ACM第三次比赛UVA11877 The Coco-Cola Store

Once upon a time, there is a special coco-cola store. If you return three empty bottles to the shop,

you’ll get a full bottle of coco-cola to drink. If you have n empty bottles right in your hand, how many

full bottles of coco-cola can you drink?

Input

There will be at most 10 test cases, each containing a single line with an integer

n

(1<=n<=100). Theinput terminates withn= 0, which should not be processed.

Output

For each test case, print the number of full bottles of coco-cola that you can drink.

Spoiler

Let me tell you how to drink 5 full bottles with 10 empty bottles: get 3 full bottles with 9 empty

bottles, drink them to get 3 empty bottles, and again get a full bottle from them. Now you have 2

empty bottles.

Borrow another empty bottle from the shop

, then get another full bottle. Drink it, and

finally return this empty bottle to the shop!

Sample Input

3

10

81

0

Sample Output

1

5

40

程序分析：此题的大概意思就是3空汽水瓶子可以换一瓶汽水，但是值得注意的就是每3个空瓶子得1瓶汽水，但同时也会多得到一个空瓶子。

程序代码：

#include<cstdio>
#include<iostream>
using namespace std;
int main()
{int T,n,i=0;
while(scanf("%d",&n)==1&&n)
{
    if(n<3)
{cout<<0<<endl;
continue;
}

while(n>0)
{n-=3;
i++;
n++;
}
i+=n;
cout<<i<<endl;
i=0;
}
return 0;
}