Leetcode 121 Solution

This article provides solution to leetcode question 121 (best-time-to-buy-and-sell-stock)
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https://leetcode.com/problems/best-time-to-buy-and-sell-stock

Solution

class Solution {
public:
    int maxProfit(vector<int>& prices) {
        int n = prices.size();
        if (prices.size() == 0)
            return 0;



        vector<int> a(n);
        for (int i = 0; i < n; i++)
            a[i] = i == 0 ? prices[i] : min(a[i - 1], prices[i]);



        int max_gain = 0;
        for (int i = 0; i < prices.size(); i++)
            max_gain = max(max_gain, prices[i] - a[i]);



        return max_gain;
    }
};