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Just another update

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This commit is contained in:
Ingy döt Net 2015-02-20 00:35:01 -05:00
parent a25938f123
commit 00a190b0a6
6591 changed files with 94363 additions and 23227 deletions
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94
Task/Knapsack-problem-Unbounded/Go/knapsack-problem-unbounded.go
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@ -3,68 +3,64 @@ package main
import "fmt"
type Item struct {
Name string
Value int
Weight, Volume float64
Name string
Value int
Weight, Volume float64
}
type Result struct {
Counts []int
Sum int
Counts []int
Sum int
}
func min(a, b int) int {
if a < b {
return a
}
return b
if a < b {
return a
}
return b
}
func Knapsack(items []Item, index int, weight, volume float64) (best *Result) {
if index == len(items) {
return &Result{make([]int, len(items)), 0}
}
itemValue := items[index].Value
itemWeight := items[index].Weight
itemVolume := items[index].Volume
maxCount := min(int(weight/itemWeight), int(volume/itemVolume))
for count := 0; count <= maxCount; count++ {
sol := Knapsack(items, index+1,
weight-float64(count)*itemWeight,
volume-float64(count)*itemVolume)
if sol != nil {
sol.Counts[index] = count
sol.Sum += itemValue * count
if best == nil || sol.Sum > best.Sum {
best = sol
}
}
}
return
func Knapsack(items []Item, weight, volume float64) (best Result) {
if len(items) == 0 {
return
}
n := len(items) - 1
maxCount := min(int(weight/items[n].Weight), int(volume/items[n].Volume))
for count := 0; count <= maxCount; count++ {
sol := Knapsack(items[:n],
weight-float64(count)*items[n].Weight,
volume-float64(count)*items[n].Volume)
sol.Sum += items[n].Value * count
if sol.Sum > best.Sum {
sol.Counts = append(sol.Counts, count)
best = sol
}
}
return
}
func main() {
items := []Item{
Item{"Panacea", 3000, 0.3, 0.025},
Item{"Ichor", 1800, 0.2, 0.015},
Item{"Gold", 2500, 2.0, 0.002},
}
var sumCount, sumValue int
var sumWeight, sumVolume float64
items := []Item{
{"Panacea", 3000, 0.3, 0.025},
{"Ichor", 1800, 0.2, 0.015},
{"Gold", 2500, 2.0, 0.002},
}
var sumCount, sumValue int
var sumWeight, sumVolume float64
result := Knapsack(items, 0, 25, 0.25)
result := Knapsack(items, 25, 0.25)
for i := range result.Counts {
fmt.Printf("%-8s x%3d -> Weight: %4.1f Volume: %5.3f Value: %6d\n",
items[i].Name, result.Counts[i], items[i].Weight*float64(result.Counts[i]),
items[i].Volume*float64(result.Counts[i]), items[i].Value*result.Counts[i])
for i := range result.Counts {
fmt.Printf("%-8s x%3d -> Weight: %4.1f Volume: %5.3f Value: %6d\n",
items[i].Name, result.Counts[i], items[i].Weight*float64(result.Counts[i]),
items[i].Volume*float64(result.Counts[i]), items[i].Value*result.Counts[i])
sumCount += result.Counts[i]
sumValue += items[i].Value * result.Counts[i]
sumWeight += items[i].Weight * float64(result.Counts[i])
sumVolume += items[i].Volume * float64(result.Counts[i])
}
sumCount += result.Counts[i]
sumValue += items[i].Value * result.Counts[i]
sumWeight += items[i].Weight * float64(result.Counts[i])
sumVolume += items[i].Volume * float64(result.Counts[i])
}
fmt.Printf("TOTAL (%3d items) Weight: %4.1f Volume: %5.3f Value: %6d\n",
sumCount, sumWeight, sumVolume, sumValue)
fmt.Printf("TOTAL (%3d items) Weight: %4.1f Volume: %5.3f Value: %6d\n",
sumCount, sumWeight, sumVolume, sumValue)
}