CF1914G1.Light Bulbs (Easy Version)

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题目描述

The easy and hard versions of this problem differ only in the constraints on nn. In the easy version, the sum of values of n2n^2 over all test cases does not exceed 10610^6. Furthermore, nn does not exceed 10001000 in each test case.

There are 2n2n light bulbs arranged in a row. Each light bulb has a color from 11 to nn (exactly two light bulbs for each color).

Initially, all light bulbs are turned off. You choose a set of light bulbs SS that you initially turn on. After that, you can perform the following operations in any order any number of times:

  • choose two light bulbs ii and jj of the same color, exactly one of which is on, and turn on the second one;
  • choose three light bulbs i,j,ki, j, k, such that both light bulbs ii and kk are on and have the same color, and the light bulb jj is between them (i<j<ki \lt j \lt k), and turn on the light bulb jj.

You want to choose a set of light bulbs SS that you initially turn on in such a way that by performing the described operations, you can ensure that all light bulbs are turned on.

Calculate two numbers:

  • the minimum size of the set SS that you initially turn on;
  • the number of sets SS of minimum size (taken modulo 998244353998244353).

本题的简单版本与困难版本仅在 nn 的约束条件上有所不同。在简单版本中,所有测试用例的 n2n^2 值之和不超过 10610^6;此外,每个测试用例中 nn 不超过 10001000。

有 2n2n 个灯泡排成一行。每个灯泡的颜色为 11 到 nn 中的一个(每种颜色恰好对应两个灯泡)。

初始时,所有灯泡均处于关闭状态。你需要选择一个灯泡集合 SS,并将其中所有灯泡初始设为开启状态。此后,你可以以任意顺序、任意次数执行以下两种操作:

  • 选择两个同色灯泡 ii 和 jj,其中恰好有一个是开启的,然后将另一个开启;
  • 选择三个灯泡 i,j,ki, j, k,满足:灯泡 ii 和 kk 均为开启状态且颜色相同,且灯泡 jj 位于它们之间(即 i<j<ki \lt j \lt k),然后将灯泡 jj 开启。

你的目标是选择一个初始开启的灯泡集合 SS,使得通过执行上述操作,最终能确保所有灯泡均被开启。

请计算以下两个数值:

  • 初始开启集合 SS 的最小可能大小;
  • 具有该最小大小的集合 SS 的个数(对 998244353998244353 取模)。

输入格式

The first line of the input contains a single integer tt (1≤t≤1041 \le t \le 10^4) — the number of test cases. Then follow the descriptions of the test cases.

The first line of each test case contains a single integer nn (2≤n≤10002 \le n \le 1000) — the number of pairs of light bulbs.

The second line of each test case contains 2n2n integers c1,c2,…,c2nc_1, c_2, \dots, c_{2n} (1≤ci≤n1 \le c_i \le n), where cic_i is the color of the ii-th light bulb. For each color from 11 to nn, exactly two light bulbs have this color.

Additional constraint on the input: the sum of values of n2n^2 over all test cases does not exceed 10610^6.

输入的第一行包含一个整数 tt(1≤t≤1041 \le t \le 10^4),表示测试用例的数量。随后是各测试用例的描述。

每个测试用例的第一行包含一个整数 nn(2≤n≤10002 \le n \le 1000),表示灯泡对的数量。

每个测试用例的第二行包含 2n2n 个整数 c1,c2,…,c2nc_1, c_2, \dots, c_{2n}(1≤ci≤n1 \le c_i \le n),其中 cic_i 表示第 ii 个灯泡的颜色。对于从 11 到 nn 的每种颜色,恰好有两个灯泡具有该颜色。

输入的附加约束:所有测试用例中 n2n^2 的值之和不超过 10610^6。

输出格式

For each test case, output two integers:

  • the minimum size of the set SS that you initially turn on;
  • the number of sets SS of minimum size (taken modulo 998244353998244353).

对每个测试用例,输出两个整数:

  • 你最初需要开启的集合 SS 的最小大小;
  • 大小为该最小值的集合 SS 的个数(对 998244353998244353 取模)。

输入输出样例

  • 输入#1

    4
    2
    2 2 1 1
    2
    1 2 2 1
    2
    1 2 1 2
    5
    3 4 4 5 3 1 1 5 2 2

    输出#1

    2 4
    1 2
    1 4
    2 8

输入解题思路,AI测评打分。不知道怎么写?

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