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Helvetic Coding Contest 2018 online mirror (teams allowed, unrated)F3 - Lightsabers (hard)
時間 2020-02-02
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helvetic
coding
contest
online
mirror
teams
allowed
unrated
f3
lightsabers
hard
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題意:n個數字1-m,問取k個組成的set方案數 題解:假設某個數出現k次,那麼生成函數爲\(1+x+...+x^k\),那麼假設第i個數出現ai次,結果就是\(\sum_{i=1}^m(1+x+...+x^{a_i})\),第k項即爲答案,啓發式合併fft便可 組合(即set):普通生成函數.排列:指數型生成函數html //#pragma GCC optimize(2) //#pragma G
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