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

Link

Solution

    public int maxProfit(int[] prices, int fee) {
        int end_buy = Integer.MIN_VALUE, end_sell = 0;
        
        for(int price : prices){
            int old_end_buy = end_buy; //just to avoid affecting second equation
            end_buy = Math.max(end_buy, end_sell-price-fee);
            end_sell = Math.max(end_sell, old_end_buy + price);
            
        }
        return end_sell;
            
    }