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2023 Day 4 Complete!

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Brian Buller 2023-12-04 08:54:52 -06:00
parent 4fe4929cca
commit 38a74e36d9
5 changed files with 451 additions and 2 deletions
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Card 195: 38 21 8 62 68 50 32 31 92 11 | 32 30 62 38 1 28 21 92 61 73 19 50 49 86 66 60 68 43 31 11 57 82 6 47 8
Card 196: 94 60 26 40 86 38 34 63 88 62 | 3 20 69 49 16 65 4 12 19 2 13 86 6 75 38 50 22 17 28 64 29 88 72 98 52
Card 197: 10 95 30 68 35 36 84 48 57 41 | 70 74 76 56 77 31 25 86 54 91 55 2 57 97 26 44 12 23 15 13 50 10 82 65 98
Card 198: 75 36 27 87 31 34 77 74 95 69 | 75 11 36 70 69 34 45 16 43 61 95 27 81 85 77 29 74 31 87 8 49 94 37 40 3
Card 199: 16 63 44 31 14 38 46 81 64 94 | 48 78 83 19 52 91 96 51 11 1 66 45 14 61 8 16 5 99 55 54 79 4 71 41 60
Card 200: 6 38 13 5 89 32 29 52 48 58 | 29 1 86 79 55 28 98 44 89 4 21 84 3 20 71 48 95 72 14 69 31 39 6 33 13
Card 201: 93 62 78 75 26 45 90 92 7 9 | 58 57 32 56 45 52 26 99 28 30 35 2 24 33 8 67 97 65 60 21 15 98 78 23 38
Card 202: 11 72 93 47 60 35 85 78 26 20 | 64 76 9 13 31 3 4 90 33 73 63 70 25 30 29 98 7 71 92 68 99 74 52 43 62
Card 203: 88 3 9 18 73 10 87 65 17 42 | 33 80 20 61 44 96 6 88 10 47 72 99 71 50 95 21 87 17 34 81 51 2 65 19 36
Card 204: 28 8 64 35 68 84 51 1 58 53 | 68 76 79 75 18 89 90 69 25 72 58 71 83 56 82 32 93 99 16 53 64 6 84 86 98
Card 205: 45 41 57 2 55 54 96 19 46 89 | 13 64 57 20 72 27 21 81 40 75 22 61 46 99 68 89 82 42 67 55 70 39 78 88 15
Card 206: 42 38 95 66 18 93 79 45 49 37 | 80 61 43 70 31 17 13 16 49 73 20 44 90 5 39 97 82 15 68 14 57 21 72 35 79
Card 207: 91 28 69 89 54 6 60 19 44 77 | 27 94 51 47 46 84 99 31 16 58 92 80 67 95 73 5 12 88 40 18 41 72 24 93 39
Card 208: 9 37 78 74 26 99 76 48 16 54 | 98 46 20 92 83 52 1 44 84 41 61 66 74 70 69 71 18 68 77 24 49 31 6 25 50
Card 209: 2 10 11 47 25 81 75 61 27 4 | 79 45 43 29 55 16 91 68 88 52 90 21 13 37 59 31 5 1 14 17 86 84 64 60 70

104
2023/day04/main.go Normal file
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@ -0,0 +1,104 @@
package main
import (
"fmt"
"math"
"strings"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
part1(inp)
fmt.Println()
part2(inp)
}
func part1(input []string) {
var total int
for i := range input {
total += cardFromLine(input[i]).Value()
}
fmt.Println("# Part 1")
fmt.Println(total)
}
func part2(input []string) {
cards := make(map[int]*Card)
for i := range input {
c := cardFromLine(input[i])
cards[c.id] = c
}
result := len(cards)
for _, card := range cards {
result += card.TotalCardsWon(cards)
}
fmt.Println("# Part 2")
fmt.Println(result)
}
type Card struct {
id int
winners []int
numbers []int
winsCards []int
totalCardsWon int
}
func (c Card) String() string {
return fmt.Sprintf("Card %d: %v | %v", c.id, c.winners, c.numbers)
}
func cardFromLine(input string) *Card {
pts := strings.Fields(input)
ret := Card{id: h.Atoi(pts[1]), totalCardsWon: -1}
winners := true
for _, s := range pts[2:] {
if s == "|" {
winners = false
} else {
if winners {
ret.winners = append(ret.winners, h.Atoi(s))
} else {
ret.numbers = append(ret.numbers, h.Atoi(s))
}
}
}
for _, w := range ret.winners {
for _, n := range ret.numbers {
skip := h.IntSliceContains(ret.winsCards, w)
if n == w && !skip {
ret.winsCards = append(ret.winsCards, w)
}
if skip {
break
}
}
}
return &ret
}
func (c *Card) Value() int {
return int(math.Pow(2, float64(len(c.winsCards)-1)))
}
func (c *Card) TotalCardsWon(cm map[int]*Card) int {
if c.totalCardsWon != -1 {
return c.totalCardsWon
}
result := len(c.winsCards)
// TODO: It doesn't with cards that match the ID,
// it wins X cards increasing from the current cards ID
// where x is the number of winning numbers matched
for i := 1; i <= len(c.winsCards); i++ {
if v, ok := cm[c.id+i]; ok {
result += v.TotalCardsWon(cm)
}
}
c.totalCardsWon = result
return result
}

123
2023/day04/problem Normal file
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@ -0,0 +1,123 @@
Advent of Code
br0xen (AoC++) 8*
--- Day 4: Scratchcards ---
The gondola takes you up. Strangely, though, the ground doesn't seem to be coming with you; you're not climbing a mountain. As the circle of Snow Island
recedes below you, an entire new landmass suddenly appears above you! The gondola carries you to the surface of the new island and lurches into the
station.
As you exit the gondola, the first thing you notice is that the air here is much warmer than it was on Snow Island. It's also quite humid. Is this where
the water source is?
The next thing you notice is an Elf sitting on the floor across the station in what seems to be a pile of colorful square cards.
"Oh! Hello!" The Elf excitedly runs over to you. "How may I be of service?" You ask about water sources.
"I'm not sure; I just operate the gondola lift. That does sound like something we'd have, though - this is Island Island, after all! I bet the gardener
would know. He's on a different island, though - er, the small kind surrounded by water, not the floating kind. We really need to come up with a better
naming scheme. Tell you what: if you can help me with something quick, I'll let you borrow my boat and you can go visit the gardener. I got all these
scratchcards as a gift, but I can't figure out what I've won."
The Elf leads you over to the pile of colorful cards. There, you discover dozens of scratchcards, all with their opaque covering already scratched off.
Picking one up, it looks like each card has two lists of numbers separated by a vertical bar (|): a list of winning numbers and then a list of numbers
you have. You organize the information into a table (your puzzle input).
As far as the Elf has been able to figure out, you have to figure out which of the numbers you have appear in the list of winning numbers. The first
match makes the card worth one point and each match after the first doubles the point value of that card.
For example:
Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
In the above example, card 1 has five winning numbers (41, 48, 83, 86, and 17) and eight numbers you have (83, 86, 6, 31, 17, 9, 48, and 53). Of the
numbers you have, four of them (48, 83, 17, and 86) are winning numbers! That means card 1 is worth 8 points (1 for the first match, then doubled three
times for each of the three matches after the first).
• Card 2 has two winning numbers (32 and 61), so it is worth 2 points.
• Card 3 has two winning numbers (1 and 21), so it is worth 2 points.
• Card 4 has one winning number (84), so it is worth 1 point.
• Card 5 has no winning numbers, so it is worth no points.
• Card 6 has no winning numbers, so it is worth no points.
So, in this example, the Elf's pile of scratchcards is worth 13 points.
Take a seat in the large pile of colorful cards. How many points are they worth in total?
Your puzzle answer was 21158.
--- Part Two ---
Just as you're about to report your findings to the Elf, one of you realizes that the rules have actually been printed on the back of every card this
whole time.
There's no such thing as "points". Instead, scratchcards only cause you to win more scratchcards equal to the number of winning numbers you have.
Specifically, you win copies of the scratchcards below the winning card equal to the number of matches. So, if card 10 were to have 5 matching numbers,
you would win one copy each of cards 11, 12, 13, 14, and 15.
Copies of scratchcards are scored like normal scratchcards and have the same card number as the card they copied. So, if you win a copy of card 10 and
it has 5 matching numbers, it would then win a copy of the same cards that the original card 10 won: cards 11, 12, 13, 14, and 15. This process repeats
until none of the copies cause you to win any more cards. (Cards will never make you copy a card past the end of the table.)
This time, the above example goes differently:
Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
• Card 1 has four matching numbers, so you win one copy each of the next four cards: cards 2, 3, 4, and 5.
• Your original card 2 has two matching numbers, so you win one copy each of cards 3 and 4.
• Your copy of card 2 also wins one copy each of cards 3 and 4.
• Your four instances of card 3 (one original and three copies) have two matching numbers, so you win four copies each of cards 4 and 5.
• Your eight instances of card 4 (one original and seven copies) have one matching number, so you win eight copies of card 5.
• Your fourteen instances of card 5 (one original and thirteen copies) have no matching numbers and win no more cards.
• Your one instance of card 6 (one original) has no matching numbers and wins no more cards.
Once all of the originals and copies have been processed, you end up with 1 instance of card 1, 2 instances of card 2, 4 instances of card 3, 8
instances of card 4, 14 instances of card 5, and 1 instance of card 6. In total, this example pile of scratchcards causes you to ultimately have 30
scratchcards!
Process all of the original and copied scratchcards until no more scratchcards are won. Including the original set of scratchcards, how many total
scratchcards do you end up with?
Your puzzle answer was 6050769.
Both parts of this puzzle are complete! They provide two gold stars: **
At this point, you should return to your Advent calendar and try another puzzle.
If you still want to see it, you can get your puzzle input.
You can also [Shareon Twitter Mastodon] this puzzle.
References
Visible links
. https://adventofcode.com/
. https://adventofcode.com/2023/about
. https://adventofcode.com/2023/events
. https://teespring.com/stores/advent-of-code
. https://adventofcode.com/2023/settings
. https://adventofcode.com/2023/auth/logout
. Advent of Code Supporter
https://adventofcode.com/2023/support
. https://adventofcode.com/2023
. https://adventofcode.com/2023
. https://adventofcode.com/2023/support
. https://adventofcode.com/2023/sponsors
. https://adventofcode.com/2023/leaderboard
. https://adventofcode.com/2023/stats
. https://adventofcode.com/2023/sponsors
. https://en.wikipedia.org/wiki/Scratchcard
. https://adventofcode.com/2023
. https://adventofcode.com/2023/day/4/input

6
2023/day04/testinput Normal file
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@ -0,0 +1,6 @@
Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11

11
helpers/helpers.go
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@ -153,11 +153,18 @@ func Atof(i string) float64 {
return ret
}
// Atoi is basically redundant
// Atoi goes through i and removes and characters that aren't numeric
// Then runs it through the normal Atoi
func Atoi(i string) int {
var wrk string
for _, bt := range i {
if bt >= '0' && bt <= '9' {
wrk = fmt.Sprintf("%s%s", wrk, string(bt))
}
}
var ret int
var err error
if ret, err = strconv.Atoi(i); err != nil {
if ret, err = strconv.Atoi(wrk); err != nil {
log.Fatalf("Invalid Atoi: %s\n%v", i, err)
}
return ret