1
class Solution {
2
  public ListNode deleteDuplicates(ListNode head) {
3

4
    if (head == null) {
5
      return head;
6
    }
7

8
    ListNode result = head;
9

10
    while (result != null) {
11
      if (result.next == null) {
12
        break;
13
      }
14

15
      if (result.val == result.next.val) {
16
        result.next = result.next.next;
17
      } else {
18
        result = result.next;
19
      }
20
    }
21

22
    return head;
23
  }
24
}