Leetcode73: Best Time to Buy and Sell Stock II

Say you have an array for which the ith element is the price of a given stock on day i.

Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one and sell one share of the stock multiple times). However, you may not engage in multiple transactions at the same time (ie, you must sell the stock
before you buy again).

允许无限次无时间重叠的买卖，求最大收益，可以用贪婪法。

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