class Solution {

public:

    /**

     * @param prices: Given an integer array

     * @return: Maximum profit

     */

    int maxProfit(vector<int> &prices) {

        // write your code here

        int n = prices.size();

        if (n <= 1) return 0;

        vector<int> trans;

        for (int i = 1; i <= n; i++)

            trans.push_back(prices[i] - prices[i-1]);

        int imax = 0, res = 0;

        for(int i = 0; i < n-1; i++){

            imax += trans[i];

            if (imax > res) res = imax;

            else if(imax < 0) imax = 0;

        }

        return res;

    }

};