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: Wrong Answer)

import scala.io.StdIn
import Math.sqrt
/**
  * AOJ
  */
object Main {

  def main(args: Array[String]): Unit = {

    val i = StdIn.readLine().split(" ").map(_.toFloat)
    val x = i(0) - i(2)
    val y = i(1) - i(3)
    println(sqrt(x * x + y * y))
  }
}