static void Day04()
{
var inputs = GetInputs(4, true);
var valid = 0;
var valid2 = 0;
var fields = new System.Collections.Generic.Dictionary <string, bool?> {
{ "byr", null }, { "iyr", null },
{ "eyr", null }, { "hgt", null },
{ "hcl", null }, { "ecl", null },
{ "pid", null }, { "cid", null },
};
for (var i = 0; i <= inputs.Length; i++)
{
if (i >= inputs.Length || inputs[i].Length == 0)
{
if (fields.All(kvp => kvp.Key == "cid" || kvp.Value.HasValue))
{
valid++;
}
if (fields.All(kvp => kvp.Key == "cid" || kvp.Value != null && kvp.Value.Value))
{
valid2++;
}
foreach (var k in fields.Keys.ToArray())
{
fields[k] = null;
}
continue;
}
foreach (var kvp in inputs[i].Split(' ').Select(a => a.Split(':')))
{
if (fields.ContainsKey(kvp[0]))
{
fields[kvp[0]] = false;
switch (kvp[0])
{
case "byr": {
if (int.TryParse(kvp[1], out var val))
{
fields[kvp[0]] = val >= 1920 && val <= 2002;
}
break;
}
case "iyr": {
if (int.TryParse(kvp[1], out var val))
{
fields[kvp[0]] = val >= 2010 && val <= 2020;
}
break;
}
case "eyr": {
if (int.TryParse(kvp[1], out var val))
{
fields[kvp[0]] = val >= 2020 && val <= 2030;
}
break;
}
case "hgt": {
if (int.TryParse(kvp[1].Substring(0, kvp[1].Length - 2), out var val))
{
fields[kvp[0]] = (kvp[1].EndsWith("cm") && val >= 150 && val <= 193) || (kvp[1].EndsWith("in") && val >= 59 && val <= 76);
}
break;
}
case "hcl": {
if (kvp[1].Length == 7 && kvp[1][0] == '#')
{
fields[kvp[0]] = int.TryParse(kvp[1].Substring(1), System.Globalization.NumberStyles.HexNumber, null, out _);
}
break;
}
case "ecl": {
fields[kvp[0]] = (new string[] { "amb", "blu", "brn", "gry", "grn", "hzl", "oth" }).Contains(kvp[1]);
break;
}
case "pid": {
fields[kvp[0]] = kvp[1].Length == 9 && int.TryParse(kvp[1], out _);
break;
}
case "cid": {
fields[kvp[0]] = true;
break;
}
}
}
}
}
Console.WriteLine($"Day 4-1 Answer: {valid}");
Console.WriteLine($"Day 4-2 Answer: {valid2}");
}
