摘要： An integer is divisible by 3 if the sum of its digits is also divisible by 3. For example, 3702 is divisibleby 3 and 12(3+7+0+2) is also divisible by 阅读全文

摘要： For each prefix of a given string S with N characters (each character has an ASCII code between 97 and126, inclusive), we want to know whether the pre 阅读全文

摘要： "Kronecker's Knumbers" is a little company that manufactures plastic digits for use in signs (theater marquees, gas station price displays, and so on) 阅读全文

摘要： The stores manager has sorted all kinds of goods in an alphabetical order of their labels. All the kinds having labels starting with the same letter a 阅读全文