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 Kotlin (judge verdict: Accepted)

import java.util.*

fun main(args: Array<String>) {
    val scanner = Scanner(System.`in`)
    val x1 = scanner.nextDouble()
    val y1 = scanner.nextDouble()
    val x2 = scanner.nextDouble()
    val y2 = scanner.nextDouble()
    println(Math.sqrt(Math.pow(x1 - x2, 2.toDouble()) + Math.pow(y1 - y2, 2.toDouble())))
}