笔试题3. 喝汽水...

问题描述：一块钱可以买一瓶汽水，两个空瓶能换一瓶汽水，现在有20块钱，问能喝多少瓶汽水。

#include<stdio.h>int Maxdrink(int n){int total = n;int empty = n;//int tmp = 0;while (empty > 1){if (empty % 2 != 0)  //奇数{//tmp = 1; //多余了一个空瓶total += (empty - 1) / 2;empty = (empty - 1) / 2;empty = empty + 1;}else     //偶数{total += empty / 2;empty = empty / 2;}}return total;}int main(){printf("%d\n",Maxdrink(20));//printf("%d\n",Maxdrink(21));return 0;}