【leetcode】Reverse Linked List（easy）

Reverse a singly linked list.

思路：没啥好说的。秒...

ListNode* reverseList(ListNode* head) {

        ListNode * rList = NULL, * tmp = NULL;

        while(head != NULL)

        {

            tmp = rList;

            rList = head;

            head = head->next;

            rList->next = tmp;

        }

        return rList;

    }