计算股票最大买卖的利润

在这里插入代码片class Solution {
public:
    int maxProfit(vector<int>& prices) 
    {
        int i=0,j=1,sum=0;
        if(prices.size()==1)
        return 0;
        while (j<=prices.size()-1)
        {
            if(prices[j]>prices[i])
            sum+=(prices[j]-prices[i]);
            i++;
            j++;
        }
        return sum;

    }
};