#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param prices int整型一维数组 
# @return int整型
#
class Solution:
    def maxProfit(self , prices: List[int]) -> int:
        # write code here
        n = len(prices)
        res = 0
        dp =[0]*(n+1)
        for i in range(2,n+1):
            dp[i] = prices[i-1]-min(prices[:i])
        return max(dp)