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;
using System.Linq;

class Pg
{
    static void Main()
    {
        var num = Console.ReadLine().Split().Select(double.Parse).ToArray();
        double x = num[2] - num[0];
        double y = num[3] - num[1];
        double ANSxANS = Math.Pow(x, 2) + Math.Pow(y, 2);
        Console.WriteLine(Math.Sqrt(ANSxANS));
    }
}