This is dense code. I don't really want to untangle it to discover what it does. (It reminds me a bit of golf code.) Here are some random comments:

There is 1 almost useful comment: 

# Hash table/dictionary for all the  groups

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...which doesn't explain much.

There are peculiar things, like: 

sub oh { map values %$_, @_ }

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which pulls the values out of a list of hashrefs. But then is used as: 

ins @$_ for map {xtend $_, qw(P E Pl)} (oh oh oh \%T);

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which assumes that there is a 3-level hash. Why not do all of that in the sub, and pass in a depth, or detect the depth?

Is the sample input the DATA? 

ins split /,\s*/ for <DATA>;

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How does it fail on the big file? Give a sample output where it's wrong (and right, if it's ever right).

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to Re: Perl code for finding shortest path not working on large files by QM
in thread Perl code for finding shortest path not working on large files by zing

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