141. Linked List Cycle
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Given a linked list, determine if it has a cycle in it.
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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