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D. Roads in Yusland standard output D. Roads in Yusland standard output Mayor of Yusland just won the lottery and decided to spent money on something 阅读全文
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E. Boredom E. Boredom Ilya is sitting in a waiting area of Metropolis airport and is bored of looking at time table that shows again and again that hi 阅读全文
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苹果是否相同（n个苹果） 袋子是否相同（m个袋子） 答案 是 是 DP（详见放苹果） 是 否 否 是 m^n/m! 否 否 m^n 阅读全文