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Helen works in Metropolis airport. She is responsible for creating a departure schedule. There are n flights that must depart today, the i-th of them 阅读全文
posted @ 2017-09-07 18:51
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Maxim wants to buy an apartment in a new house at Line Avenue of Metropolis. The house has n apartments that are numbered from 1 to nand are arranged 阅读全文
posted @ 2017-09-07 12:50
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Petya is a big fan of mathematics, especially its part related to fractions. Recently he learned that a fraction is called proper iff its numerator is 阅读全文
posted @ 2017-09-07 11:54
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