122. Best Time to Buy and Sell Stock II

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