For given integer N (1<=N<=10^4) find amount of positive numbers not greater than N that coprime with N. Let us call two positive integers (say, A and B, for ex...

X city built a new stadium, each day many people visit it and the stats are saved as these columns: id, visit_date, people

X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descriptions.Ple...

Mary is a teacher in a middle school and she has a table seat storing students’ names and their corresponding seat ids.

Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist ...

Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist ...

Suppose you are given the following code:

Write a program that outputs the string representation of numbers from 1 to n, however:

There is an equation ax + by + c = 0. Given a,b,c,x1,x2,y1,y2 you must determine, how many integer roots of this equation are satisfy to the following condition...

For given number N you must output amount of N-digit numbers, such, that last digits of their square is equal to 987654321.