题解 | #汽水瓶#

import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        List<Integer> list = new ArrayList<>();
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) {
            int inputVal = Integer.parseInt(in.nextLine());
            if (inputVal == 0) {
                for (Integer e : list) {
                    System.out.println(e);
                }
            } else {
                list.add(calculate(inputVal));
            }
        }
    }
    private static int calculate(int bottleCount) {
        if (bottleCount <= 1) {
            return 0;
        } else if (bottleCount <= 3) {
            return 1;
        }
        int drinkCount = bottleCount / 3;
        int mod = bottleCount % 3;
        int total = drinkCount + mod;
        return calcaulate(total) + drinkCount;
    }
}