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

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class Solution {
    public int maxProfit(int[] prices, int fee) {
        int n = prices.length;

        // 定义 dp[i][j] 为第 i 天休市时处于 j 状态时的最大利润，j = 0: 未持有股票，j = 1: 持有股票
        int[][] dp = new int[n][2];

        dp[0][0] = 0;
        dp[0][1] = -prices[0];

        for (int i = 1; i < n; i++) {
            dp[i][0] = Math.max(dp[i - 1][0], dp[i - 1][1] + prices[i] - fee);
            dp[i][1] = Math.max(dp[i - 1][1], dp[i - 1][0] - prices[i]);
        }

        return dp[n - 1][0];
    }
}

References

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