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
.
思路1:建立一个map,key为node的节点值,val为该值出现的次数,先扫描整个链表,建立map;再重新扫描链表,同时判断该值出现的次数,如果为1,则加入返回的链表中,否则不添加。该思路的空间复杂度为O(n),时间复杂度为O(n)。
思路2:直接在原始链表上做调整,通过一个pre指向当前节点的前置指点,在判断该节点是否只出现一次,程序如下所示:
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */class Solution { public ListNode deleteDuplicates(ListNode head) { ListNode tmp = null; if (head != null){ tmp = new ListNode(head.val); } else { return tmp; } if (head.next == null){ return head; } ListNode ret = tmp, pre = head; head = head.next; boolean tag = false; while (head != null){ if (head.val == pre.val){ tag = true; } else { if (!tag){ tmp.next = pre; tmp = tmp.next; } tag = false; } pre = head; head = head.next; } tmp.next = tag?null:pre; return ret.next; }}
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- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
- 82. Remove Duplicates from Sorted List II
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