此时,另一个指针沿着环移动到环头需要步数:k*b - c = a;(k >= 1) 所以,两个指针第二次重合必定在环的开头位置。 ListNode *LeetCode::detectCycle(ListNode *head){if(!head)returnnullptr;boolhasCycle =false; ListNode*p = head, *q =head;while(q){ p= p->next;//p每次前进一步if(!q->ne...
142. Linked List Cycle II Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull. To represent a cycle in the given linked list, we use an integerposwhich represents the position (0-indexed) in the linked list where tail connects to. Ifposis-1...
Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Note: Do not modify the linked list. Follow up: Can you solve it without using extra space? 和上一道题不一样的是leetcode 141. Linked List Cycle 链表循环的判定 + 双指针,这道题还要求求...
leetcode -- Linked List Cycle -- 重点 AI检测代码解析 class Solution(object): def hasCycle(self, head): """ :type head: ListNode :rtype: bool """ if not head : return False slow, fast = head, head while fast and fast.next and fast != slow:#这里这个条件fast!=slow,使得在一开始...
Return true if there is a cycle in the linked list. Otherwise, return false. 英文版地址 leetcode.com/problems/l 中文版描述 给你一个链表的头节点 head ,判断链表中是否有环。如果链表中有某个节点,可以通过连续跟踪 next 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 ...
next = pre; // 由于已是最后一次插入,所以无需再移动尾结点 } // 返回结果链表的头结点 head_pre.next } } 题目链接: Linked List Cycle : leetcode.com/problems/l 环形链表: leetcode-cn.com/problem LeetCode 日更第 53 天,感谢阅读至此的你 欢迎点赞、收藏鼓励支持小满...
141 Linked..判断链表 LinkList 是否带循环。Given a linked list, determine if it has a cycle in it.To represent a cycle in t
Linked List Cycle Add all completed solutions Dec 28, 2021 List the Products Ordered in a Period 619. Biggest Single Number Apr 30, 2022 Longer Contiguous Segments of Ones than Zeros Add all completed solutions Dec 28, 2021 Longest Common Prefix Add all completed solutions Dec 28, 2021 ...
0141 Linked List Cycle Go 41.1% Easy 0142 Linked List Cycle II Go 37.3% Medium 0143 Reorder List Go 37.0% Medium 0144 Binary Tree Preorder Traversal Go 55.6% Medium 0145 Binary Tree Postorder Traversal Go 54.9% Hard 0146 LRU Cache 33.1% Medium 0147 Insertion Sort List Go 41.1% ...
* @param head: The first node of linked list. * @return: The node where the cycle begins. * if there is no cycle, return null */ public ListNode detectCycle(ListNode head) { if(head == null || head.next == null) return null; ...