Linked List Cycle 判断一个链表是否存在回路(循环)

【Linked List Cycle 判断一个链表是否存在回路(循环)】的更多相关文章

Linked List Cycle 判断一个链表是否存在回路(循环)

Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 注意,链表循环并不是尾指针和头指针相同,可能是在中间某一段形成一个环路,所以不能只判断元素和第一个元素是否存在重合先设置两个指针p_fast和p_slow.从头开始遍历链表,p_fast每次走两个节点,而p_slow每次走一个节点,若存在循环,这两个指针必定重合: /** *…

[算法][LeetCode]Linked List Cycle & Linked List Cycle II——单链表中的环

题目要求 Linked List Cycle Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 如何判断一个单链表中有环? Linked List Cycle II Given a linked list, return the node where the cycle begins. If there is no cycle…

[leetcode]141. Linked List Cycle判断链表是否有环

Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 题意: 给定一个链表,判断是否有环思路: 快慢指针若有环,则快慢指针一定会在某个节点相遇(此处省略证明) 代码: public class Solution { public boolean hasCycle(ListNode head) { ListNode fast =…

141. Linked List Cycle(判断链表是否有环)

141. Linked List Cycle Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 利用快慢指针,如果相遇则证明有环注意边界条件: 如果只有一个node. public class Solution { public boolean hasCycle(ListNode head) { if(head==null |…

[LeetCode] Linked List Cycle II 单链表中的环之二

Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Follow up: Can you solve it without using extra space? 这个求单链表中的环的起始点是之前那个判断单链表中是否有环的延伸,可参见我之前的一篇文章 (http://www.cnblogs.com/grandyang/p/4137187.html). 还是要设…

[LeetCode] 142. Linked List Cycle II 单链表中的环之二

Given a linked list, return the node where the cycle begins. If there is no cycle, return null. To represent a cycle in the given linked list, we use an integer pos which represents the position (0-indexed) in the linked list where tail connects to.…

力扣——Linked List Cycle（环形链表） python实现

题目描述: 中文: 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. 英文: Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos which represents the…