## Alt matrix sum in java

You are given a chessboard of size N x N, where the top left square is black. Each square contains a value. Find the sum of values of all black square and all white squares.

Remember that in a chessboard black and white squares alternate. Input User task: Input consists on N and the the numbers in the NxN matrix. You need to print out the sum of black squares and then white squares in the next line.

#### Constraints:-

``````1 <= N <= 1000
1 <= Matrix[i][j] <= 100000
``````

#### Output

Print two lines, first line containing the sum of black squares and second line containing the sum of white squares.

### Example

#### Input:

``````3
1 2 3
4 5 6
7 8 9
``````

#### Output:

``````25
20
``````
##### Explanation:-

black square contains 1, 3, 5, 7, 9; sum = 25

white square contains 2, 4, 6, 8; sum = 20

## Solution of Alt matrix sum :–

```import java.util.*;
import java.lang.*;
import java.io.*;

public class Main
{
public static void main (String[] args) throws java.lang.Exception
{
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

int arr[][] = new int[n][n];

for(int i=0;i<arr.length;i++)
{
for(int j=0;j<arr[i].length;j++)
{
arr[i][j]=sc.nextInt();
}
}

int sum=0,temp=0;
for(int i=0;i<arr.length;i++)
{
for(int j=0;j<arr[i].length;j++)
{
if((i+j)%2==0)
{
sum=sum+arr[i][j];
}
else{
temp=temp+arr[i][j];
}
}
}

System.out.println(sum);
System.out.println(temp);
}
}```