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Re: find combinations

by Molt (Chaplain)
on Sep 06, 2005 at 10:45 UTC ( #489426=note: print w/replies, xml ) Need Help??

in reply to find combinations

Okay, the simplest approach here is to get all the combinations (via a convenient CPAN module.. Math::Combinatorics) and then filter those for the valid lances. There are almost certainly faster and more efficient ways to do this, but this seems to at least work.

A quick play with the module produced the following code, which at first glance seems to work:

use strict; use warnings; use Math::Combinatorics; my %mechs; while (<DATA>) { chomp; my @d = split /\s+/; $mechs{$d[0]} = { weight => $d[1], fraction => $d[2] }; } # find all lances with 5 members and 380t weight my @possible_lances = find_lances (3, 150); for my $lance (@possible_lances) { print "Found valid lance:\n"; my $lance_tonnage = 0; for my $mech (@$lance) { my $mech_weight = $mechs{$mech}->{weight}; print " $mech (${mech_weight}t)\n"; $lance_tonnage += $mech_weight; } print " Total tonnage: ${lance_tonnage}t\n"; } sub find_lances { my ($count, $max_tonnage) = @_; my @valid_lances; my $lance_combinations = Math::Combinatorics->new(count => $count, d +ata => [keys %mechs]); while (my @possible_lance = $lance_combinations->next_combination) { # Calculate the lance's tonnage my $tonnage = 0; $tonnage += $mechs{$_}->{weight} for @possible_lance; if ($tonnage <= $max_tonnage) { push @valid_lances, [@possible_lance]; } } return @valid_lances; } __DATA__ Flea 20 clan Commando 25 clan UrbanMech 30 clan Hollander 35 clan Jenner 35 clan Raven 35 clan Wolfhound 35 clan BlackHawk 50 clan Hunchback 50 clan Rifleman 60 clan Catapult 65 clan Loki 65 clan Thor 70 clan MadCat 75 clan Gargoyle 80 clan Victor 80 clan Zeus 80 clan Longbow 85 clan Warhawk 85 clan Mauler 90 clan Atlas 100 clan

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Re^2: find combinations
by holli (Monsignor) on Sep 06, 2005 at 11:02 UTC
    I have discovered that module while you were writing the node and came up with the following code (which is similar to yours).

    But thanks for your effort.

    holli, /regexed monk/

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Node Type: note [id://489426]
Discipulus is Corion reading 'Gory details of parsing quoted constructs'?..
[perldigious]: That's awesome erix. One of my work friends, who coincidentally convinced me to learn Perl originally, has a Finnish pen-pal. I showed him this and he immediately wanted to send it along to her.
[perldigious]: Also coincidentally, I'm currently in the middle of a winter storm that has dropped 1 foot of snow and is expected to drop another. I might have to adapt this for customers/vendors who come visit and put it at the beggining of every presentation I give.
[Discipulus]: the photo was removed... Cyrano de Berjerac was not of the same idea..

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