Kangaroo.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Kangaroo {
	//https://www.hackerrank.com/challenges/kangaroo/problem
    // Complete the kangaroo function below.
    static String kangaroo(int x1, int v1, int x2, int v2) {
        int difSpeed = 0;
        if(x1 < x2 && v1 >v2){
            difSpeed = v1-v2;
            if(((x2-x1) % difSpeed) == 0)
                return "YES";
        }else if(x2 < x1 && v2>v1){
            difSpeed = v2-v1;
            if(((x1-x2) % difSpeed) == 0)
                return "YES";
        }else
            return "NO";


        return "NO";
    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] x1V1X2V2 = scanner.nextLine().split(" ");

        int x1 = Integer.parseInt(x1V1X2V2[0]);

        int v1 = Integer.parseInt(x1V1X2V2[1]);

        int x2 = Integer.parseInt(x1V1X2V2[2]);

        int v2 = Integer.parseInt(x1V1X2V2[3]);

        String result = kangaroo(x1, v1, x2, v2);

        bufferedWriter.write(result);
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}