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You are given positive integer number n. You should create such strictly increasingsequence of k positive numbers a1, a2, ..., ak, that their sum is e 阅读全文
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描述 Given an N*N matrix, find the coolest square sub-matrix.We define the cool value of the square matrix as X-Y where X indicating the sum of all inte 阅读全文
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Sheila is a student and she drives a typical student car: it is old, slow, rusty, and falling apart. Recently, the needle on the speedometer fell off. 阅读全文
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描述 Given an N-digit number, you should remove K digits and make the new integer as large as possible. Given an N-digit number, you should remove K dig 阅读全文