프로그래머스 - 모의고사

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;

class Solution {
    public int[] solution(int[] answers) {
        int[][] stdAnswer = {{1, 2, 3, 4, 5}, {2, 1, 2, 3, 2, 4, 2, 5}, {3, 3, 1, 1, 2, 2, 4, 4, 5, 5}};

        int[] answerCount = new int[3];

        ArrayList<Integer> studentList = new ArrayList<>();

        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < answers.length; j++) {
                if (answers[j] == stdAnswer[i][j  % stdAnswer[i].length ]) {
                    answerCount[i] += 1;
                }
            }
        }

        int num = Math.max(answerCount[0], Math.max(answerCount[1], answerCount[2]));

        for (int i = 1; i <= 3; i++) {
            if(answerCount[i-1] == num){
                studentList.add(i);
            }
        }

        int[] arr = studentList.stream().mapToInt(Integer::intValue).toArray();
        
        Arrays.sort(arr);


        return arr;
    }
}