void obrocTabliceWLewo( int tablica[N][N] ) {
    int tmp[N][N];
    memcpy(tmp, tablica, N*N*sizeof(int));
    for (int j=0;j<N;j++) {
        for (int i=0;i<N;i++) {
            tmp[N-i-1][j] = tablica[j][i];
        }
    }
    memcpy(tablica, tmp, N*N*sizeof(int));
}