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 Program
{
    static void Main()
    {
        string str = Console.ReadLine();
        double a = double.Parse(str.Split(' ')[0]);
        double b = double.Parse(str.Split(' ')[1]);
        double c = double.Parse(str.Split(' ')[2]);
        double d = double.Parse(str.Split(' ')[3]);
        double ans = Math.Sqrt((c - a) * (c - a) + (d - b) * (d - b));
        Console.WriteLine(ans);
    }    
}