Leetcode Best Time to Buy and Sell Stock II

题意：给出股票价格，可以多次买入、卖出，求利润的最大值。

思路：只要股票价格上涨，就买入卖出。

class Solution {
public:
    int maxProfit(vector<int>& prices) {
        if(prices.size() == 0) return 0;
        
        int maxbuy = 0;
        for(int i =1; i < prices.size(); ++ i) {
            if(prices[i] > prices[i - 1]) maxbuy += (prices[i] - prices[i - 1]);
        }
        return maxbuy;
    }
};