Best Time to Buy and Sell Stock with Cooldown.cpp

#include <vector>
#include <climits>


using namespace std;



class Solution {
public:
    int maxProfit(vector<int>& prices)
    {
        int buy = INT_MIN;
        int pre_buy = 0;
        int sell = 0;
        int pre_sell = 0;
        for(int price: prices)
        {
            pre_buy = buy;
            buy = max(pre_sell - price, pre_buy);
            pre_sell = sell;
            sell = max(pre_buy + price, pre_sell);
        }
        return sell;
    }
};