，则在该链表中没有环。<strong>注意：<code>pos</code> 不作为参数进行传递</strong>，仅仅是为了标识链表的实际情况。</p>\n\n<p><strong>不允许修改 </strong>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 src=\"https://assets.leetcode.com/uploads/2018/12/07/circularlinkedlist.png\" /></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\" /></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\" /></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>你是否可以使用 <code>O(1)</code> 空间解决此题？</p>\n",
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