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 C# (judge verdict: Accepted)

using System;

public class ITP1_10_A{
    public static void Main(){
        var items = Console.ReadLine().Split(' ');
        
        var x1 = double.Parse(items[0]);
        var y1 = double.Parse(items[1]);
        var x2 = double.Parse(items[2]);
        var y2 = double.Parse(items[3]);
        
        var ans = Math.Sqrt(Math.Pow(x2 - x1, 2) + Math.Pow(y2 - y1, 2));
        Console.WriteLine(ans);
    }
}