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i love these problems, YuckFoo. i think i should pick up one of these books you've been reading. i keep my skills sharp with martin gardner's puzzlers ( here's a book list. )

okay, so this code's a little evil :P

i should probably document it a bit.... here goes:

#!/usr/bin/perl use strict; use warnings; \$|++; # is using Algorithm::FastPermute cheating? i hope not. use Algorithm::FastPermute qw/ permute /; ## use Data::Dumper; # see what's inside... ( @ARGV == 2 and \$ARGV[0] < \$ARGV[1] ) # process arguments ? my( \$lower, \$upper ) = @ARGV : die 'usage: ' . \$0 . ' lower upper' . \$/; NUMBER: for my \$try ( \$lower..\$upper ) { # try each number within bounds my @digits = split //, '*' . \$try; # makes ( '*', 1, 2, 3, etc ) my @permutations; # holds permutations # push permutations onto array # unless the permutation has a '*' on either end permute { push @permutations, [ @digits ] unless @digits->[-1] eq '*' or @digits->[0] eq '*'; } @digits; ## # uncomment to see what's inside... ## print Dumper \@permutations; my %results = # product => operation pairs map { eval( \$_ ) || 0, \$_ } # create pair map { join( '', @{ \$_ } ) } # stringify the array @permutations; # for each permutation ## # uncomment to see what's inside... ## print Dumper \@permutations; defined \$results{ \$try } # if i found one && print( \$try, # print it ' is vampire (', \$results{ \$try }, # and how i got there ')', \$/ ) && next NUMBER; }

~Particle *accelerates*

In reply to Re: Vampire Numbers by particle
in thread Vampire Numbers by YuckFoo

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 [choroba]: Corion One day, you'll implement the support for window functions in SQLite. [Corion]: choroba: I admit I've thought about it ;) But I think I'll sooner hack up the Pg parser library to spit out a good parse tree and then hack that up to create Perl code :) [Corion]: But back when I last looked at the VM of SQLite it seemed way to basic to me to implement anything in it....

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