LeetCode 83 -Remove Duplicates from Sorted List ( JAVA )

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

.

/**
* 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) {
if(head == null || head.next == null) return head;
ListNode ls = head;
while(head.next != null){
if(head.val == head.next.val){
head.next = head.next.next;
}else{
head = head.next;
}
}
return ls;
}
}



总结：主要就是一个循环比较值，没什么难度，就是要注意不要有空指针的情况出现。