leetCode 83.Remove Duplicates from Sorted List(刪除排序連結串列的重複) 解題思路和方法
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:此題與上一題異曲同工,具體解法如下:
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ public class Solution { public ListNode deleteDuplicates(ListNode head) { ListNode first = new ListNode(0); ListNode last = first; ListNode p = head; while(head != null){ while(head.next != null){//去除重複項 if(p.val == head.next.val){ head = head.next; }else{ break; } } last.next = p;//每項只新增一個值 last = last.next; p = head = head.next; last.next = null; } return first.next; } }
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