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Problem Description 单身! 依然单身！ 吉哥依然单身！ DS级码农吉哥依然单身！ 所以，他生平最恨情人节，不管是214还是77，他都讨厌！ 吉哥观察了214和77这两个数，发现： 2+1+4=7 7+7=7*2 77=7*11... 阅读全文
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Problem DescriptionA wqb-number, or B-number for short, is a non-negative integer whose decimal form contains the sub- string "13" and... 阅读全文
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DescriptionThe cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, ... 阅读全文
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Problem DescriptionGiven two matrices A and B of size n×n, find the product of them.bobo hates big integers. So you are only asked to ... 阅读全文
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DescriptionYou are given N sets, the i-th set (represent by S(i)) have C(i) element (Here "set" isn't entirely the same as the "set" d... 阅读全文
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You're given a matrix A of size n × n.Let's call the matrix with nonnegative elements magic if it is symmetric (so aij = aji), aii = 0... 阅读全文
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A thief made his way to a shop.As usual he has his lucky knapsack with him. The knapsack can contain k objects. There are n kinds of p... 阅读全文
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You are given array a with n elements and the number m. Consider some subsequence of a and the value of least common multiple (LCM) of... 阅读全文
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You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order such that the resulting string... 阅读全文
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Problem DescriptionCRB has N different candies. He is going to eat K candies.He wonders how many combinations he can select.Can you an... 阅读全文