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LeetCode--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?
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: bool hasCycle(ListNode *head) { if(head == NULL || head->next == NULL) return false; ListNode* slow = head; ListNode* fast = head; while(fast!=NULL && fast->next!=NULL) { slow = slow->next; fast = fast->next; fast = fast->next; if(slow == fast) return true; } return false; } };
LeetCode--Linked List Cycle
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