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。
CF1777B.Emordnilap
Emordnilap
A permutation of length 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). There are $n! = n \cdot (n-1) \cdot (n - 2) \cdot \ldots \cdot 1$ different permutations of length .
Given a permutation of numbers, we create an array consisting of numbers, which is equal to concatenated with its reverse. We then define the beauty of as the number of inversions in .
The number of inversions in the array is the number of pairs of indices , such that and .
For example, for permutation , would be . The inversions in are and (assuming 1-based indexing). Hence, the beauty of is .
Your task is to find the sum of beauties of all permutations of size . Print the remainder we get when dividing this value by ().
Input
Each test contains multiple test cases. The first line contains the number of test cases (). The description of the test cases follows.
Each test case has only one line — the integer ().
It is guaranteed that the sum of over all test cases does not exceed .
Output
For each test case, print one integer — the sum of beauties of all permutations of size modulo ().
Note
For the first test case of the example, is the only permutation. has inversions.
For the second test case of the example, the permutations are and . Their respective arrays are and , both of which have inversions.
Samples
3
1
2
100
0
4
389456655
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 |