122. 买卖股票的最佳时机 II

122. 买卖股票的最佳时机 II 题目描述

方法一：峰谷法

class Solution:
    def maxProfit(self, prices: List[int]) -> int:
        if len(prices) == 0:
            return 0
        
        preP = -1
        buyP = prices[0]
        
        sumP = 0 # 总利润
        
        for p in prices:
            if preP == -1:
                preP = p
            else:
                if p  int:
        if len(prices) == 0:
            return 0
        
        preP = -1
        
        sumP = 0 # 总利润
        
        for p in prices:
            if preP != -1 :
                sumP += max(0, p - preP)
                    
            preP = p
        
        return sumP