题目链接：Remove Duplicates from Sorted List
题面：
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.
struct ListNode {
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
class Solution {
public:
ListNode* deleteDuplicates(ListNode* head) {
if(head==NULL)return head;
ListNode* newHead = head;
ListNode* curr = head->next;
ListNode* tmp;
while( curr != NULL )
{
if( curr->val != head->val )
{
curr = curr->next;
head = head->next;
}
else
{
tmp=curr;
curr = curr->next;
head->next=curr;
delete tmp;
}
}
return newHead;
}
};
LeetCode Remove Duplicates from Sorted List
原文：http://blog.csdn.net/david_jett/article/details/45938579