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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"io"
"math"
"strings"
)
func fs1(input io.Reader) (int, error) {
scanner := bufio.NewScanner(input)
var items []Item
level := -1
for scanner.Scan() {
level++
s := scanner.Text()
if s != "-" {
words := strings.Split(s, ",")
for _, word := range words {
del := strings.Index(word, "-")
name := word[:del]
if word[del+1] == 'g' {
items = append(items, Item{
level: level,
elevator: false,
name: name,
generator: true,
})
} else {
items = append(items, Item{
level: level,
elevator: false,
name: name,
generator: false,
})
}
}
}
}
cache = make(map[int]map[int]int)
defer func() { fmt.Println(nbcases) }()
return best(0, items, 0, 0), nil
}
var nbcases = 0
func formatKey(elevator int, items []Item) (int, int) {
a := 0
b := 0
ia := 0
ib := 0
for _, item := range items {
if item.generator {
a += item.level << ia
if item.elevator {
a += 1 << (ia + 2)
}
ia += 3
} else {
b += item.level << ib
if item.elevator {
b += 1 << (ib + 2)
}
ib += 3
}
}
return a, b + elevator<<60
}
// Generator, chip
var cache map[int]map[int]int
func addCache(elevator int, items []Item, cur int) {
a, b := formatKey(elevator, items)
v, exists := cache[a]
if !exists {
v = make(map[int]int)
cache[a] = v
}
v[b] = cur
}
func containsCache(elevator int, items []Item, cur int) bool {
a, b := formatKey(elevator, items)
v, exists := cache[a]
if !exists {
return false
}
v2, exists := v[b]
if !exists {
return false
}
return cur >= v2
}
func best(elevator int, items []Item, cur int, elevatorMoves int) int {
if elevator < 0 || elevator == 4 {
return math.MaxInt
}
updateElevatorLevel(elevator, items)
if allLastLevel(items) {
fmt.Println(cur)
return cur
}
if friedLevel(items, elevator) {
return math.MaxInt
}
if elevatorMoves >= 3 {
return math.MaxInt
}
if containsCache(elevator, items, cur) {
return math.MaxInt
}
addCache(elevator, items, cur)
nbcases++
min := math.MaxInt
elevatorLen := lenElevator(items)
if elevatorLen > 2 {
return math.MaxInt
}
if elevatorLen == 2 {
// Move
min = getmin(min, best(elevator+1, items, cur+1, 0))
updateElevatorLevel(elevator, items)
// Empty
for i, item := range items {
if item.elevator {
items[i].elevator = false
min = getmin(min, best(elevator, items, cur, elevatorMoves+1))
items[i].elevator = true
}
}
return min
}
if elevatorLen == 0 {
// Fill
for i, item := range items {
if item.level == elevator {
items[i].elevator = true
min = getmin(min, best(elevator, items, cur, elevatorMoves+1))
items[i].elevator = false
}
}
return min
}
if elevatorLen == 1 {
// Empty
for i, item := range items {
if item.elevator {
items[i].elevator = false
min = getmin(min, best(elevator, items, cur, elevatorMoves+1))
items[i].elevator = true
}
}
// Fill
for i, item := range items {
if !item.elevator && item.level == elevator {
items[i].elevator = true
min = getmin(min, best(elevator, items, cur, elevatorMoves+1))
items[i].elevator = false
}
}
// Move
min = getmin(min, best(elevator+1, items, cur+1, 0))
updateElevatorLevel(elevator, items)
min = getmin(min, best(elevator-1, items, cur+1, 0))
updateElevatorLevel(elevator, items)
return min
}
panic(elevatorLen)
}
func updateElevatorLevel(elevator int, items []Item) {
for i, item := range items {
if item.elevator {
items[i].level = elevator
}
}
}
func allLastLevel(items []Item) bool {
for _, item := range items {
if item.level != 3 {
return false
}
}
return true
}
func lenElevator(items []Item) int {
sum := 0
for _, item := range items {
if item.elevator {
sum++
}
}
return sum
}
func getmin(a, b int) int {
if a < b {
return a
}
return b
}
func friedLevel(items []Item, elevator int) bool {
m := make(map[string]bool)
power := false
for _, item := range items {
if item.level != elevator {
continue
}
_, exists := m[item.name]
if exists {
delete(m, item.name)
power = true
continue
}
m[item.name] = item.generator
}
atLeastOneMicrochip := false
atLeastOneGenerator := false
for _, generator := range m {
if generator {
atLeastOneGenerator = true
} else {
atLeastOneMicrochip = true
}
}
if atLeastOneMicrochip && power {
return true
}
return atLeastOneMicrochip && atLeastOneGenerator
}
type Item struct {
level int
elevator bool
name string
generator bool
}
func (i Item) String() string {
if i.generator {
return i.name + "-g" + fmt.Sprintf("-%d", i.level)
}
return i.name + "-m" + fmt.Sprintf("-%d", i.level)
}