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问题描述 Sonya likes ice cream very much. She eats it even during programming competitions. That is why the girl decided that she wants to open her own ic 阅读全文
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问题描述 Recently Lynyrd and Skynyrd went to a shop where Lynyrd bought a permutation p of length n, and Skynyrd bought an array a of length mm, consistin 阅读全文
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问题描述 Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only if it is divisibl 阅读全文