Mastering Algorithms with Perl phần 8 pot

... exhaustive search. Encrypted Perl Code You can get Perl to execute code that has been encrypted! (No, not the perverse sort of Perl code that resembles line noise.) For Perl 5, you use the Filter ... ability to filter Perl source code before it is parsed by the Perl interpreter. This filtering can be used for many purposes: • macro expansion with cpp, m4, etc. • decompression w...

Ngày tải lên: 12/08/2014, 21:20

... ), 6 28, 6 38 derivatives, computing, 6 28- 629 Jacobian matrix, 629-631 derived graphs, 281 - 285 complement graph, 284 complete graph, 282 graph transpose, 282 DES (Data Encryption Standard), 5 28, ... 382 - 387 phonetic algorithms, 388 - 389 metaphone algorithm (Text: :Metaphone), 389 soundex algorithm (Text: :Soundex), 388 - 389 Rabin-Karp algorithm binary mask, 3 68 regular ex...

Ngày tải lên: 12/08/2014, 21:20

... Modules 351 9. Strings 353 Perl Builtins 354 String-Matching Algorithms 357 Phonetic Algorithms 388 Stemming and Inflection 389 Parsing 394 Compression 411 10. Geometric Algorithms 425 Distance 426 Area, ... temp: 84 secs (63.77 usr 0.57 sys = 64.33 cpu) no_temp: 98 secs (84 .92 usr 0.42 sys = 85 .33 cpu) The temporary variable results in a 25% speed increase—on my machine and...

Ngày tải lên: 12/08/2014, 21:20

... might still need and letting Perl& apos;s garbage collection deal with the predecessors. In this way, you can use a potentially huge number of elements of the list without requiring that they all ... sorting is, how to do it efficiently using Perl& apos;s own sort function, what comparing actually means, and how you can code your own sort algorithms with Perl. An Introduction to Sor...

Ngày tải lên: 12/08/2014, 21:20

... game was not yet complete). Less than half, 209, 088 , were wins for one player or the other. Only a relative few, 46, 080 , were draw positions—yet with good play by both players, the game is always ... follows:break @scores = qw(40 53 77 49 78 20 89 35 68 55 52 71); print percentile(\@scores, 90), "\n"; Page 145 This will be: 77 Beating O (N log N) All the sort algorithms s...

Ngày tải lên: 12/08/2014, 21:20

... fill the bits 3000 6199 of $vector with ASCII hexadecimal. # First, create set with the right size . . . $fill = Bit::Vector->new( 80 00 ); # fill it in from a 80 00-character string . . . $fill->from_string( ... ranging from (85 , 40) to (376, 142), and overlay it beginning at (79, 0) with ins(). The result is shown in Figure 7-13. There's no way to combine two Math::Mat...

Ngày tải lên: 12/08/2014, 21:20

... SSSPs and APSPs of different types of graphs are computed.break Page 333 Figure 8- 47. A graph and its SSSP Figure 8- 48. A graph and its APSP weights and paths Single-Source Shortest Paths Given ... used to reach the current vertex. Here is the algorithm's implementation in Perl: break Figure 8- 40. Figure 8- 39. Classifying the edges of a graph The classification of each edge as...

Ngày tải lên: 12/08/2014, 21:20

... check the final result (using for example Math::BigInt) and see that 280 , 284 ,5 78, 885 modulo 8, 355,967 does indeed equal 377 ,80 4. The good news is that the number now stays manageable. The bad news ... (256**4 % 83 55967) + 66 * (256**3 % 83 55967) + 67 * (256**2 % 83 55967) + 68 * 256 + 69 == 65 * 16712192 + 66 * 65 282 + 67 * 65536 + 68 * 256 + 69 == == 37 780 4 We...

Ngày tải lên: 12/08/2014, 21:20

... 1234.56 78; # prints "1234.5 68& quot; printf " %8. 4f", 1234.56 78; # prints "1234.56 78& quot; printf " %8. 5f", 1234.56 78; # prints "1234.56 780 " (width 8, precision ... 1234.56 78; # prints " 1235" printf " %8. 1f", 1234.56 78; # prints " 1234.6" printf " %8. 2f", 1234.56 78; # prints " 1234.57" p...

Ngày tải lên: 12/08/2014, 21:20

... hits with store sales, you look at the number of hits and sales total every month for five months:break Page 622 @hits = (23 78, 4024, 9696, 7314, 7710); @sales = (310.94, 315 .88 , 514.15, 500. 18, ... Probabilities Associated with Choices Number of left clicks, k Probability of exactly k left clicks Probability of at least k left clicks 8 1/256 1/256 = 0.0039 7 8/ 256 9/256 = 0.0352...

Ngày tải lên: 12/08/2014, 21:20