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package main
import (
"fmt"
"os"
"slices"
"sort"
"strconv"
"strings"
)
type SafetyManual struct {
pageOrderingRules [][2]int
updates [][]int
}
func (s SafetyManual) String() string {
var builder strings.Builder
// Format pageOrderingRules
builder.WriteString("Page Ordering Rules: [")
for i, rule := range s.pageOrderingRules {
if i > 0 {
builder.WriteString(", ")
}
builder.WriteString(fmt.Sprintf("[%d, %d]", rule[0], rule[1]))
}
builder.WriteString("]\n")
// Format updates
builder.WriteString("Updates: [")
for i, update := range s.updates {
if i > 0 {
builder.WriteString(", ")
}
builder.WriteString("[")
for j, val := range update {
if j > 0 {
builder.WriteString(", ")
}
builder.WriteString(fmt.Sprintf("%d", val))
}
builder.WriteString("]")
}
builder.WriteString("]")
return builder.String()
}
func FileRead(path string) string {
file, err := os.ReadFile(path)
if err != nil {
fmt.Println("Couldn't Read file: ", err)
}
return string(file)
}
func parseInput(data string) SafetyManual {
section := strings.Split(data, "\n\n")
first_section := strings.Split(section[0], "\n")
second_section := strings.Split(section[1], "\n")
var pageOrderingRules [][2]int
var updates [][]int
for _, rule := range first_section {
pages := strings.Split(rule, "|")
pageOne, _ := strconv.Atoi(pages[0])
pageTwo, _ := strconv.Atoi(pages[1])
arr := [2]int{pageOne, pageTwo}
pageOrderingRules = append(pageOrderingRules, arr)
}
for _, line := range second_section {
line := strings.Split(line, ",")
var update []int
for _, ele := range line {
ele, _ := strconv.Atoi(ele)
update = append(update, ele)
}
updates = append(updates, update)
}
return SafetyManual{
pageOrderingRules: pageOrderingRules,
updates: updates,
}
}
func filter_relevant_rules(s *SafetyManual, update *[]int) [][2]int {
var filtered_rules [][2]int
for _, rule := range s.pageOrderingRules {
if slices.Contains(*update, rule[0]) && slices.Contains(*update, rule[1]) {
filtered_rules = append(filtered_rules, rule)
}
}
return filtered_rules
}
func makeProperList(items [][2]int) []int {
counter := make(map[int]int)
for _, item := range items {
counter[item[0]]++
if _, exists := counter[item[1]]; !exists {
counter[item[1]] = 0
}
}
var sorted [][2]int
for val, fq := range counter {
arr := [2]int{fq, val}
sorted = append(sorted, arr)
}
sort.Slice(sorted, func(i, j int) bool {
return sorted[i][0] > sorted[j][0]
})
var properList []int
for _, x := range sorted {
if len(x) == 0 {
break
}
properList = append(properList, x[1])
}
return properList
}
func solve_part_one(data string) int {
section := parseInput(data)
ans := 0
for _, update := range section.updates {
filtered_rules := filter_relevant_rules(§ion, &update)
properList := makeProperList(filtered_rules)
flag := true
for i := range properList {
if properList[i] != update[i] {
flag = false
break
}
}
if flag {
ans += update[len(update)/2]
}
}
return ans
}
func solve_part_two(data string) int {
section := parseInput(data)
ans := 0
for _, update := range section.updates {
filtered_rules := filter_relevant_rules(§ion, &update)
properList := makeProperList(filtered_rules)
flag := true
for i := range properList {
if properList[i] != update[i] {
flag = false
break
}
}
if !flag {
ans += properList[len(properList)/2]
}
}
return ans
}
func main() {
test := FileRead("../input/day05.test")
prod := FileRead("../input/day05.prod")
fmt.Println("Part_1 test: ", solve_part_one(test))
fmt.Println("Part_1 prod: ", solve_part_one(prod))
fmt.Println("Part_2 test: ", solve_part_two(test))
fmt.Println("Part_2 prod: ", solve_part_two(prod))
}
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