Best Time to Buy and Sell Stock II @leetcode

int maxProfit(vector<int> &prices) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        int i;
        int res=0;
        if(prices.size() <=1)
        {
            return 0;
        }
        for(i = 1;i<prices.size();++i)
        {
            if(prices[i] > prices[i-1])
                res+=(prices[i]-prices[i-1]);
        }
        return res;
    }

=有些描述可能比我们想象的要复杂。