Best Time to Buy and Sell Stock

class Solution {
public:
    int maxProfit(vector<int>& prices) {
        int n=prices.size();
        int max_profit=0,profit=0, prev_min=INT_MAX;
        for(int i=0;i<n;i++)
        {
            if(prev_min>prices[i])
            {
                prev_min=prices[i];
                
            }
            profit=prices[i]-prev_min;
            if(max_profit<profit)
            {
                max_profit=profit;
            }
        }
        return max_profit;
    }
};