Problem:
Distance

Write a program which calculates the distance between two points P1(x1, y1) and P2(x2, y2).

Input

Four real numbers x1, y1, x2 and y2 are given in a line.

Output

Print the distance in real number. The output should not contain an absolute error greater than 10-4.

Sample Input

0 0 1 1

Sample Output

1.41421356

Solution in JAVA (judge verdict: Accepted)

import java.util.Scanner;


public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double x1=scanner.nextDouble();
        double y1=scanner.nextDouble();
        double x2=scanner.nextDouble();
        double y2=scanner.nextDouble();
        
        double deltax=(x2-x1)*(x2-x1);
        double deltay=(y2-y1)*(y2-y1);
        
        double kyori=Math.sqrt(deltax+deltay);
        System.out.println(kyori);
    }
}