题解 | #汽水瓶#
汽水瓶
https://www.nowcoder.com/practice/fe298c55694f4ed39e256170ff2c205f
#include <iostream>
using namespace std;
int qishui(int n){
if (n==1){
return 0;
} else if(n==2){
return 1;
} else{
return n/3 + qishui(n/3+n%3);
}
}
int main() {
int n;
while (cin>>n){
if (n==0) break;
cout<<qishui(n)<<endl;
}
}
