leetcode-83-Remove Duplicates from Sorted List

问题

思路

代码

/**
* 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) {
if(!head)
return NULL;
ListNode* pre = head;
ListNode* p = head->next;
while(p){
if(pre->val == p->val){
pre->next = p->next;
delete p;
p = pre->next;
}
else{
pre = p;
p = p->next;
}
}
return head;
}
};