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advent.go
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advent.go
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package advent2020
import (
"fmt"
"math"
"regexp"
"sort"
"strconv"
"strings"
"github.com/marjamis/advent/pkg/helpers"
)
func day1CheckListAddsTo2020(pointers []int, expenseReport []int) bool {
plus := expenseReport[pointers[0]]
for _, pointer := range pointers[1:] {
plus += expenseReport[pointer]
}
if plus == 2020 {
return true
}
return false
}
func day1MultiplyListValues(pointers []int, expenseReport []int) int {
multi := expenseReport[pointers[0]]
for _, pointer := range pointers[1:] {
multi *= expenseReport[pointer]
}
return multi
}
func Day1(expenseReport []int) int {
sort.Sort(sort.Reverse(sort.IntSlice(expenseReport)))
for index := range expenseReport {
for index2 := range expenseReport[index:] {
pointers := []int{index, index + index2}
if day1CheckListAddsTo2020(pointers, expenseReport) {
return day1MultiplyListValues(pointers, expenseReport)
}
}
}
return -1
}
func Day1Part2(expenseReport []int) int {
sort.Sort(sort.Reverse(sort.IntSlice(expenseReport)))
for index := range expenseReport {
for index2 := range expenseReport[index:] {
for index3 := range expenseReport[index2:] {
pointers := []int{index, index + index2, index2 + index3}
if day1CheckListAddsTo2020(pointers, expenseReport) {
return day1MultiplyListValues(pointers, expenseReport)
}
}
}
}
return -1
}
type Day2CheckOption int
const (
Day2CheckOptionGeneral = 0
Day2CheckOptionSpecial = 1
)
func day2GenerateConfiguration(policy string) (rangeLower int, rangeUpper int, character string, password string) {
split := strings.Split(policy, " ")
rant := strings.Split(split[0], "-")
// TODO error checking and change Atoi to ParseInt
rangeLower, _ = strconv.Atoi(rant[0])
rangeUpper, _ = strconv.Atoi(rant[1])
character = strings.Split(split[1], ":")[0]
password = split[2]
return
}
var day2checks = map[Day2CheckOption](func(int, int, string, string) bool){
Day2CheckOptionGeneral: (func(rangeLower int, rangeUpper int, character string, password string) bool {
numberOfInstances := strings.Count(password, character)
if numberOfInstances >= rangeLower && numberOfInstances <= rangeUpper {
return true
}
return false
}),
Day2CheckOptionSpecial: (func(rangeLower int, rangeUpper int, character string, password string) bool {
var X, Y bool
// The -1's are due to the task as the customer starts from 1 rather than 0.
if string(password[rangeLower-1]) == character {
X = true
}
if string(password[rangeUpper-1]) == character {
Y = true
}
if (X || Y) && !(X && Y) {
return true
}
return false
}),
}
func Day2(passwordPolicies []string, check Day2CheckOption) (count int) {
//TODO add a proper error check here
f := day2checks[check]
for _, policy := range passwordPolicies {
if f(day2GenerateConfiguration(policy)) {
count++
}
}
return
}
func day3Counter(tobMap [][]string, stepsDown int, stepsRight int) (count int) {
// TODO investigate other types here
// tobboganPosition = [2]int{0, 0}
x := 0
y := 0
for y < (len(tobMap) - 1) {
// Perform the step
// TODO hardcoded values
if x+stepsRight >= len(tobMap[0]) {
x = (x + stepsRight) - len(tobMap[0])
} else {
x += stepsRight
}
y += stepsDown
if y >= len(tobMap) {
return
}
// TODO create a debug option for the printing rather than default fmt. This way the CLI can only have it if applied and testing can have it enabled by default.
// fmt.Printf("X: %d, Y: %d\n", x, y)
if tobMap[y][x] == "#" {
count++
}
}
// fmt.Println()
return
}
func Day3(tobMap [][]string, runs [][]int) (multi int) {
// COMBAK the runs array is ambigious for inputs but first of pair is stepsDown and second is stepsRight. This should probably be fixed to a struct.
multi = 1
for _, run := range runs {
multi *= day3Counter(tobMap, run[1], run[0])
}
return
}
func Day4(passportData string, advancedValidation bool) (count int) {
type Validation struct {
Type string
MinimumValue int
MaximumValue int
}
requiredFields := []struct {
FieldName string
ValidationFunction (func(string) bool)
}{
{ // (Birth Year)
"byr",
func(input string) bool {
num, _ := strconv.Atoi(input)
return num <= 2002 && num >= 1920
},
},
{ // (Issue Year)
"iyr",
func(input string) bool {
num, _ := strconv.Atoi(input)
return num <= 2020 && num >= 2010
},
},
{ // (Expiration Year)
"eyr",
func(input string) bool {
num, _ := strconv.Atoi(input)
return num <= 2030 && num >= 2020
},
},
{ // (Height)
"hgt",
func(input string) bool {
//TODO fix
num, _ := strconv.Atoi(input[:len(input)-2])
if strings.Contains(input, "cm") {
if num >= 150 && num <= 193 {
return true
}
}
if strings.Contains(input, "in") {
if num >= 59 && num <= 76 {
return true
}
}
return false
},
},
{ // (Hair Color)
"hcl",
func(input string) bool {
re := regexp.MustCompile(`#[0-9a-f]{6}`)
return re.MatchString(input)
},
},
{ // (Eye Color)
"ecl",
func(input string) bool {
colours := []string{
"amb",
"blu",
"brn",
"gry",
"grn",
"hzl",
"oth",
}
for _, colour := range colours {
if input == colour {
return true
}
}
return false
},
},
{ // (Passport ID)
"pid",
func(input string) bool {
return len(input) == 9
},
},
// cid (Country ID)
}
for _, passport := range strings.Split(passportData, "\n\n") {
// fmt.Printf("Index: %d, Passport: %s\n", index, passport)
rfCheck := 0
out:
for _, rf := range requiredFields {
//TODO make into the RF list that way it's only compiled once
re := regexp.MustCompile(`(?m)` + rf.FieldName + `:(.*?)[\s\$]`)
t := passport + "$"
output := re.FindStringSubmatch(t)
if len(output) != 2 {
continue out
}
if advancedValidation && rf.ValidationFunction != nil && !rf.ValidationFunction(output[1]) {
// fmt.Printf("Invalid for: %s\n", rf.FieldName)
continue out
}
rfCheck++
}
// TODO think of a smarter way to do this.
if rfCheck == len(requiredFields) {
count++
}
// fmt.Println()
}
return
}
func day5Parser(lower int, upper int, direction rune) (int, int) {
// fmt.Printf("Lower: %d, Upper: %d\n", lower, upper)
lf := float64(lower)
uf := float64(upper)
val := int(lf + (math.RoundToEven(uf-lf) / 2))
if direction == 'F' || direction == 'L' {
return lower, val
}
return val, upper
}
func day5SeatId(seatLocation string) (id int) {
rowData := seatLocation[:7]
colData := seatLocation[7:10]
// fmt.Printf("Row: %s - Col: %s\n", rowData, colData)
// TODO this logic can be deduped a bit
l := 0
u := 127
for _, direction := range rowData {
l, u = day5Parser(l, u, direction)
// fmt.Printf("Index: %d, Lower: %d, Upper: %d\n", i+1, l, u)
}
bl := 0
bu := 7
for _, direction := range colData {
bl, bu = day5Parser(bl, bu, direction)
// fmt.Printf("Index: %d, Lower: %d, Upper: %d\n", i+1, bl, bu)
}
return ((u) * 8) + bu
}
func Day5(seatLocations []string) (id int) {
for _, seatLocation := range seatLocations {
if num := day5SeatId(seatLocation); num > id {
id = num
}
}
return
}
func Day5Part2(seatLocations []string) (id int) {
seatIds := []int{}
for _, seatLocation := range seatLocations {
// fmt.Printf("Seat Id: %d", day5SeatId(seatLocation))
seatIds = append(seatIds, day5SeatId(seatLocation))
}
sort.Sort(sort.IntSlice(seatIds))
seat := seatIds[0] - 1
for _, seatId := range seatIds {
// fmt.Printf("Index: %d, SeatId: %d\n", index, seatId)
if (seatId - seat) > 1 {
return seatId - 1
}
seat = seatId
}
return
}
func day6FindCount(declartionForm string, isEveryone bool) int {
// TODO investigate a better type here
questions := map[rune]int{}
persons := strings.Split(declartionForm, "\n")
for _, person := range persons {
fmt.Println(person)
for _, char := range person {
questions[char] += 1
}
}
count := len(questions)
if isEveryone {
count = 0
for _, question := range questions {
if question == len(persons) {
count++
}
}
fmt.Printf("Number of people: %d - Count: %d - Mapping: %+v\n---\n", len(persons), count, questions)
}
return count
}
func Day6(declartionForms string, isEveryone bool) (count int) {
forms := strings.Split(declartionForms, "\n\n")
for _, form := range forms {
count += day6FindCount(form, isEveryone)
}
return
}
type Contains struct {
key string
numberOf int
}
type Bag struct {
Contains []Contains
IsIn []string
}
//TODO improve logic so it can be returned/passed into the function specifically
var foundBags = []string{}
type Day7SearchOption int
const (
// TODO change to types or some other better method
Day7SearchOptionIsIn = 0
Day7SearchOptionContains = 1
)
func day7SearchIsIn(bags map[string]Bag, findBag string) {
for _, bag := range bags[findBag].IsIn {
fmt.Printf("Bag: %s\n", bag)
foundBags = append(foundBags, bag)
day7SearchIsIn(bags, bag)
}
return
}
func day7SearchContains(bags map[string]Bag, findBag string) (count int) {
for _, bag := range bags[findBag].Contains {
fmt.Printf("Bag: %s - Count: %d\n", bag.key, bag.numberOf)
if bag.numberOf != 0 {
count += bag.numberOf + (bag.numberOf * day7SearchContains(bags, bag.key))
}
}
return
}
func Day7(rulesList string, findBag string, typeOfCheck Day7SearchOption) (count int) {
// TODO this function is just shite, fix it up to be more elegant
rules := strings.Split(rulesList, "\n")
bags := map[string]Bag{}
for _, rule := range rules {
// fmt.Printf("Rule: %s\n", rule)
bag := strings.Split(rule, " bags contain ")[0]
// fmt.Printf("Bag: %s\n", bag)
if len(bag) < 1 {
continue
}
contains := strings.Split(rule, " bags contain ")[1]
re := regexp.MustCompile(`(.*? bag)s?[,.]`)
nc := re.FindAllStringSubmatch(contains, -1)
// fmt.Println("Contains: ")
currentBags := []Contains{}
fmt.Printf("NC Data: %+v\n\n", nc)
for _, n := range nc {
trmmed := strings.Trim(n[1], " ")
count, _ := strconv.Atoi(strings.Split(trmmed, " ")[0])
key := strings.Split(trmmed, " ")[1] + " " + strings.Split(trmmed, " ")[2]
// fmt.Println(key)
existingBag, ok := bags[key]
if !ok {
bags[key] = Bag{
nil,
[]string{
bag,
},
}
} else {
var isin = existingBag.IsIn
isin = append(isin, bag)
bags[key] = Bag{
existingBag.Contains,
isin,
}
}
currentBags = append(currentBags, Contains{
key,
count,
})
}
existingBag, ok := bags[bag]
if !ok {
bags[bag] = Bag{
currentBags,
nil,
}
} else {
contains := existingBag.Contains
contains = append(contains, currentBags...)
bags[bag] = Bag{
contains,
existingBag.IsIn,
}
}
}
// for key, bag := range bags {
// fmt.Printf("Bag '%s' info: %+v\n", key, bag)
// }
if typeOfCheck == Day7SearchOptionIsIn {
day7SearchIsIn(bags, findBag)
return len(helpers.RemoveDuplicates(foundBags))
} else {
return day7SearchContains(bags, findBag)
}
// fmt.Println(foundBags)
// for _, bag := range helpers.RemoveDuplicates(foundBags) {
// fmt.Printf("New bags %s\n", bag)
// }
return
}