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;
namespace ITP1_10_A
{
    class Problem
    {

        public static List<string[]> getinputdata (){

            List<string[]> list_temp = new List<string[]>();
            string strdata = Console.ReadLine ();

            while (strdata!=null) {

                string[] s_temp = strdata.Split (' ');

                list_temp.Add (s_temp);

                strdata = Console.ReadLine ();

            }

            return list_temp;
        }


        public static void Main (string[] args)
        {

            List<string[]> list_result = new List<string[]>();
            list_result = getinputdata();

            double x1 =double.Parse(list_result[0][0]);
            double y1 =double.Parse(list_result[0][1]);
            double x2 =double.Parse(list_result[0][2]);
            double y2 =double.Parse(list_result[0][3]);

            double distance = Math.Sqrt(Math.Pow(x2 - x1, 2) + Math.Pow(y2 - y1, 2));

            Console.WriteLine(distance);




        }

    }
}