买卖股票的最佳时机 II

Python

class Solution(object):
    def maxProfit(self, prices):
        """
        :type prices: List[int]
        :rtype: int
        """
        ans = 0
        for i in range(1, len(prices)):
            price = - prices[i-1] + prices[i]
            if price > 0:
                ans += price
        return ans