https://www.acmicpc.net/problem/2738
다차원 배열은 이중for문을 사용한다.
package com.example.baekjoon;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
int arrA[][] = new int[n][m];
int arrB[][] = new int[n][m];
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
arrA[i][j] = sc.nextInt();
}
}
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
arrB[i][j] = sc.nextInt();
}
}
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
System.out.print((arrA[i][j] + arrB[i][j]) + " ");;
}
System.out.println();
}
}
}