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package main | |
import "fmt" | |
type item struct { | |
name string | |
gewicht int | |
wert int | |
} | |
type rucksack []item | |
var items []item | |
var maxGewicht int | |
var ergebnis rucksack | |
func (r rucksack) gewicht() int { | |
var gewicht int | |
for _, v := range r { | |
gewicht = gewicht + v.gewicht | |
} | |
return gewicht | |
} | |
func (r rucksack) wert() int { | |
var wert int | |
for _, v := range r { | |
wert = wert + v.wert | |
} | |
return wert | |
} | |
func main() { | |
maxGewicht = 30 | |
items := []item{ | |
{"Horst", 6, 10}, | |
{"karl", 2, 7}, | |
{"Hans", 6, 4}, | |
{"Otto", 5, 1}, | |
{"Ernst", 5, 3}, | |
{"Müller", 5, 4}, | |
{"Egon", 4, 6}, | |
{"Harald", 7, 6}, | |
{"Nils", 4, 5}, | |
{"Bibi", 1, 3}, | |
{"Holger", 6, 7}, | |
{"Abraham", 8, 5}, | |
{"Gondolf", 3, 2}, | |
{"Bertram", 5, 9}, | |
{"Baltasar", 7, 6}, | |
{"Torben", 3, 5}, | |
{"Willi", 4, 4}, | |
} | |
var ruck rucksack | |
untersuche(ruck, items) | |
fmt.Println("Eingangsgrösse:", items) | |
fmt.Println("MaxGewicht", maxGewicht) | |
fmt.Println("Ergebnis:", ergebnis) | |
fmt.Println("Gesamtgewicht:", ergebnis.gewicht()) | |
fmt.Println("Gesamtwert:", ergebnis.wert()) | |
} | |
func untersuche(ruck rucksack, rest []item) { | |
for i, v := range rest { | |
if ruck.gewicht()+v.gewicht <= maxGewicht { | |
var neuerRest []item = make([]item, 0, len(rest)-1) | |
// The next line (not commented out) is working. If I do something of the following the program needs much time, and I don't know why | |
// var neuerRucksack rucksack = make([]item, 0, len(ruck)) // not working - because copy() needs the destination to have enough length (not just capacity) | |
// var neuerRucksack rucksack = make([]item, len(ruck)+1) // not working - because there will be a new zerovalue inserted. append() will add an item after the zerovalueitem | |
// var neuerRucksack rucksack = make([]item, 0, len(ruck)+1) // not working - because copy() needs the destination to have enough length (not just capacity) | |
var neuerRucksack rucksack = make([]item, len(ruck)) | |
neuerRest = append(neuerRest, rest[0:i]...) | |
neuerRest = append(neuerRest, rest[i+1:]...) | |
copy(neuerRucksack, ruck) | |
neuerRucksack = append(neuerRucksack, v) | |
if neuerRucksack.wert() > ergebnis.wert() { | |
ergebnis = neuerRucksack | |
} | |
untersuche(neuerRucksack, neuerRest) | |
} | |
} | |
} |
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