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)

public class Main{
  public void run(java.io.InputStream in, java.io.PrintStream out){
    java.util.Scanner sc = new java.util.Scanner(in);
/*answer*/
    double x1, y1, x2, y2;

    x1 = sc.nextDouble();
    y1 = sc.nextDouble();
    x2 = sc.nextDouble();
    y2 = sc.nextDouble();
    System.out.println(Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)));

    sc.close();
  }
  public static void main(String[] args){
    (new Main()).run(System.in, System.out);
  }
}