摘要：Write a method that calculates the factorial of a given number. The factorial of n is calculated by the product of integer number from 1 to n (inclusi 阅读全文

摘要：Read an integer number N from the input and print all the squares of natural numbers: less than or equal to N, in ascending order. Sample Input 1: 50 阅读全文

摘要：We need your help to improve an adaptive system. There's a program that asks learners what programming language they are learning. There are four opti 阅读全文

摘要：The password is hard to crack if it contains at least A uppercase letters, at least B lowercase letters, at least C digits and includes exactly N symb 阅读全文