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advent20.go
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advent20.go
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package main
import("fmt";"bufio";"os";"strings")
type gate struct{
t string
status int
routes []string
emit int
inputs map[string]int
}
func main(){
fmt.Println("Input coordinates:")
gates := make(map[string]gate)
init_ := make(map[string]int)
reader:= bufio.NewReader(os.Stdin)
for{
s,_ := reader.ReadString('\n')
s=strings.TrimSpace(s)
s=strings.ReplaceAll(s,",","")
if(s=="end"){break}
ss := strings.Split(s," ")
name := "broadcaster"
t := "start"
if(ss[0]!="broadcaster"){
name = string(ss[0][1:])
t = string(ss[0][0])
}
r := ss[2:]
gates[name] = gate{t,0,r,0,init_}
}
//fmt.Println(gates)
for i,g := range gates{
if(g.t=="&"){
//fmt.Println("Adding",i,g)
m := make(map[string]int)
for ii,gg := range gates{
for _,ggg := range gg.routes{
if(ggg==i){
//fmt.Println("Found",ii,gg)
m[ii] = 0
}
}
}
g.inputs = m
gates[i] = g
}
}
//fmt.Println(gates)
var emitting []string
lows:=0
highs:=0
rx := 0
for i:=0;i<1000;i++{
lows++
emitting = append(emitting,"broadcaster")
for(len(emitting)>0){
rx = 0
for _,i := range emitting{
pulse := gates[i].emit
for _,j := range gates[i].routes{
if(pulse==1){
highs++
}else if(pulse==0){
lows++
if(j=="rx"){rx++}
}
t := gates[j].t
status := gates[j].status
g := gates[j]
switch t{
case "%":
if(pulse==1){
}else if(pulse==0&&status==1){
g.status = 0
g.emit = 0
gates[j] = g
emitting = append(emitting,j)
}else if(pulse==0&&status==0){
g.status = 1
g.emit = 1
gates[j] = g
emitting = append(emitting,j)
}
case "&":
ii := g.inputs
ii[i] = pulse
g.inputs = ii
gates[j] = g
sig := 0
for _,in := range gates[j].inputs{
if(in==0){
sig=1
}
}
g.emit = sig
gates[j] = g
emitting = append(emitting,j)
}
}
emitting = emitting[1:]
}
if(rx==1){
fmt.Println("rx received only 1 pulse at:",i)
break
}
}
}
fmt.Println(lows,highs,lows*highs)
}