struct ListNode* deleteDuplicates(struct ListNode* head) {
struct ListNode *p=head;
if(!head)
return head;
while(p&&p->next)
{
if(p->val==p->next->val)
p->next=p->next->next;
else
p=p->next;
} return head; }

要注意考虑1->1->1这种情况,第一个1要和后面比较多次。

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