[Java] 프로그래머스 - 모의고사

1월 24일(수) - 6장 완전 탐색

프로그래머스

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import java.util.stream.IntStream;


public class Solution {

    private static int[][] RULES={
            {1,2,3,4,5},
            {2,1,2,3,2,4,2,5},
            {3,3,1,1,2,2,4,4,5,5},
    };

    private int get_picked(int person, int problem){
        int[] rule = RULES[person];
        int idx = problem % rule.length;
        return rule[idx];
    }

    public int[] solution(int[] answers){
        int[] corrects = new int[3];
        int max = 0;

        for(int problem=0; problem< answers.length; problem++)
        {
            int answer = answers[problem];

            for(int person=0; person<3; person++)
            {
                int picked = get_picked(person, problem);
                if(answer == picked)
                {
                    if(++corrects[person] > max)
                    {
                        max = corrects[person];
                    }
                }
            }
        }

        final int max_corrects = max;
        return IntStream.range(0,3)
                .filter(i -> corrects[i] == max_corrects)
                .map(i -> i+1)
                .toArray();
    }
}

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