摘要：
链接：https://codeforces.com/contest/1167/problem/D 题意： A string is called bracket sequence if it does not contain any characters other than "(" and ")". 阅读全文
摘要：
链接：https://codeforces.com/contest/1167/problem/C 题意： In some social network, there are nn users communicating with each other in mm groups of friends. 阅读全文
摘要：
链接：https://codeforces.com/contest/1167/problem/B 题意： This is an interactive problem. Remember to flush your output while communicating with the testin 阅读全文
摘要：
链接：https://codeforces.com/contest/1167/problem/A 题意： A telephone number is a sequence of exactly 11 digits, where the first digit is 8. For example, t 阅读全文
摘要：
链接：https://codeforces.com/contest/1166/problem/C 题意： The legend of the foundation of Vectorland talks of two integers xx and yy. Centuries ago, the ar 阅读全文
摘要：
链接：https://codeforces.com/contest/1166/problem/B 题意： Tom loves vowels, and he likes long words with many vowels. His favorite words are vowelly words. 阅读全文
摘要：
链接：https://codeforces.com/contest/1166/problem/A 题意： There are nn students in the first grade of Nlogonia high school. The principal wishes to split t 阅读全文