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7ae3e43883
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95cadb78ae
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day-4/.gitignore
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day-4/.gitignore
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/target/
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day-4/Cargo.lock
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day-4/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 = "day-4"
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version = "0.1.0"
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dependencies = [
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"indoc",
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]
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[[package]]
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name = "indoc"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
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dependencies = [
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"indoc-impl",
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"proc-macro-hack",
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]
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[[package]]
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name = "indoc-impl"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
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dependencies = [
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"proc-macro-hack",
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"proc-macro2",
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"quote",
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"syn",
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"unindent",
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]
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[[package]]
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name = "proc-macro-hack"
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version = "0.5.19"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
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[[package]]
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name = "proc-macro2"
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version = "1.0.24"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "syn"
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version = "1.0.53"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8833e20724c24de12bbaba5ad230ea61c3eafb05b881c7c9d3cfe8638b187e68"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
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[[package]]
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name = "unindent"
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version = "0.1.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"
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@ -1,10 +0,0 @@
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[package]
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name = "day-4"
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version = "0.1.0"
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authors = ["Tristan Daniël Maat <tm@tlater.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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indoc = "0.3"
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1068
day-4/input
1068
day-4/input
File diff suppressed because it is too large
Load diff
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use std::collections::HashMap;
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use std::fs;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let input = fs::read_to_string("input")?;
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let passports = parse_passports(&input)?;
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println!("{}", validate_passports(&passports));
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Ok(())
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}
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fn parse_passports(input: &str) -> Result<Vec<HashMap<&str, &str>>, &str> {
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input
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.split("\n\n")
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.map(|passport| {
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passport
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.trim()
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.split(|c| c == ' ' || c == '\n')
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.map(|field| {
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let split = field
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.find(':')
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.ok_or("Invalid passport entry; no separator")?;
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let item = field.split_at(split);
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let key = item.0;
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let value = item
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.1
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.strip_prefix(":")
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.expect("We've already checked the separator exists");
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Ok((key, value))
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})
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.collect()
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})
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.collect()
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}
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fn validate_passports(passports: &Vec<HashMap<&str, &str>>) -> usize {
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let required_fields = ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"];
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let rules = [
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|year: &str| match year.parse() {
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Ok(1920..=2002) => true,
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_ => false,
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},
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|year: &str| match year.parse() {
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Ok(2010..=2020) => true,
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_ => false,
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},
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|year: &str| match year.parse() {
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Ok(2020..=2030) => true,
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_ => false,
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},
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|height: &str| match height.split_at(height.chars().count() - 2) {
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(height, "cm") => match height.parse() {
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Ok(150..=193) => true,
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_ => false,
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},
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(height, "in") => match height.parse() {
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Ok(59..=76) => true,
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_ => false,
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},
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_ => false,
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},
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|color: &str| match color.split_at(1) {
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("#", code) => code.chars().all(|a| char::is_ascii_hexdigit(&a)),
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_ => false,
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},
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|color: &str| {
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["amb", "blu", "brn", "gry", "grn", "hzl", "oth"]
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.iter()
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.any(|c| c == &color)
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},
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|pid: &str| pid.chars().count() == 9 && pid.chars().all(char::is_numeric),
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];
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passports
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.iter()
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.filter(|passport| {
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required_fields
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.iter()
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.zip(rules.iter())
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.all(|(field, rule)| {
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if let Some(value) = passport.get(field) {
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rule(value)
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} else {
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false
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}
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})
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})
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.count()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use indoc::indoc;
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#[test]
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fn test_simple() -> Result<(), String> {
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let example = indoc!(
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"ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
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byr:1937 iyr:2017 cid:147 hgt:183cm
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iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
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hcl:#cfa07d byr:1929
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hcl:#ae17e1 iyr:2013
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eyr:2024
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ecl:brn pid:760753108 byr:1931
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hgt:179cm
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hcl:#cfa07d eyr:2025 pid:166559648
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iyr:2011 ecl:brn hgt:59in
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"
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);
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let passports = parse_passports(example)?;
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assert_eq!(validate_passports(&passports), 2);
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Ok(())
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}
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}
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