#include <vector>
#include <iostream>
#include <algorithm>

using namespace std; 

int maxProduct (vector<int>numbers , int sub_size)
{
    // Sort numbers
    std::sort(numbers.begin(), numbers.end());
    int result = 1;
    // Loop over last sub_size elements
    for(auto ptr = numbers.end()-1; ptr >= numbers.end() - sub_size; ptr--){
        result *= *ptr;
    }
    return result;
}

int main(){
    std::vector<int> numbers = {1,2,3,4,5};
    std::cout << maxProduct(numbers, 3);
}