Problem 83

Remove Duplicates from Sorted List

Posted by Ruizhi Ma on August 11, 2019

问题描述

https://leetcode.com/problems/remove-duplicates-from-sorted-list/

解决思路

如果当前节点的值和下一个节点的值相等,就将下个节点指向下下个节点;否则将当前节点指向下个节点。

代码

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        //corner case
        if(head == null) return head;
        
        ListNode list = head;
        while(list != null && list.next != null){
            if(list.val == list.next.val){
                list.next = list.next.next;
            }else{
                list = list.next;
            }
        }
        
        return head;
    }
}

复杂度分析

  1. 时间复杂度:O(n)
  2. 空间复杂度:O(1)