🔗 Matrix Addition

Matrix addition takes two matrices of equal number of rows and columns, and produces a result by adding the values at the same row and same column. Given two matrices arr1 and arr2, complete the function solution that returns the result of the matrix addition.

• The number of rows and columns of matrices arr1 and arr2 does not exceed 500.

We need to compute the sum of matrices, that is, of 2-dimensional arrays. Simply loop through with a nested loop, adding each element and returning the result.

JAVA
/**
 * Matrix Addition class
 *
 * @author RWB
 * @since 2021.12.13 Mon 22:12:23
 */
class Solution
{
	/**
	 * Method that returns the answer
	 *
	 * @param arr1: [int[][]] matrix 1
	 * @param arr2: [int[][]] matrix 2
	 *
	 * @return [int[][]] answer
	 */
	public int[][] solution(int[][] arr1, int[][] arr2)
	{
		int[][] answer = new int[arr1.length][arr1[0].length];
		
		for (int i = 0; i < arr1.length; i++)
		{
			for (int j = 0; j < arr1[i].length; j++)
			{
				answer[i][j] += arr1[i][j] + arr2[i][j];
			}
		}
		
		return answer;
	}
}