Root :: AOAPC I: Beginning Algorithm Contests (Rujia Liu) :: Volume 0. Getting Started :: 10055 - Hashmat the Brave Warrior

Solution :

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.util.Scanner;

class Main {

    public static void main(String[] args) throws IOException {

        new Main().begin();

    }

    private void begin() {

        Scanner in = new Scanner(System.in);

        PrintStream ps = new PrintStream(System.out);

        while (in.hasNext()) {

            long x = in.nextLong();

            long y = in.nextLong();

            System.out.println(Math.abs(y - x));

        }

    }

}