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187
day20/main.go
187
day20/main.go
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@ -4,7 +4,6 @@ import (
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"bufio"
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_ "embed"
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"fmt"
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"os"
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"strings"
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aoc "go.sour.is/advent-of-code"
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@ -23,16 +22,9 @@ type result struct {
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func (r result) String() string { return fmt.Sprintf("%#v", r) }
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func run(scan *bufio.Scanner) (*result, error) {
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var forever bool
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if os.Getenv("AOC_FOREVER") == "1" {
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forever = true
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}
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m := &machine{}
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receivers := make(map[string][]string)
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m.Add("rx", &rx{})
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for scan.Scan() {
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text := scan.Text()
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@ -48,72 +40,46 @@ func run(scan *bufio.Scanner) (*result, error) {
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case strings.HasPrefix(name, "&"):
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name = strings.TrimPrefix(name, "&")
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m.Add(name, &conjuction{name: name, dest: dest})
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m.Add(name, &conjunction{name: name, dest: dest})
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}
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for _, d := range dest {
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// rx is present so enable pt 2
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if d == "rx" {
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m.Add("rx", &rx{})
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}
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receivers[d] = append(receivers[d], name)
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}
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}
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m.Setup(receivers)
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m.setup(receivers)
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result := &result{}
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if forever {
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i := 0
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defer func() {
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if p := recover(); p != nil {
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fmt.Printf("## Press %d FINISH %v ##", i, p)
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os.Exit(1)
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}
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}()
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for {
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if i%12345 == 0 {
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fmt.Printf("## Press %d ##\r", i)
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}
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m.Push(i)
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i++
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}
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}
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for i := 0; i < 4_0000; i++ {
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// fmt.Printf("\n## Press %d ##\n\n", i)
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for i := 0; i < 10_000; i++ { // need enough presses to find the best LCM values for each conjunction
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if i == 1000 {
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result.valuePT1 = m.highPulses * m.lowPulses
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}
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m.Push(i)
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}
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// fmt.Println("\n## SUMMARY ##")
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// fmt.Println("Sent", LOW, m.lowPulses)
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// fmt.Println("Sent", HIGH, m.highPulses)
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var lvalues []int
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// rx is present.. perform part 2.
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if rx, ok := receivers["rx"]; ok {
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tip := m.m[rx[0]].(*conjunction) // panic if missing!
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for _, p := range m.m {
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if p, ok := p.(*conjuction); ok && in(p.name, []string{"bk","tp","pt","vd"}) {
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var values []int
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for k, v := range p.pushes {
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for i, h := range makeHistory(v) {
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if i == 1 && len(h) > 3 && h[0] > 0 { //&& all(h[0], h[1:]...) {
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fmt.Println(p.name, k, i, h[0])
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values = append(values, h[0])
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}
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var lvalues []int
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for k, v := range tip.pushes {
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for i, h := range makeHistory(v) {
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if i == 1 && len(h) > 0 && h[0] > 0 {
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fmt.Println(tip.name, k, "frequency", h[0])
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lvalues = append(lvalues, h[0])
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}
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}
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max := aoc.Max(values[0], values...)
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fmt.Println(p.name, "MAX", max, values)
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lvalues = append(lvalues, max)
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}
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result.valuePT2 = aoc.LCM(lvalues...)
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fmt.Println(tip.name, "LCM", result.valuePT2, lvalues)
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}
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result.valuePT2 = aoc.LCM(lvalues...)
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fmt.Println("tg", "LCM", result.valuePT2, lvalues)
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// trace("rx", receivers)
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return result, nil
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}
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@ -124,36 +90,17 @@ const (
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HIGH signal = true
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)
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func (m signal) String() string {
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if m {
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return " >>-HIGH-> "
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}
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return " >>-LOW-> "
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}
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type message struct {
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signal
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from, to string
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}
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func (m message) String() string {
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return fmt.Sprint(m.from, m.signal, m.to)
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}
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type pulser interface {
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Pulse(message)
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SetMachine(*machine)
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}
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type machine struct {
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m map[string]pulser
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press int
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queue []message
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hwm int
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stop bool
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press int
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highPulses int
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lowPulses int
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}
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@ -176,13 +123,11 @@ func (m *machine) Send(msgs ...message) {
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}
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}
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}
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func (m *machine) Push(i int) {
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m.press = i
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m.Send(generate(LOW, "button", "broadcaster")...)
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m.processQueue(i)
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}
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func (m *machine) processQueue(i int) {
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// look for work and process up to the queue length. repeat.
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hwm := 0
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@ -204,7 +149,7 @@ func (m *machine) processQueue(i int) {
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// fmt.Println("")
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}
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}
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func (m *machine) Setup(receivers map[string][]string) {
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func (m *machine) setup(receivers map[string][]string) {
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for name, recv := range receivers {
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if p, ok := m.m[name]; ok {
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if p, ok := p.(interface{ Receive(...string) }); ok {
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@ -214,10 +159,12 @@ func (m *machine) Setup(receivers map[string][]string) {
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}
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}
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func (m *machine) Stop() {
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m.stop = true
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type pulser interface {
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Pulse(message)
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SetMachine(*machine)
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}
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// IsModule implements the machine registration for each module.
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type IsModule struct {
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*machine
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}
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@ -232,7 +179,6 @@ type broadcaster struct {
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func (b *broadcaster) Pulse(msg message) {
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b.Send(generate(msg.signal, "broadcaster", b.dest...)...)
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}
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func (b *broadcaster) String() string { return "br" }
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type flipflop struct {
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name string
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@ -248,70 +194,41 @@ func (b *flipflop) Pulse(msg message) {
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b.Send(generate(b.state, b.name, b.dest...)...)
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}
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}
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func (b *flipflop) String() string {
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return fmt.Sprintf("%s(%v)", b.name, b.state)
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}
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type conjuction struct {
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type conjunction struct {
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name string
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state map[string]signal
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dest []string
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pushes map[string][]int
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activate []int
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last map[string]int
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max map[string]int
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lcm int
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IsModule
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}
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func (b *conjuction) Receive(names ...string) {
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func (b *conjunction) Receive(names ...string) {
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if b.state == nil {
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b.state = make(map[string]signal)
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b.last = make(map[string]int)
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b.max = make(map[string]int)
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b.pushes = make(map[string][]int)
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}
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for _, name := range names {
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b.state[name] = false
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b.max[name] = int(^uint(0)>>1)
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b.pushes[name] = []int{}
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}
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}
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func (b *conjuction) Pulse(msg message) {
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if b.state == nil {
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b.state = make(map[string]signal)
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b.last = make(map[string]int)
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b.max = make(map[string]int)
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}
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func (b *conjunction) Pulse(msg message) {
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b.state[msg.from] = msg.signal
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if msg.signal {
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// collect frequency of pushes to esti,ate rate
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b.pushes[msg.from] = append(b.pushes[msg.from], b.press)
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b.last[msg.from] = b.press - b.last[msg.from]
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// vals := maps.Values(b.max)
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// if aoc.Min(vals[0], vals...) != 0 {
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// if lcm := aoc.LCM(vals...); lcm > 0 {
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// fmt.Printf("\nfound loop %s = %d %v\n", b.name, lcm, vals)
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// }
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// }
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}
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if all(HIGH, maps.Values(b.state)...) {
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b.activate = append(b.activate, b.press)
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b.Send(generate(LOW, b.name, b.dest...)...)
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return
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}
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b.Send(generate(HIGH, b.name, b.dest...)...)
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}
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func (b *conjuction) String() string {
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return fmt.Sprintf("%s(%v)", b.name, b.state)
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}
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type rx struct {
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IsModule
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@ -319,16 +236,12 @@ type rx struct {
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func (rx *rx) Pulse(msg message) {
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if !msg.signal {
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panic("pulse received")
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panic("pulse received") // will never happen...
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}
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}
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func (rx *rx) String() string { return "rx" }
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func all[T ~int|~bool](match T, lis ...T) bool {
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if len(lis) == 0 {
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return true
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}
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// helper funcs
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func all[T comparable](match T, lis ...T) bool {
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for _, b := range lis {
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if b != match {
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return false
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@ -345,35 +258,25 @@ func generate(t signal, from string, destinations ...string) []message {
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return msgs
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}
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func in(n string, haystack []string) bool {
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for _, h := range haystack {
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if n == h {
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return true
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}
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}
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return false
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}
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// makeHistory from day 9
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func makeHistory(in []int) [][]int {
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var history [][]int
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history = append(history, in)
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for {
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var diffs []int
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// for {
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var diffs []int
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current := history[len(history)-1]
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if len(current) == 0 { return nil }
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current := history[len(history)-1]
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for i := range current[1:] {
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diffs = append(diffs, current[i+1]-current[i])
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}
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history = append(history, diffs)
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if len(diffs) == 0 || aoc.Max(diffs[0], diffs[1:]...) == 0 && aoc.Min(diffs[0], diffs[1:]...) == 0 {
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break
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}
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for i := range current[1:] {
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diffs = append(diffs, current[i+1]-current[i])
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}
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history = append(history, diffs)
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// if len(diffs) == 0 || aoc.Max(diffs[0], diffs[1:]...) == 0 && aoc.Min(diffs[0], diffs[1:]...) == 0 {
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// break
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// }
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// }
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return history
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}
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@ -52,5 +52,5 @@ func TestSolution(t *testing.T) {
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t.Log(result)
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is.Equal(result.valuePT1, 819397964)
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is.Equal(result.valuePT2, 0)
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is.Equal(result.valuePT2, 252667369442479)
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}
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