dev.sjk0105

<p>안녕하세요 ArrayList 를 이용한 3중 for문 코드입니다.</p>
<pre class="language-java"><code>import java.util.ArrayList;
import java.util.Scanner;

class Main {
    public int solution(int[][] arr, int student_size, int test_size) {
        int answer = 0;
        ArrayList<Integer> possible = new ArrayList<>();

        for (int i = 0; i < student_size; i++) {
            possible.clear();
            for(int init = 1; init < student_size+1; init++) possible.add(init);

            int my = i+1;
            for(int test = 0; test < test_size; test++) {
                boolean islow = false;
                for (int rank = 0; rank < student_size; rank++) {
                    if (!islow && possible.contains(arr[test][rank])) possible.remove(Integer.valueOf(arr[test][rank]));
                    if (arr[test][rank] == my) islow = true;
                }
            }
            answer += possible.size();
        }

        return answer;
    }

    public static void main(String[] args) {
        Main T = new Main();
        Scanner kb = new Scanner(System.in);
        int student = kb.nextInt();
        int test = kb.nextInt();
        int[][] arr = new int[test][student];
        for (int i = 0 ; i < test; i++)
            for (int j = 0; j < student; j++)
                arr[i][j] = kb.nextInt();
        System.out.println(T.solution(arr, student, test));
    }
}</code></pre>

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