题解 | 牛群排列去重

1. 初始条件写好。
2. 内部小循环删除重复。

import java.util.*;

public class Solution {
    public ListNode deleteDuplicates (ListNode head) {
        if (head == null || head.next == null) {
            return head;
        }
        ListNode cur = head;
        while (cur != null) {
            final int v = cur.val;
            ListNode tmp = cur.next;
            while (tmp != null && v == tmp.val) {
                tmp = tmp.next;
            }
            cur.next = tmp;
            cur = tmp;
        }
        return head;
    }
}