#include <iostream>
#include <fstream>

#define IN_FILE1 "input1.txt"
#define IN_FILE2 "input2.txt"
#define OUT_FILE "output.txt"

using namespace std;

class Matrica {
    public:
        int n;
        int m;
        int** data;

        void allocate() {
            data = new int* [n];

            for (int i = 0; i < n; i++)
                data[i] = new int [m];
        }

        void destroy() {
            return;
            if (n && m) {
                for (int i = 0; i < n; i++)
                    delete data[i];
                delete data;
            }
        }

    public:
        Matrica() { n = m = 0; };

        Matrica(int _n, int _m) : n(_n), m(_m) { allocate(); }

        ~ Matrica() { destroy(); }

        void set(string filename) {
            ifstream ifs(filename);

            if (!ifs) {
                cout << "File does not open!" << endl;
                exit(1);
            }

            ifs >> n >> m;

            destroy();
            allocate();

            for (int i = 0; i < n; i++)
                for (int j = 0; j < m; j++)
                    ifs >> data[i][j];
        }

        void get(string filename) {
            ofstream ofs(filename);

            if (!ofs) {
                cout << "File does not created!" << endl;
                exit(1);
            }

            ofs << "n = " << n << " m = " << m << endl;
            ofs << "Matrix:" << endl;

            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++)
                    ofs << data[i][j] << " ";
                ofs << endl;
            }
        }

        Matrica operator * (const Matrica &x) { return mult(*this, x); }

        friend Matrica mult(const Matrica &a, const Matrica &b);
};

Matrica mult(const Matrica &a, const Matrica &b) {
    if (a.m != b.n) {
        cout << "Matrices cannot be multiplied!" << endl;
        exit(1);
    }

    Matrica c(a.n, b.m);

    for (int i = 0; i < c.n; i++)
        for (int j = 0; j < c.m; j++) {
            c.data[i][j] = 0;
            for (int k = 0; k < a.m; k++)
                c.data[i][j] += a.data[i][k] * b.data[k][j];
        }
    return c;
}

int main() {

    Matrica a, b, c;

    a.set(IN_FILE1);

    b.set(IN_FILE2);

    c = a * b;

    c.get(OUT_FILE);

    return 0;
}