83. 删除排序链表中的重复元素

/**
 * 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 *start = new ListNode(0);
        start = head;
        if(start == NULL)return head;
        while(start->next)
        {
            if(start->val == start->next->val)
                start->next = start->next->next;
            else
                start = start->next;
        }
        return head;
    }
};