摘要：
母函数，又称生成函数。 母函数就是一列用来展示一串数字的挂衣架。 ——赫伯特·唯尔夫 。 母函数问题一般是，对于一个问题，抽象出一个生成函数。 以换硬币问题为例，有一元的，四元的，九元的........硬币无数个，问y元钱有几种组合方式。 设一个数的指数为y（组成y元钱），系数为有几种组合方式，开始 阅读全文
posted @ 2018-10-06 10:45
Daybreaking
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On the way to school, Karen became fixated on the puzzle game on her phone! The game is played as follows. In each level, you have a grid with n rows 阅读全文
posted @ 2018-10-06 10:08
Daybreaking
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To stay woke and attentive during classes, Karen needs some coffee! Karen, a coffee aficionado, wants to know the optimal temperature for brewing the 阅读全文
posted @ 2018-10-06 09:42
Daybreaking
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