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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN,"%d %d",$N,$D);
for($i=0;$i<$N;$i++){
  $X = fgets(STDIN);
  ${"array".$i} = explode(" ",$X);
}
$counter = 0;
for($i=0;$i<($N-1)-1;$i++){
  for($j=$i+1;$j<$N;$j++){
    $result = calcDistance(${"array".$i},${"array".$j});
    if(is_decimal($result)){
      $counter++;
    }
  }
}
echo $counter;

//2点の距離を求める関数
function calcDistance($arrayA,$arrayB){
  $result = 0;
  for($i=0;$i<count($arrayA);$i++){
    $result += ($arrayA[$i]-$arrayB[$i])**2;
  }
  return sqrt($result);
}

//整数かチェックする関数（数値型文字列含む）
//https://qiita.com/imamura0825/items/60cc09bab1f3726fc669
function is_decimal($value) {
    return filter_var($value, FILTER_VALIDATE_INT) !== false;
}