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A. Forgetting Things Kolya is very absent minded. Today his math teacher asked him to solve a simple problem with the equation 𝑎+1=𝑏 with positive i 阅读全文
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D. Power Products You are given n positive integers a1,…,an, and an integer k≥2. Count the number of pairs i,j such that 1≤i using namespace std; cons 阅读全文
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C. p binary Vasya will fancy any number as long as it is an integer power of two. Petya, on the other hand, is very conservative and only likes a sing 阅读全文