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更简单的排列计数
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ID
6456
Time
800ms
Memory
500MiB
Difficulty
9
Tags
动态规划,dp
数学
递推
O2优化
置换
组合数学
排列组合
前缀和
二项式定理
生成函数,GF
线性递推
微积分初步
导数
快速傅里叶变换 FFT
快速数论变换 NTT
# Submissions
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0
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Hydro
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