Leetcode: Remove Duplicates from Sorted List

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;    }};