share my shortest code with one pass and O(1) space

  • 0
        int maxProfit(vector<int>& prices) {
            int buy_max{INT_MIN}, sell_1_max{0}, sell_2_max{0};
            for (const auto& p: prices) {
                int buy = sell_2_max - p;
                int sell = buy_max + p;
                sell_2_max = sell_1_max;
                sell_1_max = max(sell_1_max, sell);
                buy_max = max(buy_max, buy);
            return sell_1_max;

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