摘要：
Description描述Let f(n) be a sum of digits for positive integer n. If f(n) is one-digit number then it is a digital root for n and otherwise digital roo... 阅读全文
摘要：
Description描述Find amount of numbers for given sequence of integer numbers such that after raising them to theM-th power they will be divided byK.求出给定一... 阅读全文
摘要：
Description描述You want to arrange the window of your flower shop in a most pleasant way. You haveFbunches of flowers, each being of a different kind, a... 阅读全文