leetcode - Remove Duplicates from Sorted List

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：从头开始比较前后两个的值，相同便删除后一个

class Solution {public:    ListNode *deleteDuplicates(ListNode *head) {        if(head == NULL)return NULL;                ListNode *cur = head;        while(cur->next)        {            if(cur->val == cur->next->val)            {                ListNode *temp = cur->next;                cur->next = cur->next->next;                delete temp;            }            else cur = cur->next;        }                return head;    }};