摘要： You are given an equation: Ax2 + Bx + C = 0. Your task is to find the number of distinct roots of the equation and print all of them in ascending orde 阅读全文

摘要： Phone number in Berland is a sequence of n digits. Often, to make it easier to memorize the number, it is divided into groups of two or three digits. 阅读全文

摘要： The new operating system BerOS has a nice feature. It is possible to use any number of characters '/' as a delimiter in path instead of one traditiona 阅读全文