#P9186. Yet Another Easy Permutation Count Problem

    ID: 5269 传统题 15000ms 256MiB 尝试: 3 已通过: 2 难度: 9 上传者: 标签>CF2600组合数学树状数组数学数据结构前缀和计数DP2022

Yet Another Easy Permutation Count Problem

Source: Super League of Chinese College Students Algorithm Design 2022, Contest 6 by TJU.

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