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.Collections.Generic;
using System.Linq;
using System.Text;

namespace Distance
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine().Split(' ');
            double[] ngo = new double[4];
            for(int i = 0; i < input.Length; ++i){
                ngo[i] = double.Parse(input[i]);
            }
            Console.WriteLine(Math.Sqrt(Math.Pow(ngo[2] - ngo[0], 2) + Math.Pow(ngo[3] - ngo[1], 2))); 
        }
    }
}