Created
January 27, 2011 16:57
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class knapsackItem{ | |
has string $!name; has int $!weight;has int $!unit | |
method ToString(-->string) { | |
return self.name ~ ' ' ~ self.weight ~ ' ' ~ self.unit | |
} | |
} | |
sub makeItem(string $n, int $w, int $u --> knapsackItem) { | |
my $i = knapsackItem.new; | |
$i.name = $n; $i.weight = $w; $i.unit = $u; | |
return $i | |
} | |
sub func(List[knapsackItem] @a, int $w, int $v --> List[knapsackItem]){ | |
#say($w ~ ' ' ~ $v); | |
if ($w == 0 || @a.Count == 0) { | |
my $z = List[knapsackItem].new(); | |
$z.Add(makeItem('',0,$v)); | |
return $z; | |
} | |
my @rest = @a.GetRange(1, @a.Count - 1); | |
my $i = @a[0]; | |
my @skip = func(@rest,$w,$v); | |
if ($w >= $i.weight) { # next one fits | |
my @put = func( @rest,$w - $i.weight,$v + $i.unit); | |
if (@put[0].unit > @skip[0].unit) { | |
my @rr = @put.GetRange(0, @put.Count); | |
@rr.Add($i); | |
return @rr | |
} | |
} | |
return @skip | |
} | |
my $MAX_WEIGHT = 400; | |
my $l = List[knapsackItem].new; | |
$l.Add(makeItem('map',9,150)); | |
$l.Add(makeItem('compass',13,35)); | |
$l.Add(makeItem('water',153,200)); | |
$l.Add(makeItem('sandwich',50,160)); | |
$l.Add(makeItem('glucose',15,60)); | |
$l.Add(makeItem('tin',68,45)); | |
$l.Add(makeItem('banana',27,60)); | |
$l.Add(makeItem('apple',39,40)); | |
$l.Add(makeItem('cheese',23,30)); | |
$l.Add(makeItem('beer',52,10)); | |
$l.Add(makeItem('suntan cream',11,70)); | |
$l.Add(makeItem('camera',32,30)); | |
$l.Add(makeItem('T-shirt',24,15)); | |
$l.Add(makeItem('trousers',48,10)); | |
$l.Add(makeItem('umbrella',73,40)); | |
$l.Add(makeItem('waterproof trousers',42,70)); | |
$l.Add(makeItem('waterproof overclothes',43,75)); | |
$l.Add(makeItem('note-case',22,80)); | |
$l.Add(makeItem('sunglasses',7,20)); | |
$l.Add(makeItem('towel',18,12)); | |
$l.Add(makeItem('socks',4,50)); | |
$l.Add(makeItem('book',30,10)); | |
my @res = func($l,$MAX_WEIGHT,0); | |
@res.RemoveAt(0); | |
my $w = 0; | |
my $v = 0; | |
loop (my $k = 0; $k < @res.Count; $k++) { say(@res[$k]); $w = $w + @res[$k].weight; $v = $v + @res[$k].unit } | |
say("value: " ~ $v ~ " weight: " ~ $w); |
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