摘要：原题 You are given an array of nn integers \(a1, a2, ..., an\), and a set bb of kk distinct integers from $1$ to \(n\). In one operation, you may choose 阅读全文

摘要：原题 You are given a matrix aa of size n×mn×m consisting of integers. You can choose no more than \(⌊\frac{m}{2}⌋\) elements in each row. Your task is t 阅读全文

摘要：原题 This year Alex has finished school, and now he is a first-year student of Berland State University. For him it was a total surprise that even thoug 阅读全文