public static int GetNumberOfValidPassports(
IList <Passport> passports,
PassportPolicy passportPolicy)
{
var result = passports
.Where(p => PassportHelper.GetIsValidPassport(p, passportPolicy))
.Count();
return(result);
}
private static IList <Passport> GetDay04Input()
{
string filePath = Path.Combine(Directory.GetCurrentDirectory(), "InputData", FILE_NAME);
if (!File.Exists(filePath))
{
throw new Exception($"Cannot locate file {filePath}");
}
var inputLines = File.ReadAllLines(filePath);
var result = PassportHelper.ParseInputLines(inputLines);
return(result);
}
public static int GetDay04Part01Answer()
{
// --- Day 4: Passport Processing ---
// You arrive at the airport only to realize that you grabbed your North Pole Credentials instead of your passport.While these documents are extremely similar, North Pole Credentials aren't issued by a country and therefore aren't actually valid documentation for travel in most of the world.
// It seems like you're not the only one having problems, though; a very long line has formed for the automatic passport scanners, and the delay could upset your travel itinerary.
// Due to some questionable network security, you realize you might be able to solve both of these problems at the same time.
// The automatic passport scanners are slow because they're having trouble detecting which passports have all required fields. The expected fields are as follows:
// byr(Birth Year)
// iyr(Issue Year)
// eyr(Expiration Year)
// hgt(Height)
// hcl(Hair Color)
// ecl(Eye Color)
// pid(Passport ID)
// cid(Country ID)
// Passport data is validated in batch files(your puzzle input).Each passport is represented as a sequence of key:value pairs separated by spaces or newlines.Passports are separated by blank lines.
// Here is an example batch file containing four passports:
// ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
// byr:1937 iyr:2017 cid:147 hgt:183cm
// iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
// hcl:#cfa07d byr:1929
// hcl:#ae17e1 iyr:2013
// eyr:2024
// ecl:brn pid:760753108 byr:1931
// hgt:179cm
// hcl:#cfa07d eyr:2025 pid:166559648
// iyr:2011 ecl:brn hgt:59in
// The first passport is valid - all eight fields are present.The second passport is invalid - it is missing hgt (the Height field).
// The third passport is interesting; the only missing field is cid, so it looks like data from North Pole Credentials, not a passport at all! Surely, nobody would mind if you made the system temporarily ignore missing cid fields. Treat this "passport" as valid.
// The fourth passport is missing two fields, cid and byr.Missing cid is fine, but missing any other field is not, so this passport is invalid.
// 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?
// Answer: 228
var passports = GetDay04Input();
var numberOfValidPassports = PassportHelper.GetNumberOfValidPassports(passports, PassportPolicyPart01);
return(numberOfValidPassports);
}
public static int GetDay04Part02Answer()
{
// --- 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?
// Answer: 175
var passports = GetDay04Input();
var numberOfValidPassports = PassportHelper.GetNumberOfValidPassports(passports, PassportPolicyPart02);
return(numberOfValidPassports);
}
