/** * struct ListNode { * int val; * struct ListNode *next; * }; */ /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param head ListNode类 * @return ListNode类 */ struct ListNode* deleteDuplicates(struct ListNode* head ) { if(head == NULL) { return head; } struct ListNode* fast=head->next; struct ListNode* slow=head; while(fast != NULL) { //如果两个结点的值相等 if(fast->val == slow->val) { slow->next=fast->next; free(fast); fast=slow->next; } else //如果不相等 { fast=fast->next; slow=slow->next; } } return head; }