摘要： It is always exciting to see people settling in a new continent. As the head of the population management office, you are supposed to know, at any tim 阅读全文

摘要： The ACM ICPC's rule of scoring is as the following: A problem is solved when it is accepted by the judges. Teams are ranked according to the most prob 阅读全文

摘要： A binary search tree is uniquely determined by a given ordered insertions of a sequence of positive integers. On the other hand, a given binary search 阅读全文