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144
day-16/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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13
day-16/Cargo.toml Normal file
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@ -0,0 +1,13 @@
[package]
name = "day-16"
version = "0.1.0"
authors = ["Tristan Daniël Maat <tm@tlater.net>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
indoc = "0.3"
itertools = "0.9"
lazy_static = "1.4"
regex = "1.4"

270
day-16/input Normal file
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537,804,891,527,302,277,369,885,550,272,769,147,275,350,315,297,653,327,109,255
626,64,337,452,737,435,650,539,277,351,352,744,933,178,651,314,768,401,605,199
378,395,278,889,689,306,720,467,93,369,328,599,461,150,530,68,261,454,184,943
721,578,742,860,454,801,59,524,295,587,438,626,602,547,70,686,554,122,527,209
588,146,385,538,298,270,546,353,975,911,144,479,77,475,51,767,767,528,527,165
581,14,389,609,434,666,380,432,146,496,158,319,80,254,295,900,164,219,520,885
655,710,305,894,202,495,832,469,435,613,149,261,166,832,815,901,873,79,944,377
806,670,592,699,645,161,144,161,466,307,78,687,534,157,57,543,457,911,539,934
720,378,859,726,825,718,595,888,605,146,365,743,594,457,433,535,503,694,210,819
360,465,605,595,829,345,807,597,173,280,69,485,168,831,180,175,150,476,437,198
498,246,194,801,183,539,690,613,265,146,854,540,142,892,945,279,501,377,303,266
701,656,351,137,345,128,819,374,713,540,819,775,614,603,824,743,64,582,687,197
804,54,54,432,156,764,760,602,424,773,824,399,689,153,891,458,626,665,887,907
892,606,504,359,158,260,392,467,163,276,389,332,208,549,378,719,322,538,908,397
142,859,630,255,906,74,73,462,695,692,368,295,829,657,538,316,901,457,310,253
86,685,357,390,372,549,370,379,550,864,539,933,203,54,273,605,329,171,486,155
249,289,597,167,703,187,357,763,745,690,189,389,377,393,313,609,607,603,340,223
995,693,420,497,57,134,811,252,686,776,495,318,314,341,394,79,314,668,468,177
462,802,5,270,805,805,552,595,340,819,682,827,215,939,652,656,704,910,524,348
552,690,853,266,324,655,378,165,179,391,598,149,355,418,549,669,896,482,777,899
650,500,521,825,203,594,529,51,540,367,181,900,162,846,178,553,341,830,399,703
700,654,348,661,772,729,812,481,368,370,467,547,432,484,504,737,249,161,165,500
473,356,357,763,51,525,571,418,162,438,682,252,343,822,308,461,53,170,386,333
817,741,340,903,386,699,670,933,265,712,303,377,705,311,702,186,392,987,904,609
375,910,352,887,746,769,656,668,888,605,484,433,523,854,554,547,80,250,570,477
717,384,459,586,265,434,433,74,136,434,817,168,2,581,258,60,220,909,156,78
815,713,97,668,498,323,397,169,122,897,602,299,736,897,182,906,811,907,767,221
304,295,596,988,587,70,817,138,478,764,942,66,896,253,257,832,370,471,909,163
324,698,764,184,153,152,462,186,424,855,614,185,381,238,344,855,609,891,193,472
693,457,531,3,220,182,366,669,207,302,707,687,798,887,695,609,55,267,538,303
711,473,468,321,439,549,655,456,475,71,612,721,23,191,374,541,665,156,350,328
422,363,266,300,892,889,272,741,864,65,250,60,591,856,664,537,375,457,455,905
207,161,890,542,64,154,203,496,80,864,157,294,536,298,462,175,321,521,199,803
693,523,472,538,523,201,430,172,220,371,80,548,105,933,946,943,686,343,739,652
682,803,520,816,313,523,827,300,547,807,613,857,350,391,611,863,361,596,181,909
625,266,799,547,68,911,174,192,122,694,599,379,277,390,463,53,341,209,488,317
905,331,934,712,281,946,435,186,169,806,499,859,724,398,737,885,693,433,693,158
476,771,334,802,581,934,731,719,387,669,662,668,938,255,532,706,57,811,773,203
53,459,202,913,476,588,287,700,181,69,182,768,498,350,472,147,664,340,605,798
382,174,338,373,554,536,75,906,328,397,342,765,984,801,139,345,692,692,281,366
428,894,308,623,145,542,358,170,821,257,535,582,214,120,710,593,171,221,583,369
54,767,151,756,458,380,271,260,803,197,427,262,905,803,773,78,533,462,537,899
67,881,298,207,210,320,321,597,261,829,745,770,534,153,815,223,372,611,488,161
134,346,715,470,439,633,318,554,454,800,336,524,807,469,52,525,58,896,140,496
316,356,366,896,660,252,736,135,169,458,653,533,268,299,999,374,194,134,375,191
467,939,168,385,359,774,342,383,547,389,251,461,718,64,867,171,821,171,483,606
720,386,186,379,258,716,345,737,768,723,478,584,156,333,821,283,934,138,419,597
531,160,169,889,608,207,822,459,892,858,431,327,393,656,653,601,534,706,163,1
194,501,60,223,321,165,718,464,823,775,500,554,711,269,442,499,814,798,379,77
613,540,191,746,702,551,179,932,323,605,808,867,346,743,532,214,92,932,892,397
715,377,503,713,906,541,249,424,120,439,392,395,361,719,867,399,863,463,932,718
183,816,650,170,862,393,466,869,665,718,818,299,579,538,530,401,438,743,594,366
59,126,354,806,208,196,77,719,61,162,604,470,260,504,275,901,320,215,549,467
460,311,185,169,466,553,150,997,342,418,583,50,344,537,495,693,382,598,318,146
689,725,373,553,191,175,885,353,207,822,775,530,703,774,390,353,171,585,556,333
250,591,337,820,335,338,504,69,668,905,657,375,705,9,256,738,169,196,808,803
674,154,468,382,716,435,397,462,935,739,531,399,477,526,268,598,657,261,611,295
726,888,173,64,203,154,179,595,312,936,188,380,207,772,308,273,712,464,894,202
59,553,685,298,741,597,312,273,596,688,428,321,167,363,267,890,74,165,706,138
117,121,538,372,135,270,140,712,296,495,249,56,190,65,949,369,773,276,435,265
540,813,931,83,59,268,701,936,342,323,713,743,312,327,827,896,266,261,590,69
893,337,165,874,199,719,342,386,328,485,612,533,281,76,861,652,900,821,393,611
436,51,742,259,661,188,437,606,737,175,9,769,399,343,742,585,337,775,268,61
66,306,205,705,660,550,388,473,198,931,436,801,830,294,706,433,944,185,169,908
870,831,151,892,654,690,255,543,162,167,168,221,355,96,178,829,539,653,314,142
310,75,267,824,693,209,458,714,14,176,71,420,393,214,169,79,686,200,424,265
588,259,219,315,550,374,741,436,714,368,353,191,537,658,127,549,522,329,460,718
688,807,828,475,215,804,332,51,473,889,273,581,483,599,183,276,291,935,341,262
71,525,597,893,828,545,708,307,367,303,325,251,686,586,197,608,391,821,355,2
23,905,719,495,166,715,774,554,810,737,217,948,198,135,278,691,267,458,421,711
420,806,207,192,353,352,711,868,464,277,811,168,713,320,984,326,300,354,583,700
314,329,626,344,550,424,611,743,520,855,462,771,369,719,682,476,557,381,208,149
379,58,80,809,391,540,270,296,365,269,527,380,937,489,337,581,498,668,258,401
983,427,808,278,859,152,667,213,775,320,357,697,305,685,799,522,553,530,594,183
690,913,853,600,197,804,874,190,427,860,830,741,400,501,822,943,553,376,941,696
811,150,314,312,823,531,704,693,700,942,264,164,695,938,497,860,500,856,258,642
209,253,815,431,601,382,277,375,167,810,591,318,906,178,611,203,417,886,526,698
536,541,436,813,600,593,939,763,175,210,945,384,295,739,151,201,431,582,129,715
464,709,463,317,663,472,547,715,563,458,606,771,605,626,186,859,866,304,253,821
63,79,423,188,819,616,553,774,588,142,279,477,343,68,180,155,252,736,302,905
333,701,815,398,824,336,305,690,467,142,202,378,127,140,820,481,607,661,312,533
596,211,554,742,595,906,273,340,829,272,855,770,912,311,814,76,748,348,370,259
219,906,363,803,350,350,769,525,280,430,767,398,332,155,358,556,864,531,266,535
823,692,712,905,212,865,603,555,383,610,162,145,722,792,600,381,168,869,471,433
891,589,177,194,429,338,344,372,162,436,477,821,388,259,369,864,695,64,691,997
744,486,284,530,372,603,765,169,305,432,454,204,344,212,181,693,892,707,948,172
521,266,317,860,487,250,275,122,888,61,430,327,636,593,477,858,461,476,865,464
462,537,894,889,700,763,171,482,298,223,822,931,155,498,159,891,897,319,361,265
520,768,531,935,476,595,668,77,710,855,183,805,659,939,721,359,270,332,391,171
326,717,399,474,297,706,431,522,598,799,533,706,894,817,289,935,669,482,597,394
197,496,686,545,349,716,167,55,866,931,477,310,716,427,168,73,892,282,553,864
887,223,159,655,458,889,607,331,175,464,495,143,540,865,54,811,370,67,680,398
170,343,418,466,549,373,80,78,695,310,302,594,375,731,168,814,146,460,704,71
419,888,352,338,898,478,820,589,948,421,667,307,607,174,933,819,599,595,700,12
605,463,353,821,539,862,594,596,327,556,152,372,894,309,435,11,581,801,432,159
313,389,774,272,908,811,890,822,815,709,270,422,145,660,460,167,128,251,317,899
667,316,458,259,67,400,168,60,705,5,696,688,193,355,431,137,814,219,477,470
343,0,59,592,771,813,502,654,682,720,338,55,933,422,376,457,741,694,174,151
598,714,253,606,854,399,357,668,148,471,270,194,378,702,213,79,532,799,634,810
936,366,53,775,861,329,691,765,397,626,861,164,190,531,690,354,310,322,753,596
279,343,157,416,654,381,768,551,427,737,64,609,742,503,421,457,252,317,827,497
547,222,212,163,691,179,346,813,617,723,936,487,868,768,938,819,581,396,172,221
932,773,214,742,370,717,63,61,300,737,719,869,480,278,460,718,224,823,590,600
398,485,350,222,739,198,211,472,590,984,139,354,615,664,144,591,742,931,590,395
419,865,800,355,805,613,668,596,545,469,197,654,659,452,389,340,262,185,486,433
814,160,70,217,768,176,938,582,53,374,587,552,651,936,592,439,912,995,484,369
545,386,713,594,500,54,268,610,220,354,810,275,548,374,454,198,524,593,877,897
371,680,176,818,433,66,801,340,527,302,187,655,664,302,454,534,887,909,911,313
203,189,687,683,50,53,300,263,99,336,399,166,540,480,717,329,890,704,691,318
701,254,400,218,78,398,613,931,58,531,148,651,481,15,703,425,524,154,534,554
822,192,207,222,830,295,894,187,599,135,798,933,894,253,822,423,383,170,438,288
772,188,73,486,129,78,897,595,426,486,481,772,652,266,548,187,892,692,534,256

224
day-16/src/main.rs Normal file
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@ -0,0 +1,224 @@
use std::collections::HashMap;
use std::fs;
use std::ops::RangeInclusive;
use itertools::Itertools;
use lazy_static::lazy_static;
use regex::Regex;
type Rules = HashMap<String, (RangeInclusive<u32>, RangeInclusive<u32>)>;
type Ticket = Vec<u32>;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input = fs::read_to_string("input")?;
let (rules, own_ticket, tickets) = parse_tickets(&input)?;
// Part 1
let invalid = get_invalid_values(&rules, &tickets);
println!("{}", invalid.iter().sum::<u32>());
// Part 2
let valid = get_valid_tickets(&rules, &tickets);
let order = get_value_order(&rules, &valid);
let result: u32 = order
.iter()
.zip(own_ticket)
.filter_map(|(name, value)| {
if name.starts_with("departure") {
Some(value)
} else {
None
}
})
.product();
println!("{}", result);
Ok(())
}
fn parse_tickets(input: &str) -> Result<(Rules, Ticket, Vec<Ticket>), String> {
let blocks: Vec<&str> = input.split("\n\n").collect();
let parse_u32 = |val: &str| {
val.parse::<u32>()
.map_err(|e| format!("Invalid number: {}", e))
};
if blocks.len() < 3 {
Err("Input incomplete")?;
}
let rules = blocks[0]
.lines()
.map(|line| {
lazy_static! {
static ref RULE_RE: Regex =
Regex::new(r"([[:alpha:]]+?): (\d+)-(\d+) or (\d+)-(\d+)")
.expect("Regex should compile");
}
let caps = RULE_RE
.captures(line)
.ok_or(format!("Invalid rule line: {}", line))?;
let name = caps[1].to_string();
let range1 = parse_u32(&caps[2])?..=parse_u32(&caps[3])?;
let range2 = parse_u32(&caps[4])?..=parse_u32(&caps[5])?;
Ok((name, (range1, range2)))
})
.collect::<Result<Rules, String>>()?;
let own_ticket = blocks[1]
.lines()
.skip(1)
.next()
.ok_or("Input incomplete")?
.split(',')
.map(|c| parse_u32(c))
.collect::<Result<Ticket, String>>()?;
let other_tickets = blocks[2]
.lines()
.skip(1)
.map(|line| line.split(',').map(|c| parse_u32(c)).collect())
.collect::<Result<Vec<Ticket>, String>>()?;
Ok((rules, own_ticket, other_tickets))
}
fn get_invalid_values(rules: &Rules, tickets: &Vec<Ticket>) -> Vec<u32> {
tickets
.iter()
.flat_map(|ticket| {
ticket.iter().filter(|value| {
!rules
.values()
.any(|(rule1, rule2)| rule1.contains(value) || rule2.contains(value))
})
})
.copied()
.collect()
}
fn get_valid_tickets(rules: &Rules, tickets: &Vec<Ticket>) -> Vec<Ticket> {
tickets
.iter()
.filter(|ticket| {
ticket.iter().all(|value| {
rules
.values()
.any(|(rule1, rule2)| rule1.contains(value) || rule2.contains(value))
})
})
.cloned()
.collect()
}
fn get_value_order(rules: &Rules, tickets: &Vec<Ticket>) -> Vec<String> {
let rules: Vec<(String, (RangeInclusive<u32>, RangeInclusive<u32>))> = rules
.iter()
.map(|tup| (tup.0.clone(), (tup.1 .0, tup.1 .1)))
.collect();
rules.sort_by(|name, (_, (rule1, rule2))| rule1.count() + rule2.count());
let mut next_ticket = 0;
let mut order: Vec<String> = rules.keys().cloned().collect();
let order_fits = |order: &Vec<String>, ticket: &Ticket| {
order.iter().zip(ticket).all(|(name, value)| {
let (rule1, rule2) = rules.get(name).expect("Must be there");
rule1.contains(value) || rule2.contains(value)
})
};
loop {
if order_fits(&order, &tickets[next_ticket]) {}
}
// rules
// .iter()
// .permutations(rules.len())
// .filter_map(|rules| {
// if tickets.iter().all(|ticket| {
// rules
// .iter()
// .zip(ticket)
// .all(|((_, (rule1, rule2)), value)| {
// rule1.contains(value) | rule2.contains(value)
// })
// }) {
// Some(
// rules
// .iter()
// .map(|rule| rule.0.clone())
// .collect::<Vec<String>>(),
// )
// } else {
// None
// }
// })
// .next()
// .expect("Must have a valid solution")
unimplemented!()
}
#[cfg(test)]
mod tests {
use super::*;
use indoc::indoc;
#[test]
fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
let input = indoc!(
"
class: 1-3 or 5-7
row: 6-11 or 33-44
seat: 13-40 or 45-50
your ticket:
7,1,14
nearby tickets:
7,3,47
40,4,50
55,2,20
38,6,12
"
);
let (rules, _, tickets) = parse_tickets(input)?;
let invalid = get_invalid_values(&rules, &tickets);
assert_eq!(invalid.iter().sum::<u32>(), 71);
Ok(())
}
#[test]
fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
let input = indoc!(
"
class: 0-1 or 4-19
row: 0-5 or 8-19
seat: 0-13 or 16-19
your ticket:
11,12,13
nearby tickets:
3,9,18
15,1,5
5,14,9
"
);
let (rules, _, tickets) = parse_tickets(input)?;
let valid = get_valid_tickets(&rules, &tickets);
let order = get_value_order(&rules, &valid);
assert_eq!(order, vec!["row", "class", "seat"]);
Ok(())
}
}