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.ArrayList;
import java.util.List;
import java.util.Scanner;

class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int d = sc.nextInt();
		
		int[][] list = new int[n][d];
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < d; j++) {
				list[i][j] = sc.nextInt();
			}
		}
		
//		int cnt = 0;
//		for (int i = 0; i < n - 1; i++) {
//			int sum = 0;
//			for (int j = 0; j < d; j++) {
//				int temp = (int) Math.pow(list[i][j] - list[i + 1][j], 2);
//				sum += temp;
//			}
//			int temp2 = (int) Math.sqrt(sum);
//			if (Math.pow(temp2, 2) == sum) {
//				cnt++;
//			}
//			
//		}
		
		// n3 d4
		int cnt = 0;
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				int sum = 0;
				for (int k = 0; k < d; k++) {
					int temp = (int) Math.pow(list[i][k] - list[j][k], 2);
					sum += temp;
				}
				int temp2 = (int) Math.sqrt(sum);
				if (Math.pow(temp2, 2) == sum) cnt++;
			}
		}
		
		System.out.println(cnt);
				
	}
}