2020/19/1

2020/inputs/day19

@@ -0,0 +1,626 @@
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+100: 53 73 | 116 125
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+71: 116 58 | 53 78
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+53: "a"
+81: 73 53 | 33 116
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2020/src/bin/day19.rs

@@ -0,0 +1,172 @@
+#![feature(test, str_split_once, bool_to_option)]
+extern crate test;
+use aoc2020::common::*;
+use itertools::Itertools;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+enum Rule {
+    Char(u8),
+    And((usize, usize)),
+    AndOr((usize, usize), (usize, usize)),
+    Or((usize, usize)),
+    Useless(usize), // just delegates to another rule and makes parsing annoying
+    // This is why you don’t change the requirements once the implementation is done. REEEEEE
+    Special8(usize, (usize, usize)),
+    Special11((usize, usize), (usize, usize, usize)),
+    // If Rule was a recursive struct, this could have been defined as And(first, And(second, third)), but alas
+    Triple((usize, usize, usize)),
+}
+
+type Parsed<'a> = (RuleSet, &'a str);
+
+#[derive(Debug, Clone)]
+struct RuleSet(Vec<Rule>);
+
+impl RuleSet {
+    fn matches(&self, s: &str, rule: Rule) -> Option<usize> {
+        let res = match rule {
+            Rule::Char(c) => (s.as_bytes().first() == Some(&c)).then_some(1),
+            Rule::And((r1, r2)) => self
+                .matches(s, self.0[r1])
+                .and_then(|i| self.matches(&s[i..], self.0[r2]).map(|j| i + j)),
+            Rule::AndOr((r1, r2), (r3, r4)) => self
+                .matches(s, Rule::And((r1, r2)))
+                .or_else(|| self.matches(s, Rule::And((r3, r4)))),
+            Rule::Or((r1, r2)) => self.matches(s, Rule::Useless(r1)).or_else(|| self.matches(s, Rule::Useless(r2))),
+            Rule::Useless(r) => self.matches(s, self.0[r]),
+            // part 2 shit below:
+            Rule::Special8(first, second) => self.matches(s, Rule::Useless(first)).or_else(|| self.matches(s, Rule::And(second))),
+            Rule::Special11(first, second) => self.matches(s, Rule::And(first)).or_else(|| self.matches(s, Rule::Triple(second))),
+            Rule::Triple((r1, r2, r3)) => self
+                .matches(s, self.0[r1])
+                .and_then(|i| self.matches(&s[i..], self.0[r2]).map(|j| i + j))
+                .and_then(|i| self.matches(&s[i..], self.0[r3]).map(|j| i + j)),
+        };
+        res
+    }
+}
+
+fn read_input() -> String {
+    read_file(19)
+}
+
+fn parse_input<'a>(raw: &'a str) -> Parsed<'a> {
+    let (rules, inputs) = raw.split_once("\n\n").unwrap();
+    let rules = RuleSet(
+        rules
+            .lines()
+            .filter_map(|l| l.split_once(": "))
+            // why isn’t this already sorted like it was in the example?
+            .sorted_by_key(|t| t.0.parse::<i32>().unwrap())
+            .map(|(_, r)| match r {
+                or if or.contains('|') => {
+                    let mut split = or.split(' ').filter(|s| s != &"|").map(|s| s.parse().unwrap());
+                    split
+                        .clone()
+                        .next_tuple()
+                        .map(|(a, b, c, d)| Rule::AndOr((a, b), (c, d)))
+                        .or_else(|| split.next_tuple().map(|(a, b)| Rule::Or((a, b))))
+                        .unwrap()
+                }
+                chr if chr.contains('"') => Rule::Char(chr.bytes().skip_while(|&b| b != b'"').skip(1).next().unwrap()),
+                and if and.contains(' ') => Rule::And(and.split(' ').map(|s| s.parse().unwrap()).next_tuple().unwrap()),
+                useless => Rule::Useless(useless.parse().unwrap()),
+            })
+            .collect(),
+    );
+    (rules, inputs)
+}
+
+fn part1((rules, input): &Parsed) -> usize {
+    input.lines().filter(|l| rules.matches(l, rules.0[0]) == Some(l.len())).count()
+}
+
+fn part2(parsed: &Parsed) -> usize {
+    let mut rules = parsed.0.clone();
+    rules.0[8] = Rule::Special8(42, (42, 8));
+    rules.0[11] = Rule::Special11((42, 31), (42, 11, 31));
+    dbg!(parsed.1.lines().map(|l| (l, rules.matches(l, rules.0[0]))).collect_vec());
+    parsed.1.lines().filter(|l| rules.matches(l, rules.0[0]) == Some(l.len())).count()
+}
+
+fn main() {
+    let raw = read_input();
+    let input = parse_input(&raw);
+    println!("Part 1: {}", part1(&input));
+    // 265 too low, 395 too high. apparently 379? no idea how that’s supposed to work
+    println!("Part 2: {}", part2(&input));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use aoc2020::*;
+    use paste::paste;
+    use test::black_box;
+
+    const TEST_INPUT: &str = r#"0: 8 11
+1: "a"
+2: 1 24 | 14 4
+3: 5 14 | 16 1
+4: 1 1
+5: 1 14 | 15 1
+6: 14 14 | 1 14
+7: 14 5 | 1 21
+8: 42
+9: 14 27 | 1 26
+10: 23 14 | 28 1
+11: 42 31
+12: 24 14 | 19 1
+13: 14 3 | 1 12
+14: "b"
+15: 1 | 14
+16: 15 1 | 14 14
+17: 14 2 | 1 7
+18: 15 15
+19: 14 1 | 14 14
+20: 14 14 | 1 15
+21: 14 1 | 1 14
+22: 14 14
+23: 25 1 | 22 14
+24: 14 1
+25: 1 1 | 1 14
+26: 14 22 | 1 20
+27: 1 6 | 14 18
+28: 16 1
+29: 29
+30: 30
+31: 14 17 | 1 13
+32: 32
+33: 33
+34: 34
+35: 35
+36: 36
+37: 37
+38: 38
+39: 39
+40: 40
+41: 41
+42: 9 14 | 10 1
+
+abbbbbabbbaaaababbaabbbbabababbbabbbbbbabaaaa
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+aaaabbaabbaaaaaaabbbabbbaaabbaabaaa
+babaaabbbaaabaababbaabababaaab
+aabbbbbaabbbaaaaaabbbbbababaaaaabbaaabba"#;
+    
+    test!(part1() == 3);
+    test!(part2() == 12);
+    bench!(part1() == 235);
+    // bench!(part2() == 0);
+    // bench_input!(0.len == 0);
+}