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yeah, first "*" never tries 0. (update: hmm, no, it does try, for 10.. then I don't know why..) But if you actually specify the max number of matches
my $choices = join "\n ", map { "( .{$_} (?{ my \%r = \%{\$^R}; \$r{$_}++; +{ \%r } }) ){0, +".(int($amount/$_))."}" } @bills;
it works fine:
12:28pm /home/Ivancho/bin> probichka.pl 20 (?x-ism: ^ (?{ +{} }) ( .{1} (?{ my %r = %{$^R}; $r{1}++; +{ %r } }) ){0,20} ( .{5} (?{ my %r = %{$^R}; $r{5}++; +{ %r } }) ){0,4} ( .{10} (?{ my %r = %{$^R}; $r{10}++; +{ %r } }) ){0,2} ( .{20} (?{ my %r = %{$^R}; $r{20}++; +{ %r } }) ){0,1} ( .{50} (?{ my %r = %{$^R}; $r{50}++; +{ %r } }) ){0,0} ( .{100} (?{ my %r = %{$^R}; $r{100}++; +{ %r } }) ){0,0} $ (?{ push(@matches, $^R) }) (?!) ) $VAR1 = [ { '1' => 20 }, { '1' => 15, '5' => 1 }, { '1' => 10, '5' => 2 }, { '1' => 10, '10' => 1 }, { '1' => 5, '5' => 3 }, { '1' => 5, '10' => 1, '5' => 1 }, { '5' => 4 }, { '10' => 1, '5' => 2 }, { '10' => 2 }, { '20' => 1 } ];

In reply to Re^2: puzzle: how many ways to make $100 by ivancho
in thread puzzle: how many ways to make $100 by davidj

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