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…

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? 说明:两个指针不同步长. /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x)…

LeetCode解题报告:Linked List Cycle && Linked List Cycle II 1题目 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? Linked List Cycle II Given a linked list, return the node w…

一.Linked List Cycle Total Accepted: 85115 Total Submissions: 232388 Difficulty: Medium Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space?  (M) Linked List Cycle II   /** * Definition for sing…

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? Subscribe to see which companies asked this question 查看是否有环,快慢两…

1.Linked List Cycle 题目链接 题目要求: Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 刚看到这道题,很容易写出下边的程序: bool hasCycle(ListNode *head) { ListNode *a = head, *b = head; while(a) { b = a->next; wh…

Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull. Follow up: 思路: 1)同linked-list-cycle-i一题,使用快慢指针方法,判定是否存在环,并记录两指针相遇位置(Z): 2)将两指针分别放在链表头(X)和相遇位置(Z),并改为相同速度推进,则两指针在环开始位置相遇(Y). 证明如下: 如下图所示,X,Y,Z分别为链表起始位置,环开始位…

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: ListNode *detectCycle(ListNode *head) { ListNode *p1, *p2; //p1和p2从链表的第一个节点出发,p1每次移动一…

Total Accepted: 53721 Total Submissions: 180705 Difficulty: Easy Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: A: a1 → a2 ↘ c1 → c2 → c3 ↗ B: b1 → b2 → b3 be…

http://www.geeksforgeeks.org/merge-sort-for-linked-list/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map> #incl…