思路完整代码class Solution { public: ListNode* removeNthFromEnd(ListNode* head, int n) { ListNode* dummyHead new ListNode(0); dummyHead-next head; ListNode* fast dummyHead; ListNode* slow dummyHead; n; while(n-- fast ! NULL){ fast fast -next; } while (fast ! NULL){ fast fast-next; slow slow-next; } slow-next slow-next-next; return dummyHead-next; } };