81 lines
2.1 KiB
Rust
81 lines
2.1 KiB
Rust
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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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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.all(|field| passport.contains_key(field))
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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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