zadacha 5*

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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            double r,max;
            int i, j,p,p1;
            int[,] array = new int[10, 2];
            for (i = 0; i < 10; i++)
            {
                array[i, 0] = int.Parse(Console.ReadLine());
                array[i, 1] = int.Parse(Console.ReadLine());
            }
            //a
            for ( i=0;i<10; i++)
            {
                Console.WriteLine(array[i, 0] + " " + array[i, 1]);
            }
            Console.WriteLine();
            //b
            for (i = 0; i < 10; i++)
            {
                Console.Write(array[i, 0] + " " + array[i, 1] + " " );
                if (array[i, 0] > 0 && array[i, 1] > 0) Console.WriteLine("kwadrant 1");
                if (array[i, 0] > 0 && array[i, 1] < 0) Console.WriteLine("kwadrant 4");
                if (array[i, 0] < 0 && array[i, 1] > 0) Console.WriteLine("kwadrant 2");
                if (array[i, 0] < 0 && array[i, 1] < 0) Console.WriteLine("kwadrant 3");

            }
            //c
            for (i = 0; i < 10; i++)
            {
                Console.Write(array[i, 0] + " " + array[i, 1] + " ");
                r = Math.Sqrt(Math.Pow(array[i, 0], 2) + Math.Pow(array[i, 1], 2));
                Console.WriteLine("razstoqnieto = " + r);
            }
            //d
            max = 0;p = 0;
            for (i = 0; i < 10; i++)
            {
                r = Math.Sqrt(Math.Pow(array[i, 0], 2) + Math.Pow(array[i, 1], 2));
                if (max < r)
                {
                    max = r;
                    p = i;
                }

            }
            Console.WriteLine("max razst. = " + max + " na tochka " + p);
            //e
            max = 0; p = 0;p1 = 0;
            for (i = 0; i < 9; i++)
            {
                for (j = i + 1; j < 10; j++)
                {
                    r = Math.Sqrt(Math.Pow(array[i, 0] - array[j, 0], 2) - Math.Pow(array[i, 1] - array[j, 1], 2));
                    if (max < r)
                    {
                        p1 = j;
                        p = i;
                    }
                }
            }
            Console.WriteLine("nai otdalecheni tochki: " + p + " " + p1);
        }
    }
}
/*
3
4
-1
4
-5
-4
7
-1
10
10
-5
-2
-10
-10
7
-4
9
9
2
3
*/