LeetCode（82）Remove Duplicates from Sorted List

题目

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.

分析

该题目与LeetCode 83题目类似，都是删除链表中重复元素的题目。
该题目要求只保存不重复的结点！

详细见代码！

AC代码

class Solution {public:    ListNode *deleteDuplicates(ListNode *head) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        if (head == NULL || head->next == NULL)            return head;        ListNode * p = head;        while (p->next != NULL && p->val == p->next->val)        {            p = p->next;        }        //保存结点        ListNode *r = p->next;        //如果头结点是重复的        if (p != head){            while (head != r)            {                ListNode * tmp = head;                head = head->next;                free(tmp);            }            return deleteDuplicates(head);        }        //否则递归处理接下来的结点        head->next = deleteDuplicates(head->next);        return head;    }};

GitHub测试程序源码