[goormlevel/Java] 숫자 배열

-Code

import java.io.*;
import java.util.*;

class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int n = Integer.parseInt(br.readLine());
		// 배열 셋팅
		int[][] arr = new int[n][n];
		int num = 1;
		for (int r = 0; r < n; r++) {
			for (int c = 0; c < n; c++) {
				arr[r][c] = num++;
			}
		}
		// 출력
		for (int r = 0; r < n; r++) {
			StringBuilder sb = new StringBuilder();
			for (int c = 0; c < n; c++) {
				sb.append(arr[r][c]);
				// 마지막을 제외하고 " " 넣어주기
				if (c < n - 1) sb.append(" ");
			}
			System.out.println(sb);
		}
	}
}