摘要：
Thor is getting used to the Earth. As a gift Loki gave him a smartphone. There are n applications on this phone. Thor is fascinated by this phone. He 阅读全文
摘要：
You've decided to carry out a survey in the theory of prime numbers. Let us remind you that a prime number is a positive integer that has exactly two 阅读全文
摘要：
You are a "Problem Killer", you want to solve many problems. Now you have nn problems, the ii-th problem's difficulty is represented by an integer aia 阅读全文