欢迎来到起遇信息学
起遇信息学正处于上线筹建阶段,以下功能已全部开放免费体验: ✅ 完整题库浏览与代码提交评测(C / C++ / Python / Java 等) ✅ 入门到进阶的系列课程试读、作业与考试 ✅ AI 提示、AI 作业分析等智能助教功能 ✅ 赛事模拟与个人能力报告 ✅ 邮箱注册开放 ⏳ 付费课程订阅与微信/支付宝支付通道 ⏳ 手机号登录,微信扫码登录、微信公众号绑定 使用中如遇任何问题,欢迎通过页面底部 **"联系我们"** 与我们沟通。
CF1844B.Permutations & Primes
Permutations & Primes
You are given a positive integer .
In this problem, the of a collection of integers is defined as the smallest positive integer which does not occur in the collection .
The primality of an array is defined as the number of pairs such that and is a prime number.
Find any permutation of with the maximum possible primality among all permutations of .
Note:
- A prime number is a number greater than or equal to that is not divisible by any positive integer except and itself. For example, are prime numbers, but and are not prime numbers.
- A permutation of is an array consisting of distinct integers from to in arbitrary order. For example, is a permutation, but is not a permutation ( appears twice in the array), and is also not a permutation ( but there is in the array).
Input
Each test contains multiple test cases. The first line contains the number of test cases (). The description of the test cases follows.
The only line of each test case contains a single integer ().
It is guaranteed that the sum of over all test cases does not exceed .
Output
For each test case, output integers: a permutation of that achieves the maximum possible primality.
If there are multiple solutions, print any of them.
Note
In the first test case, there are pairs with , out of which have a prime :
- : , which is not prime.
- : , which is prime.
- : , which is prime.
Therefore, the primality is .
In the second test case, is prime, so the primality is .
In the third test case, the maximum possible primality is .
Samples
3
2
1
5
2 1
1
5 2 1 4 3
在线编程 IDE
建议全屏模式获得最佳体验
| 进入全屏编程 | Alt+E |
| 递交评测 | Ctrl+Enter |
| 注释/取消注释 | Ctrl+/ |
| 缩放字体 | Ctrl+滚轮 |