LeetCode 141: Linked List Cycle
2015-04-07 19:19
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题目描述:
Given a linked list, determine if it has a cycle in it.
Follow up:
Can you solve it without using extra space?
思路:
此题目要求为判断一个链表是否有环,这应该说是一个经典的面试题目。只需要两个指针,一个走的快,一个走的慢,看慢的能不能追上快的,如果追上了那么就是有环的,否则走到链表的结尾那么就是没有环。
Given a linked list, determine if it has a cycle in it.
Follow up:
Can you solve it without using extra space?
思路:
此题目要求为判断一个链表是否有环,这应该说是一个经典的面试题目。只需要两个指针,一个走的快,一个走的慢,看慢的能不能追上快的,如果追上了那么就是有环的,否则走到链表的结尾那么就是没有环。
class Solution { public: bool hasCycle(ListNode *head) { if(!head) return false; ListNode *p = head; ListNode *q = head->next; while(p!=q&&p!=NULL&&q!=NULL){ p = p->next; q = q->next; if(q!=NULL) q = q->next; else return false; } if(p==q) return true; return false; } };
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