摘要：
链接: https://codeforces.com/contest/1216/problem/B 题意: Recently Vasya decided to improve his pistol shooting skills. Today his coach offered him the fo 阅读全文
摘要：
链接: https://codeforces.com/contest/1216/problem/A 题意: Nikolay got a string s of even length n, which consists only of lowercase Latin letters 'a' and 阅读全文
摘要：
链接: https://codeforces.com/contest/1230/problem/E 题意: Kamil likes streaming the competitive programming videos. His MeTube channel has recently reache 阅读全文
摘要：
链接: https://codeforces.com/contest/1230/problem/D 题意: Marcin is a coach in his university. There are n students who want to attend a training camp. Ma 阅读全文
摘要：
链接: https://codeforces.com/contest/1230/problem/C 题意: Anadi has a set of dominoes. Every domino has two parts, and each part contains some dots. For e 阅读全文
摘要：
链接: https://codeforces.com/contest/1230/problem/B 题意: Ania has a large integer S. Its decimal representation has length n and doesn't contain any lead 阅读全文