CF1265B.Beautiful Numbers

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题目描述

You are given a permutation p=[p1,p2,…,pn]p=[p_1, p_2, \ldots, p_n] of integers from 11 to nn. Let's call the number mm (1≤m≤n1 \le m \le n) beautiful, if there exists two indices l,rl, r (1≤l≤r≤n1 \le l \le r \le n), such that the numbers [pl,pl+1,…,pr][p_l, p_{l+1}, \ldots, p_r] is a permutation of numbers 1,2,…,m1, 2, \ldots, m.

For example, let p=[4,5,1,3,2,6]p = [4, 5, 1, 3, 2, 6]. In this case, the numbers 1,3,5,61, 3, 5, 6 are beautiful and 2,42, 4 are not. It is because:

  • if l=3l = 3 and r=3r = 3 we will have a permutation [1][1] for m=1m = 1;
  • if l=3l = 3 and r=5r = 5 we will have a permutation [1,3,2][1, 3, 2] for m=3m = 3;
  • if l=1l = 1 and r=5r = 5 we will have a permutation [4,5,1,3,2][4, 5, 1, 3, 2] for m=5m = 5;
  • if l=1l = 1 and r=6r = 6 we will have a permutation [4,5,1,3,2,6][4, 5, 1, 3, 2, 6] for m=6m = 6;
  • it is impossible to take some ll and rr, such that [pl,pl+1,…,pr][p_l, p_{l+1}, \ldots, p_r] is a permutation of numbers 1,2,…,m1, 2, \ldots, m for m=2m = 2 and for m=4m = 4.

You are given a permutation p=[p1,p2,…,pn]p=[p_1, p_2, \ldots, p_n]. For all mm (1≤m≤n1 \le m \le n) determine if it is a beautiful number or not.

给你一个 11 到 nn 的整数排列 p=[p1,p2,…,pn]p=[p_1, p_2, \ldots, p_n]。我们称一个数 mm(1≤m≤n1 \le m \le n)是优美的,如果存在两个下标 l,rl, r(1≤l≤r≤n1 \le l \le r \le n),使得子数组 [pl,pl+1,…,pr][p_l, p_{l+1}, \ldots, p_r] 恰好是 1,2,…,m1, 2, \ldots, m 的一个排列。

例如,设 p=[4,5,1,3,2,6]p = [4, 5, 1, 3, 2, 6]。此时,数字 1,3,5,61, 3, 5, 6 是优美的,而 2,42, 4 不是。原因如下:

  • 当 l=3l = 3 且 r=3r = 3 时,得到子数组 [1][1],它是 1,2,…,11, 2, \ldots, 1(即 [1][1])的一个排列,故 m=1m = 1 是优美的;
  • 当 l=3l = 3 且 r=5r = 5 时,得到子数组 [1,3,2][1, 3, 2],它是 1,2,…,31, 2, \ldots, 3(即 [1,2,3][1,2,3])的一个排列,故 m=3m = 3 是优美的;
  • 当 l=1l = 1 且 r=5r = 5 时,得到子数组 [4,5,1,3,2][4, 5, 1, 3, 2],它是 1,2,…,51, 2, \ldots, 5(即 [1,2,3,4,5][1,2,3,4,5])的一个排列,故 m=5m = 5 是优美的;
  • 当 l=1l = 1 且 r=6r = 6 时,得到子数组 [4,5,1,3,2,6][4, 5, 1, 3, 2, 6],它是 1,2,…,61, 2, \ldots, 6(即 [1,2,3,4,5,6][1,2,3,4,5,6])的一个排列,故 m=6m = 6 是优美的;
  • 不存在任何 ll 和 rr,使得 [pl,pl+1,…,pr][p_l, p_{l+1}, \ldots, p_r] 是 1,2,…,m1, 2, \ldots, m 的排列,当 m=2m = 2 或 m=4m = 4 时。

给你一个排列 p=[p1,p2,…,pn]p=[p_1, p_2, \ldots, p_n]。对每个 mm(1≤m≤n1 \le m \le n),判断它是否为优美的数。

输入格式

The first line contains the only integer tt (1≤t≤10001 \le t \le 1000) — the number of test cases in the input. The next lines contain the description of test cases.

The first line of a test case contains a number nn (1≤n≤2⋅1051 \le n \le 2 \cdot 10^5) — the length of the given permutation pp. The next line contains nn integers p1,p2,…,pnp_1, p_2, \ldots, p_n (1≤pi≤n1 \le p_i \le n, all pip_i are different) — the given permutation pp.

It is guaranteed, that the sum of nn from all test cases in the input doesn't exceed 2⋅1052 \cdot 10^5.

第一行包含一个整数 tt(1≤t≤10001 \le t \le 1000)—— 输入中测试用例的数量。接下来的行描述各测试用例。

每个测试用例的第一行包含一个整数 nn(1≤n≤2⋅1051 \le n \le 2 \cdot 10^5)—— 给定排列 pp 的长度。下一行包含 nn 个整数 p1,p2,…,pnp_1, p_2, \ldots, p_n(1≤pi≤n1 \le p_i \le n,且所有 pip_i 互不相同)—— 给定的排列 pp。

保证输入中所有测试用例的 nn 值之和不超过 2⋅1052 \cdot 10^5。

输出格式

Print tt lines — the answers to test cases in the order they are given in the input.

The answer to a test case is the string of length nn, there the ii-th character is equal to 11 if ii is a beautiful number and is equal to 00 if ii is not a beautiful number.

输出 tt 行——按输入中给出的顺序,对应各测试用例的答案。

每个测试用例的答案是一个长度为 nn 的字符串,其中第 ii 个字符为 11 当且仅当 ii 是一个“优美数”,否则为 00。

输入输出样例

  • 输入#1

    3
    6
    4 5 1 3 2 6
    5
    5 3 1 2 4
    4
    1 4 3 2

    输出#1

    101011
    11111
    1001

说明/提示

The first test case is described in the problem statement.

In the second test case all numbers from 11 to 55 are beautiful:

  • if l=3l = 3 and r=3r = 3 we will have a permutation [1][1] for m=1m = 1;
  • if l=3l = 3 and r=4r = 4 we will have a permutation [1,2][1, 2] for m=2m = 2;
  • if l=2l = 2 and r=4r = 4 we will have a permutation [3,1,2][3, 1, 2] for m=3m = 3;
  • if l=2l = 2 and r=5r = 5 we will have a permutation [3,1,2,4][3, 1, 2, 4] for m=4m = 4;
  • if l=1l = 1 and r=5r = 5 we will have a permutation [5,3,1,2,4][5, 3, 1, 2, 4] for m=5m = 5.

第一个测试用例已在题目描述中给出。

在第二个测试用例中,从 11 到 55 的所有数字都是优美的:

  • 若 l=3l = 3 且 r=3r = 3,则当 m=1m = 1 时,我们将得到排列 [1][1];
  • 若 l=3l = 3 且 r=4r = 4,则当 m=2m = 2 时,我们将得到排列 [1,2][1, 2];
  • 若 l=2l = 2 且 r=4r = 4,则当 m=3m = 3 时,我们将得到排列 [3,1,2][3, 1, 2];
  • 若 l=2l = 2 且 r=5r = 5,则当 m=4m = 4 时,我们将得到排列 [3,1,2,4][3, 1, 2, 4];
  • 若 l=1l = 1 且 r=5r = 5,则当 m=5m = 5 时,我们将得到排列 [5,3,1,2,4][5, 3, 1, 2, 4]。

输入解题思路,AI测评打分。不知道怎么写?

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