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