[프로그래머스] 실패율 자바스크립트(Javascript)

 

 

문제

https://programmers.co.kr/learn/courses/30/lessons/42889?language=javascript

코딩테스트 연습 - 실패율

 

 

 

풀이

 

function solution(N, stages) {
  const array = [];
  const people = stages.length;
  let restPeople = people;

  const res = stages.reduce((acc, curr) => {
    acc[curr] = (acc[curr] || 0) + 1;
    return acc;
  }, {});

  for (let i = 0; i < N; i++) {
    let nowPeople = res[i + 1] || 0;
    array.push([i + 1, nowPeople / restPeople]);
    restPeople -= nowPeople;
  }

  array.sort((a, b) => b[1] - a[1]);
  return array.map((item) => item[0]);
}