[프로그래머스]체육복(javascript/자바스크립트)

문제

풀이 1

function solution(n, lost, reserve) {
    //re
    lost.sort((a,b) => b-a)
    reserve.sort((a,b) => b-a)
    
    lost = lost.filter(v => {
        let check = reserve.indexOf(v)
        if (check === -1) return check
        else reserve.splice(check,1)
    })

    return n - lost.filter(a => {
        const b = reserve.find(r => Math.abs(r-a) === 1)
        console.log(b)
        if(!b) return true
        reserve = reserve.filter(r => r !== b)
        }).length
}

풀이 2

function solution(n, lost, reserve) {
    const students = {};
    let answer = 0;
    for(let i = 1; i <= n; i++){
        students[i] = 1;
    }
    lost.forEach(number => students[number] -= 1);
    reserve.forEach(number => students[number] += 1);

    for(let i = 1; i <= n; i++){
        if(students[i] === 2 && students[i-1] === 0){
                students[i-1]++;
                students[i]--;
        } else if(students[i] === 2 && students[i+1] === 0){
                students[i+1]++;
                students[i]--;
        }
    }
    for(let key in students){
        if(students[key] >= 1){
            answer++;
        }
    }
    return answer;
}