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day4: problem 1 solution

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Keenan Tims 2023-12-05 19:13:55 -08:00
parent b1e7d7ad35
commit 0d330c0a39
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118
4/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "aho-corasick"
version = "1.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
dependencies = [
"memchr",
]
[[package]]
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version = "0.1.0"
dependencies = [
"lazy-regex",
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"syn",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"memchr",
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[[package]]
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version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[package]
name = "day4"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
lazy-regex = "3.1.0"

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Card 158: 31 58 68 7 24 18 30 32 19 92 | 57 2 92 33 60 84 76 51 79 31 42 99 81 3 88 17 47 67 48 13 6 28 20 23 56
Card 159: 13 42 26 92 53 33 44 45 19 90 | 59 95 2 51 25 81 17 30 3 71 36 22 58 90 33 52 8 92 37 6 11 19 45 96 88
Card 160: 94 76 70 63 43 53 59 19 20 64 | 5 68 35 74 79 19 62 40 33 11 63 69 60 24 1 85 96 55 91 70 10 12 71 50 42
Card 161: 34 29 98 99 81 52 96 77 57 39 | 78 96 67 3 5 20 85 10 58 79 45 62 46 92 15 97 88 2 57 40 81 74 69 61 32
Card 162: 38 24 86 51 80 1 16 83 58 34 | 77 58 45 18 80 39 31 23 11 13 46 28 65 62 60 33 20 6 10 99 37 35 40 91 64
Card 163: 14 97 5 33 34 96 50 47 55 74 | 6 66 77 79 37 45 39 82 90 9 50 38 14 31 19 13 29 15 89 30 17 88 12 44 53
Card 164: 56 31 76 6 69 27 65 74 39 49 | 4 89 2 75 20 12 53 73 14 40 86 24 82 11 88 90 57 22 35 54 30 64 15 32 41
Card 165: 62 75 48 65 43 85 8 80 45 91 | 84 74 86 98 57 38 69 78 28 22 7 19 83 60 3 55 23 34 94 13 2 58 90 11 39
Card 166: 17 21 56 71 10 84 50 83 25 61 | 39 83 68 27 43 4 15 10 21 25 54 7 17 29 14 28 56 64 24 58 33 62 44 22 48
Card 167: 24 89 68 2 90 36 25 82 38 59 | 28 24 83 43 46 7 56 2 38 89 6 61 59 31 50 68 32 25 36 9 88 19 82 90 14
Card 168: 58 22 65 47 99 85 72 29 25 12 | 11 21 39 51 26 77 2 31 99 33 15 95 4 62 69 22 38 50 97 20 55 72 8 12 89
Card 169: 99 18 97 9 10 76 72 75 26 87 | 44 94 63 21 54 96 19 8 50 9 86 16 49 41 60 5 57 7 38 27 95 12 40 85 1
Card 170: 43 35 76 13 27 60 70 54 23 83 | 46 56 59 54 62 70 76 29 23 83 13 27 68 15 11 7 60 4 28 43 61 33 35 47 99
Card 171: 27 58 57 48 76 97 1 86 25 40 | 36 32 61 74 82 31 38 79 33 34 46 2 27 89 50 10 22 55 72 91 39 64 43 98 42
Card 172: 12 13 84 55 27 67 10 78 11 16 | 24 9 11 96 12 60 46 6 76 31 85 49 53 8 64 74 65 15 18 90 82 67 16 57 73
Card 173: 60 84 36 23 82 27 14 54 74 9 | 9 37 31 62 91 14 74 13 39 38 23 87 1 84 80 92 30 54 32 60 36 48 61 82 27
Card 174: 25 21 34 45 32 86 99 42 72 98 | 95 34 91 32 25 86 98 21 80 75 84 70 7 99 72 45 17 40 79 63 1 19 61 42 87
Card 175: 83 24 18 84 45 38 23 42 56 14 | 14 76 98 92 46 44 97 20 13 64 72 96 16 68 57 21 6 34 3 19 55 89 9 83 1
Card 176: 25 71 31 38 3 55 96 76 6 69 | 63 66 19 98 27 87 96 8 54 31 67 46 53 33 28 12 99 88 80 17 13 71 93 14 1
Card 177: 38 25 67 43 18 3 16 72 57 51 | 79 52 12 72 23 56 77 80 31 42 18 99 83 60 24 33 64 32 75 85 9 90 43 8 1
Card 178: 39 62 57 1 11 79 8 99 56 52 | 20 81 94 41 95 1 39 82 5 97 7 68 24 64 99 98 67 53 9 86 33 43 17 46 88
Card 179: 19 63 34 49 71 38 94 17 1 33 | 86 35 94 70 38 10 33 99 54 2 39 11 92 91 34 43 67 18 12 15 95 1 23 20 49
Card 180: 45 81 55 44 80 73 7 25 31 59 | 83 93 49 20 72 29 92 35 91 89 52 70 27 75 48 33 21 41 46 74 56 4 6 87 36
Card 181: 42 34 76 85 33 27 66 79 58 73 | 80 71 26 6 41 39 68 36 15 19 13 33 34 62 82 88 10 3 76 46 51 99 78 85 72
Card 182: 68 80 84 58 75 67 44 92 18 65 | 34 89 9 87 40 88 72 73 33 74 11 6 69 4 63 70 86 2 7 82 66 81 24 77 22
Card 183: 60 22 7 19 93 32 31 23 36 41 | 6 35 77 49 29 45 39 21 57 61 22 15 70 48 94 53 31 18 87 99 52 3 62 67 33
Card 184: 95 26 39 98 51 33 67 43 59 11 | 19 44 30 10 18 47 57 95 25 78 53 61 2 87 88 22 37 45 75 83 29 34 48 97 84
Card 185: 7 16 46 63 13 2 99 9 93 26 | 37 28 50 41 55 75 73 6 96 82 17 92 87 10 49 72 15 86 64 36 95 32 13 5 53
Card 186: 14 21 68 8 64 78 15 89 19 59 | 43 22 10 85 63 60 90 62 97 17 33 39 7 6 58 51 47 54 11 50 36 2 31 46 34

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use std::fs::File;
use std::io::{BufRead, BufReader, Lines};
use lazy_regex::{lazy_regex, Lazy, Regex};
// --- 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).
// BOILERPLATE
type InputIter = Lines<BufReader<File>>;
fn get_input() -> InputIter {
let f = File::open("input").unwrap();
let br = BufReader::new(f);
br.lines()
}
fn main() {
println!("Problem 1 solution: {}", problem1(get_input()));
println!("Problem 2 solution: {}", problem2(get_input()));
}
// PARSING
const CARD_REGEX: Lazy<Regex> = lazy_regex!(r"^Card\s+([0-9]+):(.+)\|(.+)$");
fn num_list(s: &str) -> Vec<u32> {
s.split_whitespace()
.map(|s_num| s_num.parse().unwrap())
.collect()
}
pub struct Card {
id: usize,
winning_numbers: Vec<u32>,
our_numbers: Vec<u32>,
}
impl Card {
fn score(&self) -> u64 {
let match_count = self
.winning_numbers
.iter()
.filter(|win| self.our_numbers.contains(win))
.count();
if match_count > 0 {
1 << (match_count - 1)
} else {
0
}
}
}
impl From<&str> for Card {
fn from(s: &str) -> Self {
let parts = CARD_REGEX.captures(s).unwrap();
Card {
id: parts.get(1).unwrap().as_str().parse().unwrap(),
winning_numbers: num_list(parts.get(2).unwrap().as_str()),
our_numbers: num_list(parts.get(3).unwrap().as_str()),
}
}
}
// PROBLEM 1 solution
// 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?
fn problem1(input: InputIter) -> u64 {
let cards: Vec<Card> = input
.map(|line| Card::from(line.unwrap().as_str()))
.collect();
cards.iter().map(|x| x.score()).sum()
}
// PROBLEM 2 solution
fn problem2(input: InputIter) -> u64 {
0
}