摘要：问题 E: Pesky Publicans 时间限制: 1 Sec 内存限制: 128 MB 题目描述 Tax collectors in the Roman empire, called publicans, are not well perceived, and for good reason. 阅读全文

摘要：题目描述 You are teaching kindergarten! You wrote down the numbers from 1 to n, in order, on a whiteboard. When you weren’t paying attention, one of your 阅读全文

摘要：题目描述 There is a group of people in an internet email message group. Messages are sent to all members of the group, and no two messages are sent at the 阅读全文

摘要：题目描述 A group of students is taking a True/False exam. Each question is worth one point. You, as their teacher, want to make your students look as good 阅读全文