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leetcode--Remove Duplicates from Sorted List

2024-07-07 02:20:21   222人阅读

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.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if(head != null){
            ListNode currentFirst = head;
            ListNode currentNode = head.next;
            while(currentNode != null){
                if(currentFirst.val != currentNode.val){
                    currentFirst.next = currentNode;
                    currentFirst = currentFirst.next;
                }
                currentNode = currentNode.next;
            }
            if(currentFirst.next != null)
                currentFirst.next = null;
        }
        return head;   
    }
}

　　


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