Completed day 19 part 1
Part 2 is failing the example and I have no idea why :(
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day19/Cargo.lock
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day19/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "anyhow"
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version = "1.0.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "68803225a7b13e47191bab76f2687382b60d259e8cf37f6e1893658b84bb9479"
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[[package]]
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name = "day19"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"maplit",
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]
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[[package]]
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name = "maplit"
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version = "1.0.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
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day19/Cargo.toml
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day19/Cargo.toml
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[package]
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name = "day19"
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version = "0.1.0"
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authors = ["Tyler Hallada <tyler@hallada.net>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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anyhow = "1.0.36"
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maplit = "1.0.2"
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613
day19/input/input.txt
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19: 33 53 | 123 7
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3: 33 82 | 123 45
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92: 47 123 | 91 33
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34: 123 60 | 33 63
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91: 123 9 | 33 7
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20: 33 46 | 123 79
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101: 33 27 | 123 56
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47: 52 33 | 84 123
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115: 116 33 | 7 123
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41: 57 33 | 127 123
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33: "a"
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109: 123 89 | 33 33
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106: 33 72 | 123 6
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8: 42
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75: 123 22 | 33 100
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21: 76 123 | 28 33
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102: 95 33 | 81 123
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54: 33 44 | 123 2
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77: 123 13 | 33 116
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1: 33 26 | 123 34
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83: 123 90 | 33 66
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11: 42 31
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116: 89 89
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32: 116 33 | 53 123
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72: 9 123 | 111 33
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70: 33 9
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80: 33 20 | 123 1
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53: 123 123
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100: 123 67 | 33 121
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27: 88 33 | 9 123
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0: 8 11
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baababaaabbbaaaaabbbabab
|
||||||
|
ababbbabaaaabaaaaabaabbabbbababaaaaababbbaaababbabaabbbb
|
||||||
|
aabbbabbaaababaaabbbbaaa
|
||||||
|
aaaaaabbaaababbabbbbbaaa
|
||||||
|
aabbaaaabaaaaaabbbaabbba
|
||||||
|
abaabbbabbbaabbbbbabbaab
|
||||||
|
bbabababbaabbaaaabaabbbb
|
||||||
|
ababaabbaaaaaaaaababaabbabbbaabbbababbbbbbabaaaa
|
||||||
|
aaabababaaaabbbaaabbbbaaababbbbabbaabababaaaaabb
|
||||||
|
aaabbbabaaaaaabbbaabbbbb
|
||||||
|
baaabbbababbabaaaabbbbba
|
||||||
|
baaabbbabbabbabbbbbabaabababababbabbbbbaabbaaaba
|
||||||
|
aaaabaaaaababbababbabaab
|
||||||
|
baaaaaabbbbabaaabaababaaabbabaabaaabaabb
|
||||||
|
bbabbbababbbaaaabbbbbabb
|
||||||
|
aaababaabaaaaaababbbabaa
|
||||||
|
bababaaaaabababbbaabbbaa
|
||||||
|
aababaaababaaabbaabbbbab
|
||||||
|
abaababaaaaabbbbabbbbbaa
|
||||||
|
babaababaababbababbbbaaa
|
||||||
|
ababbbabbaaaabaababbbbabbaaaabbababaabaabbbbaaabbbbbabba
|
||||||
|
aabbaabaababaabbaaababaaaaaaaabbaaaaabbbabbabaab
|
||||||
12
day19/input/test1.txt
Normal file
12
day19/input/test1.txt
Normal file
@ -0,0 +1,12 @@
|
|||||||
|
0: 4 1 5
|
||||||
|
1: 2 3 | 3 2
|
||||||
|
2: 4 4 | 5 5
|
||||||
|
3: 4 5 | 5 4
|
||||||
|
4: "a"
|
||||||
|
5: "b"
|
||||||
|
|
||||||
|
ababbb
|
||||||
|
bababa
|
||||||
|
abbbab
|
||||||
|
aaabbb
|
||||||
|
aaaabbb
|
||||||
47
day19/input/test2.txt
Normal file
47
day19/input/test2.txt
Normal file
@ -0,0 +1,47 @@
|
|||||||
|
42: 9 14 | 10 1
|
||||||
|
9: 14 27 | 1 26
|
||||||
|
10: 23 14 | 28 1
|
||||||
|
1: "a"
|
||||||
|
11: 42 31
|
||||||
|
5: 1 14 | 15 1
|
||||||
|
19: 14 1 | 14 14
|
||||||
|
12: 24 14 | 19 1
|
||||||
|
16: 15 1 | 14 14
|
||||||
|
31: 14 17 | 1 13
|
||||||
|
6: 14 14 | 1 14
|
||||||
|
2: 1 24 | 14 4
|
||||||
|
0: 8 11
|
||||||
|
13: 14 3 | 1 12
|
||||||
|
15: 1 | 14
|
||||||
|
17: 14 2 | 1 7
|
||||||
|
23: 25 1 | 22 14
|
||||||
|
28: 16 1
|
||||||
|
4: 1 1
|
||||||
|
20: 14 14 | 1 15
|
||||||
|
3: 5 14 | 16 1
|
||||||
|
27: 1 6 | 14 18
|
||||||
|
14: "b"
|
||||||
|
21: 14 1 | 1 14
|
||||||
|
25: 1 1 | 1 14
|
||||||
|
22: 14 14
|
||||||
|
8: 42
|
||||||
|
26: 14 22 | 1 20
|
||||||
|
18: 15 15
|
||||||
|
7: 14 5 | 1 21
|
||||||
|
24: 14 1
|
||||||
|
|
||||||
|
abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa
|
||||||
|
bbabbbbaabaabba
|
||||||
|
babbbbaabbbbbabbbbbbaabaaabaaa
|
||||||
|
aaabbbbbbaaaabaababaabababbabaaabbababababaaa
|
||||||
|
bbbbbbbaaaabbbbaaabbabaaa
|
||||||
|
bbbababbbbaaaaaaaabbababaaababaabab
|
||||||
|
ababaaaaaabaaab
|
||||||
|
ababaaaaabbbaba
|
||||||
|
baabbaaaabbaaaababbaababb
|
||||||
|
abbbbabbbbaaaababbbbbbaaaababb
|
||||||
|
aaaaabbaabaaaaababaa
|
||||||
|
aaaabbaaaabbaaa
|
||||||
|
aaaabbaabbaaaaaaabbbabbbaaabbaabaaa
|
||||||
|
babaaabbbaaabaababbaabababaaab
|
||||||
|
aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba
|
||||||
15
day19/input/test3.txt
Normal file
15
day19/input/test3.txt
Normal file
@ -0,0 +1,15 @@
|
|||||||
|
0: 1 | 2
|
||||||
|
1: 3 | 3 1
|
||||||
|
2: 3 4 | 3 2 4
|
||||||
|
3: "a"
|
||||||
|
4: "b"
|
||||||
|
|
||||||
|
a
|
||||||
|
aa
|
||||||
|
aaa
|
||||||
|
b
|
||||||
|
ab
|
||||||
|
aabb
|
||||||
|
aaabbb
|
||||||
|
aaaabbb
|
||||||
|
aaabbbb
|
||||||
220
day19/src/main.rs
Normal file
220
day19/src/main.rs
Normal file
@ -0,0 +1,220 @@
|
|||||||
|
use anyhow::{Context, Error, Result};
|
||||||
|
use std::collections::HashMap;
|
||||||
|
use std::fs::File;
|
||||||
|
use std::io::{BufRead, BufReader};
|
||||||
|
use std::str::FromStr;
|
||||||
|
use std::time::Instant;
|
||||||
|
|
||||||
|
const INPUT: &str = "input/input.txt";
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq, Eq)]
|
||||||
|
enum Rule {
|
||||||
|
Char(char),
|
||||||
|
Seq(Vec<usize>),
|
||||||
|
Or((Vec<usize>, Vec<usize>)),
|
||||||
|
}
|
||||||
|
|
||||||
|
impl FromStr for Rule {
|
||||||
|
type Err = Error;
|
||||||
|
|
||||||
|
fn from_str(s: &str) -> Result<Self> {
|
||||||
|
if s.contains("|") {
|
||||||
|
let mut rule = s.split(" | ");
|
||||||
|
let left = rule.next().context("Failed to parse OR rule left side")?;
|
||||||
|
let left = left
|
||||||
|
.split(" ")
|
||||||
|
.map(|num| Ok(num.parse()?))
|
||||||
|
.collect::<Result<Vec<usize>>>()?;
|
||||||
|
let right = rule.next().context("Failed to parse OR rule right side")?;
|
||||||
|
let right = right
|
||||||
|
.split(" ")
|
||||||
|
.map(|num| Ok(num.parse()?))
|
||||||
|
.collect::<Result<Vec<usize>>>()?;
|
||||||
|
Ok(Rule::Or((left, right)))
|
||||||
|
} else if s.contains("\"") {
|
||||||
|
let c = s
|
||||||
|
.chars()
|
||||||
|
.skip(1)
|
||||||
|
.next()
|
||||||
|
.context("Failed to parse rule char")?;
|
||||||
|
Ok(Rule::Char(c))
|
||||||
|
} else {
|
||||||
|
let nums = s
|
||||||
|
.split(" ")
|
||||||
|
.map(|num| Ok(num.parse()?))
|
||||||
|
.collect::<Result<Vec<usize>>>()?;
|
||||||
|
Ok(Rule::Seq(nums))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn parse_indexed_rule(s: &str) -> Result<(usize, Rule)> {
|
||||||
|
let mut rule = s.split(": ");
|
||||||
|
let index = rule.next().context("Failed to parse rule index")?.parse()?;
|
||||||
|
let rule = rule.next().context("Failed to parse rule")?.parse()?;
|
||||||
|
Ok((index, rule))
|
||||||
|
}
|
||||||
|
|
||||||
|
fn string_matches_rule<'a>(
|
||||||
|
s: &'a str,
|
||||||
|
rules: &HashMap<usize, Rule>,
|
||||||
|
rule: &Rule,
|
||||||
|
ends: bool,
|
||||||
|
) -> (&'a str, bool) {
|
||||||
|
if s.is_empty() {
|
||||||
|
return (s, false);
|
||||||
|
}
|
||||||
|
match rule {
|
||||||
|
Rule::Char(c) => {
|
||||||
|
if s.len() < 1 {
|
||||||
|
(s, false)
|
||||||
|
} else if s.chars().next().expect("non-empty string") == *c {
|
||||||
|
let rest = &s[1..];
|
||||||
|
if !ends || (ends && rest.is_empty()) {
|
||||||
|
(rest, true)
|
||||||
|
} else {
|
||||||
|
(rest, false)
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
(s, false)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Rule::Seq(seq) => {
|
||||||
|
let mut rest = s;
|
||||||
|
for (i, rule_index) in seq.iter().enumerate() {
|
||||||
|
let result = string_matches_rule(
|
||||||
|
rest,
|
||||||
|
rules,
|
||||||
|
&rules[rule_index],
|
||||||
|
if i == seq.len() - 1 { ends } else { false },
|
||||||
|
);
|
||||||
|
if !result.1 {
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
rest = result.0;
|
||||||
|
}
|
||||||
|
(rest, true)
|
||||||
|
}
|
||||||
|
Rule::Or((left, right)) => {
|
||||||
|
let result = string_matches_rule(s, rules, &Rule::Seq(left.to_vec()), ends);
|
||||||
|
if result.1 {
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
let result = string_matches_rule(s, rules, &Rule::Seq(right.to_vec()), ends);
|
||||||
|
result
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn solve_part1(input_path: &str) -> Result<usize> {
|
||||||
|
let file = File::open(input_path)?;
|
||||||
|
let reader = BufReader::new(file);
|
||||||
|
let mut lines = reader.lines();
|
||||||
|
let mut rules: HashMap<usize, Rule> = HashMap::new();
|
||||||
|
loop {
|
||||||
|
let line = lines.next().context("Unexpected end of input")??;
|
||||||
|
if line.is_empty() {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
let (index, rule) = parse_indexed_rule(&line)?;
|
||||||
|
rules.insert(index, rule);
|
||||||
|
}
|
||||||
|
|
||||||
|
let strings: Vec<String> =
|
||||||
|
lines.collect::<std::result::Result<Vec<String>, std::io::Error>>()?;
|
||||||
|
|
||||||
|
Ok(strings
|
||||||
|
.iter()
|
||||||
|
.filter(|s| {
|
||||||
|
let result = string_matches_rule(&s, &rules, &rules[&0], true);
|
||||||
|
result.1 && result.0.is_empty()
|
||||||
|
})
|
||||||
|
.count())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn solve_part2(input_path: &str) -> Result<usize> {
|
||||||
|
let file = File::open(input_path)?;
|
||||||
|
let reader = BufReader::new(file);
|
||||||
|
let mut lines = reader.lines();
|
||||||
|
let mut rules: HashMap<usize, Rule> = HashMap::new();
|
||||||
|
loop {
|
||||||
|
let line = lines.next().context("Unexpected end of input")??;
|
||||||
|
if line.is_empty() {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
let (index, rule) = parse_indexed_rule(&line)?;
|
||||||
|
let rule = if index == 8 {
|
||||||
|
Rule::Or((vec![42], vec![42, 8]))
|
||||||
|
} else if index == 11 {
|
||||||
|
Rule::Or((vec![42, 31], vec![42, 11, 31]))
|
||||||
|
} else {
|
||||||
|
rule
|
||||||
|
};
|
||||||
|
rules.insert(index, rule);
|
||||||
|
}
|
||||||
|
|
||||||
|
let strings: Vec<String> =
|
||||||
|
lines.collect::<std::result::Result<Vec<String>, std::io::Error>>()?;
|
||||||
|
Ok(strings
|
||||||
|
.into_iter()
|
||||||
|
.filter(|s| {
|
||||||
|
let result = string_matches_rule(&s, &rules, &rules[&0], true);
|
||||||
|
result.1 && result.0.is_empty()
|
||||||
|
})
|
||||||
|
.count())
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let mut now = Instant::now();
|
||||||
|
println!("Part 1: {}", solve_part1(INPUT).unwrap());
|
||||||
|
println!("(elapsed: {:?})", now.elapsed());
|
||||||
|
now = Instant::now();
|
||||||
|
println!("");
|
||||||
|
println!("Part 2: {}", solve_part2(INPUT).unwrap());
|
||||||
|
println!("(elapsed: {:?})", now.elapsed());
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
use maplit::hashmap;
|
||||||
|
|
||||||
|
const TEST_INPUT1: &str = "input/test1.txt";
|
||||||
|
const TEST_INPUT2: &str = "input/test2.txt";
|
||||||
|
const TEST_INPUT3: &str = "input/test3.txt";
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn parses_input() {
|
||||||
|
let file = File::open(TEST_INPUT1).unwrap();
|
||||||
|
let reader = BufReader::new(file);
|
||||||
|
let rules: HashMap<usize, Rule> = reader
|
||||||
|
.lines()
|
||||||
|
.take_while(|line| !line.as_ref().map_or(true, |line| line.is_empty()))
|
||||||
|
.map(|line| parse_indexed_rule(&line.unwrap()).unwrap())
|
||||||
|
.collect();
|
||||||
|
|
||||||
|
assert_eq!(
|
||||||
|
rules,
|
||||||
|
hashmap! {
|
||||||
|
0 => Rule::Seq(vec![4, 1, 5]),
|
||||||
|
1 => Rule::Or((vec![2, 3], vec![3, 2])),
|
||||||
|
2 => Rule::Or((vec![4, 4], vec![5, 5])),
|
||||||
|
3 => Rule::Or((vec![4, 5], vec![5, 4])),
|
||||||
|
4 => Rule::Char('a'),
|
||||||
|
5 => Rule::Char('b'),
|
||||||
|
}
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn solves_part1() {
|
||||||
|
assert_eq!(solve_part1(TEST_INPUT1).unwrap(), 2);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn solves_part2() {
|
||||||
|
assert_eq!(solve_part1(TEST_INPUT2).unwrap(), 3);
|
||||||
|
assert_eq!(solve_part1(TEST_INPUT3).unwrap(), 6);
|
||||||
|
assert_eq!(solve_part2(TEST_INPUT2).unwrap(), 12);
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user