[프로그래머스 | Lv. 1 | JavaScript] 모의고사

 

Link

코딩테스트 연습 - 모의고사

 

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문제

풀이

(1)

function solution(answers) {
    let answer = [0, 0, 0];
    
    let len = answers.length;
    let one = '12345'.repeat(Math.ceil(len / 5)).split('').map(Number);
    let two = '21232425'.repeat(Math.ceil(len / 8)).split('').map(Number);
    let three = '3311224455'.repeat(Math.ceil(len / 10)).split('').map(Number);
    
    for (let i = 0; i < len; i++) {
        let a = answers[i];
        if (one[i] === a) answer[0] += 1;
        if (two[i] === a) answer[1] += 1;
        if (three[i] === a) answer[2] += 1;
    }
    
    let max = Math.max(...answer);
    return answer.map((m, i) => (m === max ? i + 1 : null)).filter(v => v !== null);
}

(2)

function solution(answers) {
    const patterns = [
        [1, 2, 3, 4, 5],
        [2, 1, 2, 3, 2, 4, 2, 5],
        [3, 3, 1, 1, 2, 2, 4, 4, 5, 5]
    ];
    
    const scores = [0, 0, 0];
    
    answers.forEach((answer, index) => {
        patterns.forEach((pattern, person) => {
            if (answer === pattern[index % pattern.length]) {
                scores[person]++;
            }
        });
    });
    
    const maxScore = Math.max(...scores);
    
    return scores.reduce((result, score, index) => {
        if (score === maxScore) result.push(index + 1);
        return result;
    }, []);
}

(3)

function solution(answers) {
    const patterns = [
        [1, 2, 3, 4, 5],
        [2, 1, 2, 3, 2, 4, 2, 5],
        [3, 3, 1, 1, 2, 2, 4, 4, 5, 5]
    ];
    
    const scores = [0, 0, 0];
    
    answers.forEach((answer, index) => {
        if (patterns[0][index % patterns[0].length] === answer) scores[0] += 1;
        if (patterns[1][index % patterns[1].length] === answer) scores[1] += 1;
        if (patterns[2][index % patterns[2].length] === answer) scores[2] += 1;
    });
    
    const maxScore = Math.max(...scores);
    
    return scores.reduce((result, score, index) => {
        if (score === maxScore) result.push(index + 1);
        return result;
    }, []);
}