1518.cpp (269B)
1 class Solution { 2 public: 3 int numWaterBottles(int numBottles, int numExchange) const { 4 int res = numBottles; 5 6 while (numBottles >= numExchange) { 7 numBottles -= numExchange - 1; 8 res++; 9 } 10 11 return res; 12 } 13 };