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.*;
import java.io.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        Double x1 = Double.parseDouble(sc.next());
        Double y1 = Double.parseDouble(sc.next());
        Double x2 = Double.parseDouble(sc.next());
        Double y2 = Double.parseDouble(sc.next());

        Double H = y2 - y1;
        Double W = x2 - x1;
        Double dist2 = H * H + W * W;
        out.printf("%.10f\n", Math.sqrt(dist2));
        out.flush();
    }
}