template <size_t N>
using Matrix = std::array<std::array<int, N>, N>;

template <size_t N>
Matrix<N> create_square_matrix();

template <size_t N>
Matrix<N> square_matrix_multiply(const Matrix<N> &a, const Matrix<N> &b) {
 Matrix<N> result{};
 for (size_t i = 0; i < N; i++) {
   for (size_t j = 0; j < N; j++) {
     for (size_t k = 0; k < N; k++) {
       result[i][j] = result[i][j] + a[i][k] * b[k][j];
     }
   }
 }
 return result;
}

int main() {
   Matrix<1024> a = create_square_matrix<1024>();
   Matrix<1024> b = create_square_matrix<1024>();
   Matrix<1024> c = square_matrix_multiply(a, b);
   return 0;
}

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