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chaoticset (2105)

chaoticset
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JAPH. (That's right -- I'm not Really Inexperienced any more.)

I'm not just here, I'm here [perlmonks.org], and here [javajunkies.org] too, I ramble randomly in my philosophical blog [blogspot.com] and my other blog [blogspot.com]. Soon I'll come in a convenient six-pack.

Journal of chaoticset (2105)

Thursday October 16, 2003
03:29 PM

Palindromy IV: Time Is Not On My Side

[ #15243 ]
I stuck a couple of counters and such into the code so that I could try to determine where it slows down, and found that it gets slower as time goes by. I suspect the size of the hash it's inserting into is the problem, not the basic processing time.

To that end, I'm considering using a database to hold the results, in case this thing will actually be fast enough that way. I'm not 100% this is going to work -- it's going to add the overhead of DBI to the mix -- but it's better than giving up.

If I'm overlooking something obvious, I'd love to know it.

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  • Perhaps using a nested array that indexes one character at a time would help. Each array would have a counter (to count the number of words that matched this far in) and 26 refs to additional arrays. There would be 3 starting arrays - one counts words that begin with a substring, one counts words that end with a (reversed) substring, and one counts words that contain a substring. The following does this. (However, this code does not tell you which words can be used to provide a traversal - the reversible