75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"AoC2020/helper"
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"regexp"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
lineBreak := "\n"
|
||
|
|
args := os.Args[1:]
|
||
|
|
input, err := helper.GetFile(args[0])
|
||
|
|
if err != nil {
|
||
|
|
fmt.Println(err)
|
||
|
|
}
|
||
|
|
parsedInput := strings.Split(input, lineBreak+lineBreak)
|
||
|
|
rulesInput := strings.Split(parsedInput[0], lineBreak)
|
||
|
|
messagesInput := strings.Split(parsedInput[1], lineBreak)
|
||
|
|
var rules = make(map[string]string)
|
||
|
|
for _, val := range rulesInput {
|
||
|
|
cleanS := strings.Replace(val, "\"","",-1)
|
||
|
|
parsedRule := strings.Split(cleanS,": ")
|
||
|
|
rules[parsedRule[0]] = parsedRule[1]
|
||
|
|
}
|
||
|
|
regex := getSummedRule(rules,"0")
|
||
|
|
fmt.Println(regex)
|
||
|
|
count := getValidMessages(regex, messagesInput)
|
||
|
|
fmt.Println(count)
|
||
|
|
rules["8"] = rules["8"] + " +"
|
||
|
|
newRule11 := rules["11"]
|
||
|
|
for i:= 0; i< 10; i++{
|
||
|
|
newRule11 = "42 " + newRule11 + " 31"
|
||
|
|
rules["11"] = rules["11"] + " | " + newRule11
|
||
|
|
}
|
||
|
|
regex = getSummedRule(rules,"0")
|
||
|
|
fmt.Println(regex)
|
||
|
|
count = getValidMessages(regex, messagesInput)
|
||
|
|
fmt.Println(count)
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func getValidMessages(regex string, messagesInput []string) int {
|
||
|
|
r, _ := regexp.Compile("^" + regex + "$")
|
||
|
|
count := 0
|
||
|
|
for _, val := range messagesInput {
|
||
|
|
if r.MatchString(val) {
|
||
|
|
count++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return count
|
||
|
|
}
|
||
|
|
|
||
|
|
func getSummedRule(rules map[string]string, rule string) string{
|
||
|
|
r, _ := regexp.Compile("[0-9]")
|
||
|
|
if rule == "+"{
|
||
|
|
return rule
|
||
|
|
}
|
||
|
|
number := r.FindString(rules[rule])
|
||
|
|
if number == "" {
|
||
|
|
return rules[rule]
|
||
|
|
}
|
||
|
|
|
||
|
|
stringParts := strings.Split(rules[rule],"|")
|
||
|
|
newRule := ""
|
||
|
|
for _, val := range stringParts {
|
||
|
|
newRule += "|"
|
||
|
|
for _, s := range strings.Fields(val) {
|
||
|
|
newRule += getSummedRule(rules,s)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return "(" + newRule[1:] + ")"
|
||
|
|
}
|