714. Best Time to Buy and Sell Stock with Transaction Fee

int maxProfit(vector<int>& prices, int fee) {
int buy = INT_MIN, sell = 0,prebuy;
for(int i=0;i<prices.size();i++){
prebuy = buy;
buy = max(buy,sell-prices[i]-fee);
sell = max(sell,prebuy + prices[i]);
}
return sell;
}