LeetCode 83. Remove Duplicates from Sorted List

83. Remove Duplicates from Sorted List

Description

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. 

Solution

• 题意即给定一个排好序的链表数组，让你把其中重复的数字删除至只剩一个。
• 这是一个变相的删除节点程序，只需要对和前一个节点相同的节点删除即可，代码如下

class Solution {public:    ListNode* deleteDuplicates(ListNode* head) {        if (!head) return NULL;        ListNode *pre = head,*cur;        cur = head->next;        while (cur) {            if (pre->val == cur->val) {                pre->next = cur->next;            }            else {                pre = pre->next;            }            cur = cur->next;        }        return head;    }};