Codeforces Round 953 (Div. 2)
C
Manhattan Permutations
Codeforces
1300
原题
← BD →
翻译中…

Let's call the Manhattan value of a permutation$^{\dagger}$ $p$ the value of the expression $|p_1 - 1| + |p_2 - 2| + \ldots + |p_n - n|$.

翻译中…

For example, for the permutation $[1, 2, 3]$, the Manhattan value is $|1 - 1| + |2 - 2| + |3 - 3| = 0$, and for the permutation $[3, 1, 2]$, the Manhattan value is $|3 - 1| + |1 - 2| + |2 - 3| = 2 + 1 + 1 = 4$.

翻译中…

You are given integers $n$ and $k$. Find a permutation $p$ of length $n$ such that its Manhattan value is equal to $k$, or determine that no such permutation exists.

翻译中…

$^{\dagger}$A permutation of length $n$ is an array consisting of $n$ distinct integers from $1$ to $n$ in arbitrary order. For example, $[2,3,1,5,4]$ is a permutation, but $[1,2,2]$ is not a permutation ($2$ appears twice in the array), and $[1,3,4]$ is also not a permutation ($n=3$ but there is $4$ in the array).

翻译中…

Input

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Each test consists of multiple test cases. The first line contains a single integer $t$ ($1 \leq t \leq 10^{4}$) — the number of test cases. The description of the test cases follows.

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The only line of each test case contains two integers $n$ and $k$ ($1 \le n \le 2 \cdot 10^{5}, 0 \le k \le 10^{12}$) — the length of the permutation and the required Manhattan value.

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It is guaranteed that the sum of $n$ over all test cases does not exceed $2 \cdot 10^{5}$.

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Output

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For each test case, if there is no suitable permutation, output "No". Otherwise, in the first line, output "Yes", and in the second line, output $n$ distinct integers $p_1, p_2, \ldots, p_n$ ($1 \le p_i \le n$) — a suitable permutation.

翻译中…

If there are multiple solutions, output any of them.

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You can output the answer in any case (for example, the strings "yEs", "yes", "Yes", and "YES" will be recognized as a positive answer).

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Note

翻译中…

In the first test case, the permutation $[3, 1, 2]$ is suitable, its Manhattan value is $|3 - 1| + |1 - 2| + |2 - 3| = 2 + 1 + 1 = 4$.

翻译中…

In the second test case, it can be proven that there is no permutation of length $4$ with a Manhattan value of $5$.

翻译中…

In the third test case, the permutation $[1,2,3,4,5,6,7]$ is suitable, its Manhattan value is $|1-1|+|2-2|+|3-3|+|4-4|+|5-5|+|6-6|+|7-7|=0$.

翻译中…

样例

Input #1
8
3 4
4 5
7 0
1 1000000000000
8 14
112 777
5 12
5 2
Output #1
Yes
3 1 2
No
Yes
1 2 3 4 5 6 7
No
Yes
8 2 3 4 5 6 1 7
No
Yes
5 4 3 1 2
Yes
2 1 3 4 5
InputCopy OutputCopy
题目信息
题号
1978C
时间限制
2 s
内存限制
256 MB
标签
构造
数据结构
贪心
模拟
数学

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。