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Harmonic Number In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this problem, you are given n 阅读全文
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Leading and Trailing You are given two integers: n and k, your task is to find the most significant three digits, and least significant three digits o 阅读全文
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Mathematically Hard Mathematically some problems look hard. But with the help of the computer, some problems can be easily solvable. In this problem, 阅读全文
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Bi-shoe and Phi-shoe Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs 阅读全文