LeetCode 83. Remove Duplicates from Sorted List
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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
.
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/** * 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 head; } ListNode* pre = head; ListNode* cur = head->next; while(cur != NULL) { if (cur->val != pre->val) { pre->next = cur; pre = cur; } cur = cur->next; } pre->next = NULL; return head; }};
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