AtCoder Grand Contest 036
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Problem Statement
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Given is an integer $N$. How many permutations $(P_0,P_1,\cdots,P_{2N-1})$ of $(0,1,\cdots,2N-1)$ satisfy the following condition?
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- For each
$i$$(0 \leq i \leq 2N-1)$,$N^2 \leq i^2+P_i^2 \leq (2N)^2$holds.
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Since the number can be enormous, compute it modulo $M$.
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Constraints
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$1 \leq N \leq 250$$2 \leq M \leq 10^9$- All values in input are integers.
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Input
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Input is given from Standard Input in the following format:
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N M
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Output
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Print the number of permutations that satisfy the condition, modulo $M$.
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样例
Input #1
2 998244353
Output #1
4
Four permutations satisfy the condition:
- $(2,3,0,1)$
- $(2,3,1,0)$
- $(3,2,0,1)$
- $(3,2,1,0)$
Input #2
10 998244353
Output #2
53999264
Input #3
200 998244353
Output #3
112633322
题目信息
题面与样例版权归 AtCoder 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。