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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

const main = (N,D,X) => {
    var count = 0

    for(var i =0;i<N;i++) {
        for(var k=i;k<N;k++) {
            var tmp = 0

            if(i === k) {
                continue
            }

            for(var j = 0;j<D;j++) {
                const xd = Math.abs(X[i][j]-X[k][j])
                tmp+=xd*xd
            }

            for(var t = 0;t<=tmp;t++) {
                if(t*t === tmp) {
                    count++
                    break
                }
            }
        }
    }
    return count
}




const input = require('fs').readFileSync('/dev/stdin','utf8')
                           .split("\n")
                           .filter(i => i !== '')
const lst = input.map(i => i.split(" ").map(x => Number(x)))
const N = lst[0][0]
const D = lst[0][1]
const X = lst.slice(1,lst.length)
console.log(main(N,D,X))