Function add

All Algorithms/strassen.cpp:47–53

int** add(int** M1, int** M2, int n) {
    int** temp = initializeMatrix(n);
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            temp[i][j] = M1[i][j] + M2[i][j];
    return temp;
}

int** subtract(int** M1, int** M2, int n) {
    int** temp = initializeMatrix(n);