[프로그래머스 | Lv. 1 | JavaScript] 체육복

 

Link

코딩테스트 연습 - 체육복

 

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문제

풀이

(1)

function solution(n, lost, reserve) {
    let answer = 0;
    
    const realLost = lost.filter(student => !reserve.includes(student));
    const realReserve = reserve.filter(student => !lost.includes(student));
    
    realLost.sort((a, b) => a - b);
    let set = new Set(realReserve);
    
    realLost.forEach(item => {
       if (item - 1 >= 1 && set.has(item - 1)) {
           answer += 1;
           set.delete(item - 1);
       } else if (item + 1 <= n && set.has(item + 1)) {
           answer += 1;
           set.delete(item + 1);
       }
    });
    
    return n - realLost.length + answer;
}