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SuperMemo Your friend, Jackson is invited to a TV show called SuperMemo in which the participant is told to play a memorizing game. At first, the host 阅读全文
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gcd Little White learned the greatest common divisor, so she plan to solve a problem: given \(x, n,\) query \(\sum_{a=1}^n\sum_{b=1}^ngcd(x^a−1,x^b−1) 阅读全文
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Calculation 2 Given a positive integer N, your task is to calculate the sum of the positive integers less than N which are not coprime to N. A is said 阅读全文
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GCD The greatest common divisor GCD(a,b) of two positive integers a and b,sometimes written (a,b),is the largest divisor common to a and b,For example 阅读全文