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 Scala (judge verdict: Accepted)

import scala.math._

object Main extends App {
  val scanner = new java.util.Scanner(System.in)

  val x1 = scanner.nextDouble
  val y1 = scanner.nextDouble
  val x2 = scanner.nextDouble
  val y2 = scanner.nextDouble

  val output = sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2))

  println(output)
}