ViKyanite.

摘要： 最近做题的时候，经常遇到范围是2^63，取模2^64的这种题目。遇到这种限制条件时就要想到用unsigned long long类型。 可以简洁地声明为typedef unsigned long long ull。这样，如果ull类型的整数溢出了，就相当于取模2^64了。因为ull的范围是[0,2^ 阅读全文

摘要： Farmer John knows that an intellectually satisfied cow is a happy cow who will give more milk. He has arranged a brainy activity for cows in which the 阅读全文