141. Linked List Cycle 判斷鏈表是否有環
阿新 • • 發佈:2017-09-12
nbsp span code ext col linked solution tno return
class Solution { public: bool hasCycle(ListNode *head) { if(head == NULL) return false; if(head->next == NULL) return false; ListNode* p1 = head; ListNode* p2 = head; p1 = p1->next; p2 = p2->next->next;while(p2 != NULL && p2->next != NULL && p2->next->next != NULL && p1 != p2){ p1 = p1->next; p2 = p2->next->next; } if(p1 == p2) return true; else return false; } };
141. Linked List Cycle 判斷鏈表是否有環