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This should be safe! (compare also algorithm of tarjan).

Plz note thiss should also work with sets which are bigger than just pairs.

use strict; use warnings; use Data::Dump qw/pp/; my @key_array = 'a' .. 'z'; my @set_array = ( ['a', 'b'], ['e','f'], ['f','g'] ); my (%neighbors,%group,%mark); # collect all neighbors per vertex for my $pair (@set_array) { for my $vert (@$pair){ push @{$neighbors{$vert}},@$pair; } } #pp \%neighbors; # mark all connected vertices with same group-id my $group=1; for my $vert (@key_array) { mark($vert,$group++); } #pp "group",\%group,"mark",\%mark; # sort result by size and alphabetically pp sort {@$b<=>@$a or $a->[0] cmp $b->[0]} values %group; sub mark { # recursivly (deep) mark neighbors my ($vert,$group)=@_; return if $mark{$vert}; $mark{$vert}=$group; push @{$group{$group}},$vert; for my $neighbor (@{$neighbors{$vert}}) { mark($neighbor,$group) } }


( ["e", "f", "g"], ["a", "b"], ["c"], ["d"], ["h"], ["i"], ["j"], ["k"], ["l"], ["m"], ["n"], ["o"], ["p"], ["q"], ["r"], ["s"], ["t"], ["u"], ["v"], ["w"], ["x"], ["y"], ["z"], )

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re: treat pairs, set as one item: looking for better way by LanX
in thread treat pairs, set as one item: looking for better way by remiah

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    [choroba]: or nobody bothered...
    [choroba]: The problem was bigger, as the test tried to call a method that didn't exist anymore
    [marinersk]: :: ducking ::
    [choroba]: because, someone renamed the method, but didn't notice it was used in the test, as the test was skipped
    [marinersk]: Well, if the method doesn't exist, it would be hard to pass the test.
    [choroba]: later, someone removed the new method, as all its usage places were safe, but didn't notice the test still used the old name
    [choroba]: fortunately, it wasn't that hard to replace the method and fix a few remaining failures due to the changes we did to the codebase over the years
    [marinersk]: choroba Sounds like a process improvement opportunity; tests may not all need to be run, but they should all be compiled with perl -c before check-in/promotion happens.
    [choroba]: so, now I have the test, so I can start making changes in the code. Back to the original ticket, yay!
    [marinersk]: I definitely love it when my $current_taask=& taskPop(); if ($current_task eq $original_task) { } is true.

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