LeetCode 83 Remove Duplicates from Sorted List

 1 /**
 2  * Definition for singly-linked list.
 3  * struct ListNode {
 4  *     int val;
 5  *     ListNode *next;
 6  *     ListNode(int x) : val(x), next(NULL) {}
 7  * };
 8  */
 9 class Solution {
10 public:
11     ListNode* deleteDuplicates(ListNode* head) {
12         if (!head) {
13             return head;
14         }
15         
16         ListNode *tmp = head;
17         while (tmp->next != NULL) {
18             ListNode *p = tmp->next;
19             if (tmp->val == p->val) {
20                 tmp->next = p->next;
21                 delete p;
22             }
23             else {
24                 tmp = tmp->next;
25             }
26         }
27         
28         return head;
29     }
30 };