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LeetCode 141. Linked List Cycle.html
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<meta name="description" content="141. Linked List Cycle（环形链表）链接https://leetcode-cn.com/problems/linked-list-cycle 题目给定一个链表，判断链表中是否有环。 为了表示给定链表中的环，我们使用整数 pos 来表示链表尾连接到链表中的位置（索引从 0 开始）。 如果 pos 是 -1，则在该链表中没有环。 示例 1： 输入：head = [3,2,0,-">
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<meta property="og:description" content="141. Linked List Cycle（环形链表）链接https://leetcode-cn.com/problems/linked-list-cycle 题目给定一个链表，判断链表中是否有环。 为了表示给定链表中的环，我们使用整数 pos 来表示链表尾连接到链表中的位置（索引从 0 开始）。 如果 pos 是 -1，则在该链表中没有环。 示例 1： 输入：head = [3,2,0,-">
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<h1 class="post-title" itemprop="name headline">LeetCode 141. Linked List Cycle</h1>
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<h2 id="141-Linked-List-Cycle（环形链表）"><a href="#141-Linked-List-Cycle（环形链表）" class="headerlink" title="141. Linked List Cycle（环形链表）"></a>141. Linked List Cycle（环形链表）</h2><h3 id="链接"><a href="#链接" class="headerlink" title="链接"></a>链接</h3><p><a href="https://leetcode-cn.com/problems/linked-list-cycle" target="_blank" rel="noopener">https://leetcode-cn.com/problems/linked-list-cycle</a></p>
<h3 id="题目"><a href="#题目" class="headerlink" title="题目"></a>题目</h3><p>给定一个链表，判断链表中是否有环。</p>
<p>为了表示给定链表中的环，我们使用整数 pos 来表示链表尾连接到链表中的位置（索引从 0 开始）。 如果 pos 是 -1，则在该链表中没有环。</p>
<p>示例 1：</p>
<p> 输入：head = [3,2,0,-4], pos = 1<br> 输出：true<br> 解释：链表中有一个环，其尾部连接到第二个节点。</p>
<p>示例 2：</p>
<p> 输入：head = [1,2], pos = 0<br> 输出：true<br> 解释：链表中有一个环，其尾部连接到第一个节点。</p>
<p>示例 3：</p>
<p> 输入：head = [1], pos = -1<br> 输出：false<br> 解释：链表中没有环。</p>
<p>进阶：</p>
<p>你能用 O(1)（即，常量）内存解决此问题吗？</p>
<h3 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h3><p>快慢指针法，快的一次走两步，慢的一次走一步，每次的差值都是1步，如果快的能追上慢的，就代表成环。</p>
<h3 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">class ListNode {</span><br><span class="line"></span><br><span class="line"> int val;</span><br><span class="line"> ListNode next;</span><br><span class="line"></span><br><span class="line"> ListNode(int x) {</span><br><span class="line"> val = x;</span><br><span class="line"> next = null;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">public boolean hasCycle(ListNode head) {</span><br><span class="line"> if (head == null || head.next == null) {</span><br><span class="line"> return false;</span><br><span class="line"> }</span><br><span class="line"> ListNode slow = head;</span><br><span class="line"> ListNode fast = head.next;</span><br><span class="line"> while (slow != fast) {</span><br><span class="line"> if (fast.next == null || fast.next.next == null) {</span><br><span class="line"> return false;</span><br><span class="line"> }</span><br><span class="line"> slow = slow.next;</span><br><span class="line"> fast = fast.next.next;</span><br><span class="line"> }</span><br><span class="line"> return true;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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