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|
use anyhow::Context as _;
const REQUIRED_KEYS: &[&str] =
&["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"];
pub fn part1() -> anyhow::Result<()> {
let batch = crate::util::read_file_str("data/4.txt")?;
let mut valid = 0;
for passport in parse(&batch)? {
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;
}
}
println!("{}", valid);
Ok(())
}
pub fn part2() -> anyhow::Result<()> {
let batch = crate::util::read_file_str("data/4.txt")?;
let mut valid = 0;
for passport in parse(&batch)? {
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;
}
}
println!("{}", valid);
Ok(())
}
fn parse(
batch: &str,
) -> anyhow::Result<Vec<std::collections::HashMap<String, String>>> {
let mut res = vec![];
let mut cur = std::collections::HashMap::new();
for line in batch.lines() {
if line.is_empty() {
res.push(cur);
cur = std::collections::HashMap::new();
continue;
}
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());
}
}
if !cur.is_empty() {
res.push(cur);
}
Ok(res)
}
fn validate(key: &str, val: &str) -> anyhow::Result<bool> {
match key {
"byr" => match val.parse::<i32>() {
Ok(year) => Ok(year >= 1920 && year <= 2002),
Err(_) => Ok(false),
},
"iyr" => match val.parse::<i32>() {
Ok(year) => Ok(year >= 2010 && year <= 2020),
Err(_) => Ok(false),
},
"eyr" => match val.parse::<i32>() {
Ok(year) => Ok(year >= 2020 && year <= 2030),
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(inches >= 59 && inches <= 76),
Err(_) => Ok(false),
}
} else if val.ends_with("cm") {
match val[0..val.len() - 2].parse::<i32>() {
Ok(inches) => Ok(inches >= 150 && inches <= 193),
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::anyhow!("invalid key found: {}", key)),
}
}
|
