LeetCode-83 Remove Duplicates from Sorted List Solution (with Java)

1. Description:

2. Examples:

3.Solutions:

/**
 * Created by sheepcore on 2019-05-08
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
         if(head == null)
            return head;
        else{
            ListNode pre = head, cur = head.next;
            while (cur != null){
                if(cur.val == pre.val){
                    pre.next = cur.next;
                    cur = cur.next;
                } else{
                    pre = cur;
                    cur = cur.next;
                }
            }
        }
        return head;
        
    }
}