083.Remove Duplicates from Sorted List

Solution 1: accepted 1ms

pointer - slow
next - fast

public ListNode deleteDuplicates(ListNode head) {
    ListNode pointer = head;
    while (pointer != null) {
        ListNode next = pointer.next;
        while (next != null && pointer.val == next.val) {
            next = next.next;
        }
        pointer.next = next;
        pointer = pointer.next;
    }
    return head;
}