**Beer Bottles - Microsoft Top Interview Questions**

### Problem Statement :

You are given an integer n representing n full beer bottles. Given that you can exchange 3 empty beer bottles for 1 full beer bottle, return the number of beer bottles you can drink. Constraints 0 ≤ n < 2 ** 31 Example 1 Input n = 9 Output 13 Explanation In first round, we drink 9 beer bottles. We can exchange the 9 empty ones for 3 beer bottles. We can exchange the 3 empty ones for 1 beer bottle.

### Solution :

` ````
Solution in C++ :
int solve(int n) {
return !!n * (n + n / 2 - 1 + (n & 1));
}
```

` ````
Solution in Java :
import java.util.*;
class Solution {
public int solve(int n) {
int exchange = 0;
int initial = n;
while (n > 2) {
exchange += n / 3;
n = (n % 3 + n / 3);
}
return (initial + exchange);
}
}
```

` ````
Solution in Python :
class Solution:
def solve(self, full):
empty = 0
drunken = 0
while full:
drunken += full
empty += full
full = empty // 3
empty %= 3
return drunken
```

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