class Solution {
public:
  //收益最大,并且没有手续费,可以无限交易,只要遇到升那么就赚一笔,
    int maxProfit(vector<int>& prices) {
        int ans=0;
        
        int n = prices.size();
        for(int i=n-2; i>=0; --i){
            if(prices[i] < prices[i+1]){
                ans += (prices[i+1] - prices[i]);
            }
        }

        return ans;
    }
};