[코딩테스트 Lv.1] 행렬의 덧셈

문제 설명

행렬의 덧셈은 행과 열의 크기가 같은 두 행렬의 같은 행, 같은 열의 값을 서로 더한 결과가 됩니다. 2개의 행렬 arr1과 arr2를 입력받아, 행렬 덧셈의 결과를 반환하는 함수, solution을 완성해주세요.

제한조건

▪️행렬 arr1, arr2의 행과 열의 길이는 500을 넘지 않습니다.

입출력 예

arr1		arr2		return
[[1,2],[2,3]]	[[3,4],[5,6]]	[[4,6],[7,9]]
[[1],[2]]	[[3],[4]]	[[4],[6]]

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내 풀이

Java

class Solution {
    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;
    }
}

Python

def solution(arr1, arr2):
    answer = []
    
    for i in range(len(arr1)):
        answer.append([])
        for j in range(len(arr1[i])):
            answer[i].append(arr1[i][j] + arr2[i][j])
    
    return answer

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https://school.programmers.co.kr/learn/courses/30/lessons/12950

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