Leetcode•Jun 27, 2025
Best Time to Buy and Sell Stock with Transaction Fee
Hazrat Ali
Leetcode
Find the maximum profit you can achieve. You may complete as many transactions as you like, but you need to pay the transaction fee for each transaction.
Note:
- You may not engage in multiple transactions simultaneously (i.e., you must sell the stock before you buy again).
- The transaction fee is only charged once for each stock purchase and sale.
Example 1:
Input: prices = [1,3,2,8,4,9], fee = 2 Output: 8 Explanation: The maximum profit can be achieved by: - Buying at prices[0] = 1 - Selling at prices[3] = 8 - Buying at prices[4] = 4 - Selling at prices[5] = 9 The total profit is ((8 - 1) - 2) + ((9 - 4) - 2) = 8.
Example 2:
Input: prices =
[1,3,7,5,10,3], fee = 3 Output: 6
Solution
/**
* @param {number[]} prices
* @param {number} fee
* @return {number}
*/
const maxProfit = (prices, fee) => {
let cash = 0;
let hold = -prices[0];
for (let price of prices) {
cash = Math.max(cash, hold + price - fee);
hold = Math.max(hold, cash - price);
}
return cash;
};