text: int maxProfit(int* prices, int pricesSize){
      int answer = 0;
      int buyingPrice = prices[0];
      
      for (int i = 1; i < pricesSize; i++){
          if (prices[i] < buyingPrice)
              buyingPrice = prices[i];
          else if (prices[i] - buyingPrice > answer)
              answer = prices[i] - buyingPrice;
      }
      
      return answer;
  }
  