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C. Coprime Sequence题目链接Problem Description Do you know what is called Coprime Sequence”? That is a sequence consists of n positive integers, and the GCD (Greatest Common Divisor) of them is equ...

题目链接An Olympian Math ProblemAlice, a student of grade 66, is thinking about an Olympian Math problem, but she feels so despair that she cries. And her classmate, Bob, has no idea about the problem...

2016-2017 ACM-ICPC Northwestern European Regional Programming Contest (NWERC 2016)Problem I Iron and Coal题目链接：http://codeforces.com/gym/101170/attachmentsThere are many excellent strategy board gam...