LeetCode 82. Remove Duplicates from Sorted List II
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Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
For example,
Given 1->2->3->3->4->4->5
, return 1->2->5
.
Given 1->1->1->2->3
, return 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 newHead(0); ListNode* pre_pre = &newHead; ListNode* pre = head; ListNode* cur = head->next; bool flag_same = false; while(cur != NULL) { if (cur->val != pre->val) { if (flag_same == false) { pre_pre->next = pre; pre_pre = pre; } else { flag_same = false; } pre = cur; } else { flag_same = true; } cur = cur->next; } if (flag_same == true) { pre_pre->next = NULL; } else { pre_pre->next = pre; } return newHead.next; }};
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