int **puzzle;

  puzzle = (int **) malloc(N * sizeof(int *));
  if (!puzzle) {
    fprintf(stderr, "Error allocating memory for translation.\n");
    exit(0);
  }

  for (i=0; i<N; i++) {
    puzzle[i] = (int *) malloc(N * sizeof(int));
    if (!puzzle[i]) {
      fprintf(stderr, "Error allocating memory for translation.\n");
    }
  }