LeetCode_remove-duplicates-from-sorted-list

原题链接：https://leetcode.com/problems/remove-duplicates-from-sorted-list/

思路：从链表尾部开始；class Solution {public:    ListNode* deleteDuplicates(ListNode* head) {        ListNode* p;        if(!head)            return nullptr;        p = deleteDuplicates(head->next);        if(p)        {            if(head->val == p->val)            {                head->next = p->next;            }        }        return head;    }};