摘要：
Problem Description In middle school, teachers used to encourage us to pick up pretty sentences so that we could apply those sentences in our own arti 阅读全文
摘要：
Problem Description 035 now faced a tough problem,his english teacher gives him a string,which consists with n lower case letter,he must figure out ho 阅读全文
摘要：
Problem Description Given a string S. K-string is the sub-string of S and it appear in the S at least K times.It means there are at least K different 阅读全文