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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<math.h>
int main(void) {
	int  n, d;
	scanf("%d %d", &n, &d);
	double  x[100][100];

	int i, j;

	for (i = 0; i < n; i++) {
		for (j = 0; j < d; j++) {
			scanf("%lf", &x[i][j]);
		}
	}

	int hako = 0;
	double ans = 0;

	int count = 0;

	
	for (i = 0; i < n; i++) {
		for (j = 0; j < d; j++) {
			if (i != n - 1) {
				hako=  hako+(x[i][j] - x[i + 1][j]) * (x[i][j] - x[i + 1][j]);
			}
			else {
				hako =hako+(x[i][j] - x[0][j])* (x[i][j] - x[0][j]);
				
			}
		}
		ans = sqrt(hako);
		
		if (ceil(ans) != floor(ans)) {
			ans = 0;
			hako = 0;
	
		}
		else {
			count++;
			ans = 0;
			hako = 0;
		}
	
	}
	if (d == 1) {
		count = count * 2;
	}
	printf("%d\n", count);
	
	

	return 0;
}