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Day 4 part 2.

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This commit is contained in:
Bill Thiede 2020-12-04 17:51:04 -08:00
parent 0ff14b83d3
commit c6194437c3
1 changed files with 183 additions and 2 deletions
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185
2020/src/day4.rs
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@ -41,6 +41,71 @@
//! According to the above rules, your improved system would report 2 valid passports.
//!
//! Count the number of valid passports - those that have all required fields. Treat cid as optional. In your batch file, how many passports are valid?
//!
//! --- Part Two ---
//! The line is moving more quickly now, but you overhear airport security talking about how passports with invalid data are getting through. Better add some data validation, quick!
//!
//! You can continue to ignore the cid field, but each other field has strict rules about what values are valid for automatic validation:
//!
//! byr (Birth Year) - four digits; at least 1920 and at most 2002.
//! iyr (Issue Year) - four digits; at least 2010 and at most 2020.
//! eyr (Expiration Year) - four digits; at least 2020 and at most 2030.
//! hgt (Height) - a number followed by either cm or in:
//! If cm, the number must be at least 150 and at most 193.
//! If in, the number must be at least 59 and at most 76.
//! hcl (Hair Color) - a # followed by exactly six characters 0-9 or a-f.
//! ecl (Eye Color) - exactly one of: amb blu brn gry grn hzl oth.
//! pid (Passport ID) - a nine-digit number, including leading zeroes.
//! cid (Country ID) - ignored, missing or not.
//! Your job is to count the passports where all required fields are both present and valid according to the above rules. Here are some example values:
//!
//! byr valid: 2002
//! byr invalid: 2003
//!
//! hgt valid: 60in
//! hgt valid: 190cm
//! hgt invalid: 190in
//! hgt invalid: 190
//!
//! hcl valid: #123abc
//! hcl invalid: #123abz
//! hcl invalid: 123abc
//!
//! ecl valid: brn
//! ecl invalid: wat
//!
//! pid valid: 000000001
//! pid invalid: 0123456789
//! Here are some invalid passports:
//!
//! eyr:1972 cid:100
//! hcl:#18171d ecl:amb hgt:170 pid:186cm iyr:2018 byr:1926
//!
//! iyr:2019
//! hcl:#602927 eyr:1967 hgt:170cm
//! ecl:grn pid:012533040 byr:1946
//!
//! hcl:dab227 iyr:2012
//! ecl:brn hgt:182cm pid:021572410 eyr:2020 byr:1992 cid:277
//!
//! hgt:59cm ecl:zzz
//! eyr:2038 hcl:74454a iyr:2023
//! pid:3556412378 byr:2007
//! Here are some valid passports:
//!
//! pid:087499704 hgt:74in ecl:grn iyr:2012 eyr:2030 byr:1980
//! hcl:#623a2f
//!
//! eyr:2029 ecl:blu cid:129 byr:1989
//! iyr:2014 pid:896056539 hcl:#a97842 hgt:165cm
//!
//! hcl:#888785
//! hgt:164cm byr:2001 iyr:2015 cid:88
//! pid:545766238 ecl:hzl
//! eyr:2022
//!
//! iyr:2010 hgt:158cm hcl:#b6652a ecl:blu byr:1944 eyr:2021 pid:093154719
//! Count the number of valid passports - those that have all required fields and valid values. Continue to treat cid as optional. In your batch file, how many passports are valid?
use aoc_runner_derive::{aoc, aoc_generator};
@ -64,8 +129,72 @@ struct Passport {
cid: Option<String>,
}
fn valid_num(s: &Option<String>, min: u32, max: u32) -> bool {
match s {
Some(yr) => match yr.parse() {
Ok(n) => min <= n && n <= max,
Err(_) => false,
},
None => false,
}
}
fn valid_height(s: &Option<String>) -> bool {
if let Some(h) = s {
if h.ends_with("cm") {
return valid_num(&Some(h[..h.len() - 2].to_string()), 150, 193);
};
if h.ends_with("in") {
return valid_num(&Some(h[..h.len() - 2].to_string()), 59, 76);
};
}
false
}
fn valid_hair_color(s: &Option<String>) -> bool {
if let Some(h) = s {
let chars: Vec<_> = h.chars().collect();
if chars.len() != 7 {
return false;
}
for c in &chars[1..] {
if &'0' <= c && c <= &'f' {
continue;
}
}
return true;
}
false
}
fn valid_eye_color(s: &Option<String>) -> bool {
if let Some(c) = s {
return match c.as_str() {
"amb" | "blu" | "brn" | "gry" | "grn" | "hzl" | "oth" => true,
_ => false,
};
}
false
}
fn valid_passport_id(s: &Option<String>) -> bool {
if let Some(pid) = s {
if pid.len() != 9 {
return false;
}
for c in pid.chars() {
if '0' <= c && c <= '9' {
continue;
}
}
return true;
}
false
}
impl Passport {
fn is_valid(&self) -> bool {
fn is_valid_part1(&self) -> bool {
self.byr.is_some()
&& self.iyr.is_some()
&& self.eyr.is_some()
@ -74,6 +203,16 @@ impl Passport {
&& self.ecl.is_some()
&& self.pid.is_some()
}
fn is_valid_part2(&self) -> bool {
valid_num(&self.byr, 1920, 2002)
&& valid_num(&self.iyr, 2010, 2020)
&& valid_num(&self.eyr, 2020, 2030)
&& valid_height(&self.hgt)
&& valid_hair_color(&self.hcl)
&& valid_eye_color(&self.ecl)
&& valid_passport_id(&self.pid)
}
}
impl From<&str> for Passport {
@ -108,7 +247,12 @@ fn parse(input: &str) -> Vec<Passport> {
#[aoc(day4, part1)]
fn solution_part1(passports: &[Passport]) -> usize {
passports.iter().filter(|p| p.is_valid()).count()
passports.iter().filter(|p| p.is_valid_part1()).count()
}
#[aoc(day4, part2)]
fn solution_part2(passports: &[Passport]) -> usize {
passports.iter().filter(|p| p.is_valid_part2()).count()
}
#[cfg(test)]
@ -177,4 +321,41 @@ iyr:2011 ecl:brn hgt:59in
]
);
}
#[test]
fn invalid_part2() {
let input = r##"eyr:1972 cid:100
hcl:#18171d ecl:amb hgt:170 pid:186cm iyr:2018 byr:1926
iyr:2019
hcl:#602927 eyr:1967 hgt:170cm
ecl:grn pid:012533040 byr:1946
hcl:dab227 iyr:2012
ecl:brn hgt:182cm pid:021572410 eyr:2020 byr:1992 cid:277
hgt:59cm ecl:zzz
eyr:2038 hcl:74454a iyr:2023
pid:3556412378 byr:2007
"##;
assert_eq!(solution_part2(&parse(input)), 0);
}
#[test]
fn valid_part2() {
let input = r##"pid:087499704 hgt:74in ecl:grn iyr:2012 eyr:2030 byr:1980
hcl:#623a2f
eyr:2029 ecl:blu cid:129 byr:1989
iyr:2014 pid:896056539 hcl:#a97842 hgt:165cm
hcl:#888785
hgt:164cm byr:2001 iyr:2015 cid:88
pid:545766238 ecl:hzl
eyr:2022
iyr:2010 hgt:158cm hcl:#b6652a ecl:blu byr:1944 eyr:2021 pid:093154719
"##;
assert_eq!(solution_part2(&parse(input)), 4);
}
}