摘要： Very often, especially in programming contests, we treat a sequence of non-whitespace characters as a string. But sometimes, a string may contain whit... 阅读全文

摘要： Alice lives in the country where people like to make friends. The friendship is bidirectional and if any two person have no less than k friends in com... 阅读全文

摘要： Recently, the ACM/ICPC team of Marjar University decided to choose some new members from freshmen to take part in the ACM/ICPC competitions of the nex... 阅读全文