138 lines
3.2 KiB
D
138 lines
3.2 KiB
D
module day4.part2.main;
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import std;
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void main()
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{
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readText("input").parsePassports.countValidPassports.writeln;
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}
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alias Passport = string[string];
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auto parsePassports(string input)
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{
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return input.splitter("\n\n").map!(passport => passport.splitter().map!((entry) {
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auto keyAndValue = entry.split(':');
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return tuple(keyAndValue[0], keyAndValue[1]);
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}).assocArray);
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}
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enum Field : string
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{
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birthYear = "byr",
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issueYear = "iyr",
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expirationYear = "eyr",
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height = "hgt",
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hairColor = "hcl",
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eyeColor = "ecl",
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passportID = "pid",
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countryID = "cid",
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}
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bool isValidYear(int min, int max)(string yr)
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{
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if (yr.length != 4 || yr.canFind!(not!isDigit))
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return false;
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auto year = yr.to!int;
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return year >= min && year <= max;
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}
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alias isValidBirthYear = isValidYear!(1920, 2002);
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alias isValidIssueYear = isValidYear!(2010, 2020);
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alias isValidExpirationYear = isValidYear!(2020, 2030);
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bool isValidHeight(string hgt)
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{
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auto match = hgt.matchFirst(r"^(\d+)(cm|in)$");
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if (!match || match.length != 3)
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return false;
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auto number = match[1].to!int;
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switch (match[2])
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{
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case "cm":
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return number >= 150 && number <= 193;
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break;
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case "in":
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return number >= 59 && number <= 76;
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default:
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return false;
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}
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}
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bool isValidHairColor(string hcl)
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{
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return hcl.matchFirst(r"^#[0-9a-f]{6}$").to!bool;
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}
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bool isValidEyeColor(string ecl)
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{
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return ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"].canFind(ecl);
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}
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bool isValidPassportID(string pid)
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{
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return pid.matchFirst(r"^\d{9}$").to!bool;
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}
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enum requiredFields = [
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Field.birthYear, Field.issueYear, Field.expirationYear, Field.height,
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Field.hairColor, Field.eyeColor, Field.passportID
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];
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bool isValidPassport(Passport passport)
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{
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return requiredFields.all!(field => field in passport)
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&& isValidBirthYear(passport[Field.birthYear])
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&& isValidIssueYear(passport[Field.issueYear])
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&& isValidExpirationYear(passport[Field.expirationYear])
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&& isValidHeight(passport[Field.height])
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&& isValidHairColor(passport[Field.hairColor])
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&& isValidEyeColor(passport[Field.eyeColor])
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&& isValidPassportID(passport[Field.passportID]);
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}
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auto countValidPassports(R)(R r) if (isInputRange!R && is(ElementType!R == Passport))
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{
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return r.filter!isValidPassport.count;
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}
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unittest
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{
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auto input = `eyr:1972 cid:100
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hcl:#18171d ecl:amb hgt:170 pid:186cm iyr:2018 byr:1926
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iyr:2019
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hcl:#602927 eyr:1967 hgt:170cm
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ecl:grn pid:012533040 byr:1946
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hcl:dab227 iyr:2012
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ecl:brn hgt:182cm pid:021572410 eyr:2020 byr:1992 cid:277
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hgt:59cm ecl:zzz
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eyr:2038 hcl:74454a iyr:2023
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pid:3556412378 byr:2007`;
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auto passPorts = input.parsePassports;
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assert(passPorts.countValidPassports == 0);
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}
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unittest
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{
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auto input = `pid:087499704 hgt:74in ecl:grn iyr:2012 eyr:2030 byr:1980
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hcl:#623a2f
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eyr:2029 ecl:blu cid:129 byr:1989
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iyr:2014 pid:896056539 hcl:#a97842 hgt:165cm
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hcl:#888785
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hgt:164cm byr:2001 iyr:2015 cid:88
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pid:545766238 ecl:hzl
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eyr:2022
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iyr:2010 hgt:158cm hcl:#b6652a ecl:blu byr:1944 eyr:2021 pid:093154719`;
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auto passPorts = input.parsePassports;
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assert(passPorts.countValidPassports == 4);
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}
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