#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

class Solution {
public:
    int maxProfit(vector<int>& prices) {

    }
};

int main()
{
    Solution solution;
    vector<int> input = {7,1,5,3,6,4};
    solution.maxProfit(input);
    return 0;
}