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 hello
{

    public static void Main()
    {
        string[] s = Console.ReadLine().Trim().Split(' ');
        var x1 = double.Parse(s[0]);
        var y1 = double.Parse(s[1]);
        var x2 = double.Parse(s[2]);
        var y2 = double.Parse(s[3]);

        var buf = Math.Pow((y2 - y1), 2) + Math.Pow((x2 - x1), 2);
        var result = Math.Sqrt(buf);

        Console.WriteLine(result);
    }
}