[프로그래머스] 프린터

import java.util.*;

class Solution {
    public int[] solution(int[] progresses, int[] speeds) {
        Stack<Integer> releaseStack = new Stack();
        int curMaxDay = 0;
        int releaseDay = 0;
        for (int i=0; i<progresses.length; i++) {
            releaseDay = (int)Math.ceil((100 - progresses[i]) / (double)speeds[i]);
            if (!releaseStack.isEmpty()) {
                if (curMaxDay >= releaseDay) {
                    releaseStack.push(releaseStack.pop() + 1);
                } else {
                    releaseStack.push(1);
                    curMaxDay = releaseDay;
                }
            } else {
                releaseStack.push(1);
                curMaxDay = releaseDay;
            }
        }

        int[] answer = new int[releaseStack.size()];
        for (int i=answer.length-1; i>=0; i--) {
            answer[i] = releaseStack.pop();
        }
        return answer;
    }
}