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"translatedContent": "<p>给你一个链表的头节点 <code>head</code> ,判断链表中是否有环。</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(索引从 0 开始)。<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><em>如果链表中存在环</em> ,则返回 <code>true</code> 。 否则,返回 <code>false</code> 。</p>\n\n<p> </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\" /></p>\n\n<pre>\n<strong>输入:</strong>head = [3,2,0,-4], pos = 1\n<strong>输出:</strong>true\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 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>true\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>false\n<strong>解释:</strong>链表中没有环。\n</pre>\n\n<p> </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是 <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><code>pos</code> 为 <code>-1</code> 或者链表中的一个 <strong>有效索引</strong> 。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶:</strong>你能用 <code>O(1)</code>(即,常量)内存解决此问题吗?</p>\n",
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