题解 | #汽水瓶#

import java.util.Scanner;

public class Main{

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);

    int time = 0;

    while (time < 10) {
        // 瓶子的数量
        int pNum = scanner.nextInt();
        if (pNum == 0) {
            return;
        }
        // 喝过的汽水计数
        int count = 0;
        while (pNum >= 3) {

            count += pNum / 3;
            // 换完汽水后剩余瓶子的数量
            int result = pNum % 3;

            // 瓶子的数量等于剩余瓶子的数量+此次换完汽水的瓶数
            pNum = result + pNum / 3;

            if (pNum == 2) {
                count++;
                pNum = 1;
            }
        }
        System.out.println(count);
        time++;
    }
}

}