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main.go
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main.go
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package main
import (
"fmt"
"log"
"sort"
)
type SortBySensors []Delivery
func (a SortBySensors) Len() int { return len(a) }
func (a SortBySensors) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a SortBySensors) Less(i, j int) bool {
needed1 := a[i].GetNeededSensors()
needed2 := a[j].GetNeededSensors()
sum1 := 0
sum2 := 0
for _, sn := range SensorNames {
sum1 += needed1[sn]
sum2 += needed2[sn]
}
return sum1 < sum2
}
type SensorName string
const (
GPS SensorName = "gps"
Temp SensorName = "temp"
Weight SensorName = "weight"
Door SensorName = "door"
)
var SensorNames = []SensorName{GPS, Temp, Weight, Door}
type Delivery struct {
destination string
distance int
}
func NewDelivery(destination string, distance int) Delivery {
return Delivery{
destination: destination,
distance: distance,
}
}
func (d Delivery) GetNeededSensors() map[SensorName]int {
sensors := make(map[SensorName]int)
if d.distance < 10 {
sensors[GPS] = 1
sensors[Temp] = 1
} else if d.distance >= 10 && d.distance < 100 {
sensors[GPS] = 1
sensors[Temp] = 2
sensors[Weight] = 1
} else {
sensors[GPS] = 2
sensors[Temp] = 4
sensors[Weight] = 2
}
return sensors
}
type Scheduler struct {
resources map[SensorName]int
}
func NewScheduler(resources map[SensorName]int) Scheduler {
return Scheduler{
resources: resources,
}
}
func (s Scheduler) ScheduleDeliveries(deliveries []Delivery) []Delivery {
sort.Sort(SortBySensors(deliveries))
success := make([]Delivery, 0)
resources := make(map[SensorName]int)
for _, sn := range SensorNames {
resources[sn] = s.resources[sn]
}
for _, delivery := range deliveries {
failed := false
needed := delivery.GetNeededSensors()
for _, sn := range SensorNames {
if needed[sn] > resources[sn] {
if sn == Weight {
if (needed[sn] - resources[sn]) <= resources[Door] {
resources[Door] -= (needed[sn] - resources[sn])
resources[Weight] += (needed[sn] - resources[sn])
continue
}
} else if sn == Temp {
if (needed[sn] - resources[sn]) <= 2*resources[Door] {
resources[Door] -= (needed[sn] - resources[sn]) / 2
resources[Temp] += (needed[sn] - resources[sn]) / 2
continue
}
}
failed = true
break
}
}
if !failed {
for _, sn := range SensorNames {
resources[sn] -= needed[sn]
}
success = append(success, delivery)
}
}
return success
}
func main() {
{
d1 := NewDelivery("NY", 7)
d2 := NewDelivery("FL", 10)
d3 := NewDelivery("CA", 158)
m1 := d1.GetNeededSensors()
if m1[GPS] != 1 {
log.Fatal("GetNeededSensors is not working as expected")
}
if m1[Temp] != 1 {
log.Fatal("GetNeededSensors is not working as expected")
}
fmt.Println(d2.GetNeededSensors())
fmt.Println(d3.GetNeededSensors())
}
fmt.Println()
{
deliveryA := NewDelivery("A", 9)
deliveryB := NewDelivery("B", 15)
deliveryC := NewDelivery("C", 100)
scheduler := NewScheduler(map[SensorName]int{GPS: 2, Temp: 4, Weight: 2})
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryB, deliveryC}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryC, deliveryB}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryC, deliveryA, deliveryB}))
}
fmt.Println()
{
deliveryA := NewDelivery("A", 9)
deliveryB := NewDelivery("B", 15)
deliveryC := NewDelivery("C", 100)
scheduler := NewScheduler(map[SensorName]int{GPS: 0, Temp: 0, Weight: 0})
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryB, deliveryC}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryC, deliveryB}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryC, deliveryA, deliveryB}))
}
fmt.Println()
{
deliveryA := NewDelivery("A", 9)
deliveryB := NewDelivery("B", 15)
deliveryC := NewDelivery("C", 100)
scheduler := NewScheduler(map[SensorName]int{GPS: 4, Temp: 4, Weight: 2, Door: 2})
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryB, deliveryC}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryA, deliveryC, deliveryB}))
fmt.Println(scheduler.ScheduleDeliveries([]Delivery{deliveryC, deliveryA, deliveryB}))
}
}