LeetCode——Remove Duplicates from Sorted List

Remove Duplicates from Sorted List

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.

Java代码：

/**
 * 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)return null;
        if(head.next == null)return head;
        
        ListNode tmp = new ListNode(0);
        tmp = head;
        while(tmp.next !=null)
        {
            if(tmp.next.val == tmp.val)
                tmp.next = tmp.next.next;
            else{
                tmp = tmp.next;
            }
        }
        return head;
    }
}