Linked List Cycle(2014.2.7)
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/**
* 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) {
ListNode *p=head;
ListNode *q=head;
while(q!=NULL&&q->next!=NULL){
p=p->next;
q=q->next->next;
if(p==q) return true;
}
return false;
}
};
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