rust(day19): Part 1

This commit is contained in:
Sijmen 2020-12-19 16:04:37 +01:00
parent 834c86e09a
commit a9cee17a28
Signed by: vijfhoek
GPG key ID: DAF7821E067D9C48

View file

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