The operation of drinking a full water bottle turns it into an empty bottle.
Return the maximum number of water bottles you can drink.
Example 1:
Input: numBottles = 9, numExchange = 3 Output: 13 Explanation: You can exchange 3 empty bottles to get 1 full water bottle. Number of water bottles you can drink: 9 + 3 + 1 = 13. Example 2:
Input: numBottles = 15, numExchange = 4 Output: 19 Explanation: You can exchange 4 empty bottles to get 1 full water bottle. Number of water bottles you can drink: 15 + 3 + 1 = 19. Example 3:
Input: numBottles = 5, numExchange = 5 Output: 6 Example 4:
Input: numBottles = 2, numExchange = 3 Output: 2
class Solution { public: int numWaterBottles(int numBottles, int numExchange) { int res=numBottles, empty=numBottles; while(empty>=numExchange) { res+=empty/numExchange; empty=empty/numExchange+empty%numExchange; } return res; } };