分析
遇到相同的节点,就跳过。
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode() : val(0), next(nullptr) {}
* ListNode(int x) : val(x), next(nullptr) {}
* ListNode(int x, ListNode *next) : val(x), next(next) {}
* };
*/
class Solution {
public:
ListNode* deleteDuplicates(ListNode* head) {
if(!head)return head;
ListNode * dummy=new ListNode(0,head);
ListNode*cur=head;
while(cur->next){
if(cur->val==cur->next->val){
cur->next=cur->next->next;
}else cur=cur->next;
}
return dummy->next;
}
};