摘要：
Given a permutation pp of length nn, you are asked to answer mm queries, each query can be represented as a pair (l ,r )(l,r), you need to find the nu 阅读全文
摘要：
Recently Kumiko learns to use containers in C++ standard template library. She likes to use the std::vector very much. It is very convenient for her t 阅读全文
摘要：
String is a very useful thing and a subsequence of the same string is equally important. Now you have a string ss with length nn and a string tt with 阅读全文