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;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var line = Console.ReadLine().Split().Select(z => double.Parse(z)).ToArray();
            double x1 = line[0], y1 = line[1], x2 = line[2], y2 = line[3];

            var ans = Math.Sqrt(Math.Pow(Math.Abs(x2 - x1), 2) + Math.Pow(Math.Abs(y2 - y1), 2));
            Console.WriteLine(ans);
        }
    }
}