Best Time to Buy and Sell Stockeasy

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

int maxProfit(vector<int>& prices) {
    // TODO: find the maximum profit from a single buy/sell
    return 0;
}

int main() {
    vector<int> a = {7, 1, 5, 3, 6, 4};
    vector<int> b = {7, 6, 4, 3, 1};
    cout << maxProfit(a) << endl; // 5
    cout << maxProfit(b) << endl; // 0
    return 0;
}