1518. 换酒问题

1518. 换酒问题

class Solution {
public:
    int numWaterBottles(int numBottles, int numExchange) {
        int res=numBottles;
        while(numBottles>=numExchange){
            res+=numBottles/numExchange;
            numBottles=numBottles/numExchange+numBottles%numExchange;
        }
        return res;
    }
};