汽水瓶 （Java代码）

解题思路:





注意事项:





参考代码:

import java.util.Scanner;

public class A1072 {

    public static void main(String args[]) {

     Scanner sc = new Scanner(System.in);

     do {

      int a = sc.nextInt();

      if (a == 0)

       break;

      int b = 0;

      int sum = 0;

     do {

      b = a % 3;

       sum = sum + (a - b) / 3;

       a = b + (a - b) / 3;

     } while (a >= 3);

    if (a == 1)

      System.out.println(sum);

    if (a == 2)

      System.out.println(sum + 1);

    } while (sc.hasNext());

   }

}