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I would advise to avoid actually removing elements.

Instead have multidimensional hash of column and row.

You can use this multidimensional hash to record

whether a given index has already been supplied before.

Note the use of a closure to make the function stateful.

That is the reason for the reset_hash function.

You must be able to reset the hash for another run.

## just a sketch my %columns; ## to associate columns with ## column numbers # ## $columns{1} should return ## a reference to the ## first column list { ## closure cleanliness my $seen; ## keeps track of what we have seen ## used to reset hash within closure between runs sub reset_hash{ undef $seen } ##function expects column number sub find_and_dont_actually_remove_but_say_we_did{ my $column_number = shift; my $column = $columns{$column_number}; ## keeping as a referen +ce to ## avoid obscene copy-p +asta my $rand; until (not $seen->{$column_number}->{$rand = int(rand(@$column +))}){ ## nothing to see here } $seen->{$column_number}->{$rand} = "looks familiar"; return $column->[$rand] } }

In reply to Re: Table shuffling challenge by protist
in thread Table shuffling challenge by glow_gene

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