leetcode141

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每天一道LeetCode--141.Linked List Cycle（链表环问题）

Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 参考博客:链表环状检测 package cn.magicdu; import cn.magicdu.extra.ListNode; public class _114_Linked_List_Cycle { public boolean hasCycle(ListNode hea…

[LeetCode141]Linked List Cycle

题目:Given a linked list, determine if it has a cycle in it. 判断一个链表是否有环代码: /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: bool hasCyc…

[Java]LeetCode141. 环形链表 | 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? 给定一个链表,判断链表中是否有环. 进阶:你能否不使用额外空间解决此题? 0ms /** * Definition for singly-linked list. * class ListNode { * int val; * ListNode next; * ListNode…

/** * Definition for singly-linked list. * public class ListNode { * public int val; * public ListNode next; * public ListNode(int x) { * val = x; * next = null; * } * } */ public class Solution { public bool HasCycle(ListNode head) { //if (head == n…

LeetCode141.环形链表

给定一个链表,判断链表中是否有环. 进阶:你能否不使用额外空间解决此题? /** * Definition for singly-linked list. * class ListNode { * int val; * ListNode next; * ListNode(int x) { * val = x; * next = null; * } * } */ public class Solution { public boolean hasCycle(ListNode head) { if…

LeetCode141：Linked List Cycle

题目: Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 解题思路: 判断链表有无环,可用快慢指针进行,快指针每次走两步,慢指针每次走一步,如果快指针追上了慢指针,则存在环,否则,快指针走到链表末尾即为NULL是也没追上,则无环. 为什么快慢指针可以判断有无环? 因为快指针先进入环,在慢指针进入之后,如果把慢指针看作在前面,快…

LeetCode141 Linked List Cycle. LeetCode142 Linked List Cycle II

链表相关题 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? (Easy) 分析: 采用快慢指针,一个走两步,一个走一步,快得能追上慢的说明有环,走到nullptr还没有相遇说明没有环. 代码: /** * Definition for singly-linked list. * s…