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Problem Destribe Little D is really interested in the theorem of sets recently. There’s a problem that confused him a long time. Let T be a set of int 阅读全文
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Problem Describe Ryuji is not a good student, and he doesn’t want to study. But there are n books he should learn, each book has its knowledge a[i]a[i 阅读全文
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Problem Describe 第二次世界大战时期,英国皇家空军从沦陷国征募了大量外籍飞行员。由皇家空军派出的每一架飞机都需要配备在航行技能和语言上能互相配合的2名飞行员,其中1名是英国飞行员,另1名是外籍飞行员。在众多的飞行员中,每一名外籍飞行员都可以与其他若干名英国飞行员很好地配合。如何选择配 阅读全文
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Problem Description Dr. Ellie Arroway has established contact with an extraterrestrial civilization. However, all efforts to decode their messages hav 阅读全文
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A square-free integer is an integer which is indivisible by any square number except 11. For example, 6 = 2 \cdot 36=2⋅3 is square-free, but 12=22∗312 阅读全文