class Solution {
public:
    /**
     * 
     * @param prices int整型vector 
     * @return int整型
     */
    int maxProfit(vector<int>& prices) {
        // write code here
        int profit = 0;
        int size = prices.size();
        for(int i=1; i<size; ++i){
            if(prices[i] >= prices[i-1]){
                profit += prices[i] - prices[i-1];
            }
        }
        return profit;
    }
};