rust(day19): Part 1
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rust/src/main.rs
127
rust/src/main.rs
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@ -669,6 +669,130 @@ mod day16 {
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}
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}
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mod day17 {
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use std::time::Duration;
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pub fn run(_print: bool) -> Duration {
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Duration::new(0, 0)
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}
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}
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mod day18 {
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use std::time::Duration;
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pub fn run(_print: bool) -> Duration {
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Duration::new(0, 0)
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}
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}
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mod day19 {
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use std::collections::BTreeMap as HashMap;
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use std::time::Duration;
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#[derive(Debug)]
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enum Rhs {
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Terminal(char),
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Variables(Vec<Vec<usize>>),
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}
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type Rules = HashMap<usize, Rhs>;
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fn parse(input: &str) -> Option<(Rules, Vec<&str>)> {
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let mut rules = HashMap::new();
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let mut messages = Vec::new();
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let mut parsing_rules = true;
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for line in input.lines() {
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let trim = line.trim();
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if trim.is_empty() {
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parsing_rules = false;
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continue;
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}
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if parsing_rules {
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let mut split = trim.split(": ");
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let lhs: usize = split.next()?.parse().ok()?;
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let terms = split.next()?;
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let rhs = if terms.starts_with('"') {
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Rhs::Terminal(terms.chars().nth(1)?)
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} else {
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Rhs::Variables(
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terms
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.split(" | ")
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.map(|t| t.split(" ").flat_map(str::parse).collect())
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.collect(),
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)
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};
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rules.insert(lhs, rhs);
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} else {
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messages.push(trim);
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}
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}
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Some((rules, messages))
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}
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pub fn run(_print: bool) -> Duration {
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let input = std::fs::read_to_string("../inputs/19").unwrap();
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println!("from typing import Tuple");
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println!();
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let (rules, messages) = parse(&input).unwrap();
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for (i, rule) in rules.iter() {
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println!("def rule_{}(s: str) -> Tuple[bool, str]:", i);
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match rule {
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Rhs::Terminal(terminal) => {
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println!(" if s[0] == '{}':", terminal);
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println!(" return True, s[1:]");
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println!(" return False, s");
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}
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Rhs::Variables(variables) => {
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for term in variables {
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println!(" r = s");
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for (j, variable) in term.iter().enumerate() {
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println!(" valid_{}, r = rule_{}(r)", j, variable);
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}
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println!(" if all((");
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for j in 0..term.len() {
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println!(" valid_{}, ", j);
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}
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println!(" )):");
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println!(" return True, r");
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println!();
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}
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println!(" return False, s");
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}
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}
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println!();
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println!();
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}
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println!("def validate(s):");
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for i in 0..rules.len() {
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println!(" if rule_{}(s) == (True, ''):", i);
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println!(" return True");
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}
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println!(" return False");
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println!();
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println!("if __name__ == '__main__':");
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println!(" part1 = 0");
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for message in messages {
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println!(" if (result := validate('{}')):", message);
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println!(" part1 += 1");
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println!(" print('{}:', result)", message);
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println!();
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}
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println!(" print('Part 1:', part1)");
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Duration::new(0, 0)
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}
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}
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fn main() {
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let days = [
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day01::run,
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@ -687,6 +811,9 @@ fn main() {
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day14::run,
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day15::run,
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day16::run,
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day17::run,
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day18::run,
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day19::run,
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];
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if let Some(day) = std::env::args().nth(1) {
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