[Leetcode]83.Remove Duplicates from Sorted List

[leetcode] 83. Remove Duplicates from Sorted List

题目连接：https://leetcode.com/problems/remove-duplicates-from-sorted-list/

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.

思路

单链表删除

/** * Definition for singly-linked list. * struct ListNode { *     int val; *     ListNode *next; *     ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public:    ListNode* deleteDuplicates(ListNode* head) {        if(head == NULL) return NULL;        int old = head->val;         ListNode *p = head;        while(p->next){            if(p->next->val == old){                ListNode* q= p->next;                p->next = q->next;                delete q;            }            else{                old = p->next->val;                p = p->next;            }        }        return head;    }};