class Solution:
    def maxProfit(self, prices: List[int]) -> int:
        result = 0
        buy_idx = 0
        sell_idx = 0
        for i in range(1, len(prices)):
            if prices[i] >= prices[sell_idx]:
                sell_idx = i
            else:
                if sell_idx > buy_idx:
                    result += prices[sell_idx] - prices[buy_idx]
                sell_idx = buy_idx = i
        if sell_idx > buy_idx:
            result += prices[sell_idx] - prices[buy_idx]
        return result