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 Go (1.6) (judge verdict: Wrong Answer)

package main

import ( 
		"fmt"
		"math"
)

var N, D int

func calcDis(arr1[10]int, arr2[10]int)float64 {
		dis := 0.0
		for j:=0; j<D; j++ {
				dis += (float64)((arr1[j] - arr2[j])*(arr1[j] - arr2[j]))
		}
		return math.Sqrt(dis)
}

func main() {
		fmt.Scan(&N, &D)
		var arr [10][10]int
		for i:=0; i<N; i++ {
				for j:=0; j<D; j++ {
						fmt.Scan(&arr[i][j])
				}
		}
		count := 0
		for i:=0; i<N-1; i++ {
				dis := calcDis(arr[i], arr[i+1])
				if math.Floor(dis) == dis {
						count++
				}
				//fmt.Println(dis)
		}
		dis := calcDis(arr[0], arr[N-1])
		//fmt.Println(dis)
		if math.Floor(dis) == dis {
				count++
		}
		fmt.Println(count)
}