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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int d = sc.nextInt();
        Integer[][] x = new Integer[n][d];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < d; j++) {
                x[i][j] = sc.nextInt();
            }
        }

        int result = 0;

        // リストのサイズ-1分繰り返す（最後のインデックスで比較対象がないため）
        for (int i = 0; i < n - 1; i++) {

            // 以降のインデックス全てを比較
            for (int k = 0; k < n - 1 - i; k++) {

                // ルートの中身の項を計算
                int sumInRoot = 0;
                for (int j = 0; j < d; j++) {
                    int y = x[i][j];
                    int z = x[i + 1 + k][j];
                    sumInRoot += (y - z) * (y - z);
                }

                // 座標xを求める
                String coordinate = String.valueOf(Math.sqrt(sumInRoot));

                // 整数判定
                int pointIndex = coordinate.indexOf(".");
                if (coordinate.length() - 2 == coordinate.substring(0, pointIndex).length()) {
                    result++;
                }
            }
        }

        System.out.println(result);
    }
}