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|
use advent_of_code::prelude::*;
const REQUIRED_KEYS: &[&str] =
&["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"];
pub fn parse(fh: File) -> Result<Vec<HashMap<String, String>>> {
let mut res = vec![];
let mut cur = HashMap::new();
let mut lines = parse::raw_lines(fh).peekable();
while lines.peek().is_some() {
for line in parse::chunk(&mut lines) {
for field in line.split(' ') {
let mut parts = field.split(':');
let key = parts.next().with_context(|| {
format!("failed to parse field '{}'", field)
})?;
let value = parts.next().with_context(|| {
format!("failed to parse field '{}'", field)
})?;
cur.insert(key.to_string(), value.to_string());
}
}
res.push(cur);
cur = HashMap::new();
}
if !cur.is_empty() {
res.push(cur);
}
Ok(res)
}
pub fn part1(passports: Vec<HashMap<String, String>>) -> Result<u64> {
let mut valid = 0;
for passport in passports {
let mut cur_valid = true;
for key in REQUIRED_KEYS {
if !passport.contains_key(&key.to_string()) {
cur_valid = false;
break;
}
}
if cur_valid {
valid += 1;
}
}
Ok(valid)
}
pub fn part2(passports: Vec<HashMap<String, String>>) -> Result<u64> {
let mut valid = 0;
for passport in passports {
let mut cur_valid = true;
for key in REQUIRED_KEYS {
match passport.get(&key.to_string()) {
Some(val) => {
if !validate(key, val)? {
cur_valid = false;
break;
}
}
None => {
cur_valid = false;
break;
}
}
}
if cur_valid {
valid += 1;
}
}
Ok(valid)
}
fn validate(key: &str, val: &str) -> Result<bool> {
match key {
"byr" => match val.parse::<i32>() {
Ok(year) => Ok((1920..=2002).contains(&year)),
Err(_) => Ok(false),
},
"iyr" => match val.parse::<i32>() {
Ok(year) => Ok((2010..=2020).contains(&year)),
Err(_) => Ok(false),
},
"eyr" => match val.parse::<i32>() {
Ok(year) => Ok((2020..=2030).contains(&year)),
Err(_) => Ok(false),
},
"hgt" => {
if val.len() < 3 {
Ok(false)
} else if val.ends_with("in") {
match val[0..val.len() - 2].parse::<i32>() {
Ok(inches) => Ok((59..=76).contains(&inches)),
Err(_) => Ok(false),
}
} else if val.ends_with("cm") {
match val[0..val.len() - 2].parse::<i32>() {
Ok(inches) => Ok((150..=193).contains(&inches)),
Err(_) => Ok(false),
}
} else {
Ok(false)
}
}
"hcl" => Ok(val.len() == 7
&& val.starts_with('#')
&& val[1..]
== val[1..]
.matches(|c: char| c.is_ascii_hexdigit())
.collect::<String>()),
"ecl" => Ok(val == "amb"
|| val == "blu"
|| val == "brn"
|| val == "gry"
|| val == "grn"
|| val == "hzl"
|| val == "oth"),
"pid" => Ok(val.len() == 9
&& val
== val
.matches(|c: char| c.is_ascii_digit())
.collect::<String>()),
_ => Err(anyhow!("invalid key found: {}", key)),
}
}
#[test]
fn test() {
assert_eq!(
part1(parse(parse::data(2020, 4).unwrap()).unwrap()).unwrap(),
247
);
assert_eq!(
part2(parse(parse::data(2020, 4).unwrap()).unwrap()).unwrap(),
145
);
}
|
