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简单的排列计数
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ID
11609
Time
1200ms
Memory
256MiB
Difficulty
6
Tags
动态规划 DP
数学
O2优化
动态规划优化
组合数学
排列组合
Stirling 数
生成函数
快速傅里叶变换 FFT
快速数论变换 NTT
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