Leetcode 122. Best Time to Buy and Sell Stock II

只要能卖就马上卖,最后就是最优解.

因为如果捂着不卖,后面再卖,不会更优的.比如:[1, 7, 2, 3, 6, 7, 6, 7]这组数据,根据下图(图来自leetcode官方题解)A+B+C=D.遇到能卖的就卖就好.

class Solution:
    def maxProfit(self, prices: List[int]) -> int:
        if not prices: return 0
        ans=0
        for i in range(1,len(prices)):
            if prices[i]>prices[i-1]:
                ans+=prices[i]-prices[i-1]
        return ans