JS 알고리즘 8주차

8주차

1. 평행 ⭐️⭐️⭐️

https://school.programmers.co.kr/learn/courses/30/lessons/120875

❓

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2. OX퀴즈 ⭐️⭐️

https://school.programmers.co.kr/learn/courses/30/lessons/120907

function solution(quiz) {
    const correct = quiz.map(a => eval(a.split(" = ")[0]))
    const result = quiz.map(a => +a.split(" = ")[1])
    return result.map((a,i,arr) => a === correct[i] ? 'O' : 'X');
}

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3. 로그인 성공? ⭐️⭐️

https://school.programmers.co.kr/learn/courses/30/lessons/120883

function solution(id_pw, db) {
  const [id, pw] = id_pw;
  const map = new Map(db);
  return map.has(id) ? (map.get(id) === pw ? 'login' : 'wrong pw') : 'fail';
}

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4. 구슬을 나누는 경우의 수 ⭐️⭐️

https://school.programmers.co.kr/learn/courses/30/lessons/120840

function solution(balls, share) {
    let x = 1;
    let y = 1;
    let z = 1;

    for (let i = 1; i <= balls; i++) x *= i;
    for (let i = 1; i <= (balls - share); i++) y *= i;
    for (let i = 1; i <= share; i++) z *= i;
    
    return Math.round(x / (y * z));
}

✅ 소수점 오류 원인 해결하기 : https://joooing.tistory.com/entry/Javascript-%EC%86%8C%EC%88%98%EC%A0%90floating-point-%EA%B3%84%EC%82%B0-%EC%98%A4%EB%A5%98

🔈 사실 다 어렵 😫