CartesianProductVector

// Cartesian Product C++

#include <iostream>
#include <vector>

using namespace std;

int size = 0;
std::vector<int> vector1;

void cartesianProduct(std::vector<int> &a, int &len);

int main() {
    cin >> size;

    cartesianProduct(vector1, size);

    return 0;
}

void cartesianProduct(std::vector<int> &a, int &len) {
    int length = len;
    int element = 0;
    for(int i = 0; i < length; i++) {
        cin >> element;
        vector1.push_back(element);
    }

    for(int i = 0; i < vector1.size(); i++) {
        for(int j = 0; j < vector1.size(); j++) {
            int number1 = vector1[i];
            int number2 = vector1[j];

            int sum = number1 * number2;
            cout << sum << " ";
        }
    }
}