Problem:
Score : 200 points

Problem Statement

There are N points in a D-dimensional space.

The coordinates of the i-th point are (X_{i1}, X_{i2}, ..., X_{iD}).

The distance between two points with coordinates (y_1, y_2, ..., y_D) and (z_1, z_2, ..., z_D) is \sqrt{(y_1 - z_1)^2 + (y_2 - z_2)^2 + ... + (y_D - z_D)^2}.

How many pairs (i, j) (i < j) are there such that the distance between the i-th point and the j-th point is an integer?

Constraints

All values in input are integers.

2 \leq N \leq 10

1 \leq D \leq 10

-20 \leq X_{ij} \leq 20

No two given points have the same coordinates. That is, if i \neq j, there exists k such that X_{ik} \neq X_{jk}.

Input

Input is given from Standard Input in the following format:

N D
X_{11} X_{12} ... X_{1D}
X_{21} X_{22} ... X_{2D}
\vdots
X_{N1} X_{N2} ... X_{ND}

Output

Print the number of pairs (i, j) (i < j) such that the distance between the i-th point and the j-th point is an integer.

Sample Input 1

3 2
1 2
5 5
-2 8

Sample Output 1

1

The number of pairs with an integer distance is one, as follows:

The distance between the first point and the second point is \sqrt{|1-5|^2 + |2-5|^2} = 5, which is an integer.

The distance between the second point and the third point is \sqrt{|5-(-2)|^2 + |5-8|^2} = \sqrt{58}, which is not an integer.

The distance between the third point and the first point is \sqrt{|-2-1|^2+|8-2|^2} = 3\sqrt{5}, which is not an integer.

Sample Input 2

3 4
-3 7 8 2
-12 1 10 2
-2 8 9 3

Sample Output 2

2

Sample Input 3

5 1
1
2
3
4
5

Sample Output 3

10

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;

namespace abc133_b
{
    class Program
    {
        static void Main(string[] args)
        {
            var items = Console.ReadLine().Split(' ');
            var n = int.Parse(items[0]);
            var d = int.Parse(items[1]);
            var x = new int[n][];
            for (int ni = 0; ni < n; ni++)
            {
                x[ni] = Console.ReadLine().Split(' ').Select(m => int.Parse(m)).ToArray();
            }

            var count = 0;
            for (int ni = 0; ni < n; ni++)
            {
                for (int i = ni + 1; i < n; i++)
                {
                    var distance = Distance(d, x[ni], x[i]);
                    if (distance - Math.Floor(distance) == 0.0)
                    {
                        count++;
                    }
                }
            }
            Console.WriteLine($"{count}");
        }
        static double Distance(int d, int[] y, int[] z)
        {
            var ans = 0.0;
            for (int i = 0; i < d; i++)
            {
                ans += Math.Pow(y[i] - z[i], 2);
            }
            return Math.Sqrt(ans);
        }
    }
}