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82.cpp
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32 lines (32 loc) · 838 Bytes
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/**
* 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) {
ListNode *l1;
l1=new ListNode(0);
auto l2=l1;
while(head){
if(head->next && head->val==head->next->val){
while(head->next && head->val==head->next->val){
head=head->next;
}
head=head->next;
}else{
l1->next=head;
l1=l1->next;
head=head->next;
}
}
l1->next=NULL;
return l2->next;
}
};