LeetCode in Kotlin

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

Medium

You are given an array prices where prices[i] is the price of a given stock on the ith day, and an integer fee representing a transaction fee.

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).

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

Constraints:

• 1 <= prices.length <= 5 * 104
• 1 <= prices[i] < 5 * 104
• 0 <= fee < 5 * 104

Solution

class Solution {
    fun maxProfit(prices: IntArray, fee: Int): Int {
        var cash = 0
        var hold = -prices[0]
        for (i in 1 until prices.size) {
            cash = cash.coerceAtLeast(hold + prices[i] - fee)
            hold = hold.coerceAtLeast(cash - prices[i])
        }
        return cash
    }
}

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