http://oj.leetcode.com/problems/remove-duplicates-from-sorted-list/
/**
* 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) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
if(head==NULL) return head;
while(head->next!=NULL&&head->val==head->next->val){
head->next=head->next->next;
}
deleteDuplicates(head->next);
return head;
}
};