摘要：
Black BoxTime Limit:1000MSMemory Limit:10000KTotal Submissions:8637Accepted:3542DescriptionOur Black Box represents a primitive database. It can save ... 阅读全文
摘要：
Virtual FriendsProblem Description These days, you can do all sorts of things online. For example, you can use various websites to make virtual frien... 阅读全文