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N wizards are attending a meeting. Everyone has his own magic wand. N magic wands was put in a line, numbered from 1 to n(Wand_i owned by wizard_i). A 阅读全文
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Gaby is a little baby who loves playing with numbers. Recently she has learned how to add 2 numbers using the standard addition algorithm which we sum 阅读全文
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This is a very easy problem. ACMeow loves GTX1920. Now he has m RMB, but no GTX1920s. In the next n days, the unit price of GTX1920 in the ith day is 阅读全文
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Yinyangshi is a famous RPG game on mobile phones. Kim enjoys collecting cards in this game. Suppose there are n kinds of cards. If you want to get a n 阅读全文
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Tamref love random numbers, but he hates recurrent relations, Tamref thinks that mainstream random generators like the linear congruent generator suck 阅读全文
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There is a rooted tree with n nodes, number from 1-n. Root’s number is 1.Each node has a value ai. Initially all the node’s value is 0. We have q oper 阅读全文