【LeetCode 83】Remove Duplicates from Sorted List

题目描述

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

Example 1:

Input: 1->1->2
Output: 1->2

Example 2:

Input: 1->1->2->3->3
Output: 1->2->3

代码

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        ListNode* phead = head;
        while(phead != NULL) {
            ListNode* cur = phead;
            while(cur != NULL && cur->val == phead->val) {
                cur = cur->next;
            }
            phead->next = cur;
            phead = phead->next;
        } 
        return head;
    }
};