private static Task <(Rule, string)[]> Parse(string file)
{
return(LittleHelper.Parse(file, "\n", line =>
{
var s = line.Split(':');
return (new Rule(s[0]), s[1]);
}));
public static async Task <int> Task1(string file)
{
var instructions = await LittleHelper.Parse(file, "\n", l =>
{
var instruction = l.Split(' ');
return(instruction[0], instruction[1]);
});
public static async Task <int> Task1(string file)
{
var lines = await LittleHelper.Parse(file, "\n\n", l => l);
var required = new[] { "byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid" };
return(lines.Count(line => required.All(line.Contains)));
}
private static async Task <HashSet <int> > GetSeats(string file)
{
var lines = await LittleHelper.Parse(file, "\n", s => s);
var map = new Dictionary <string, string> {
{ "F", "0" }, { "B", "1" }, { "L", "0" }, { "R", "1" }
};
var regex = new Regex(string.Join("|", map.Keys));
var seats = new HashSet <int>();
foreach (var line in lines)
{
var pass = regex.Replace(line, m => map[m.Value]);
var row = Convert.ToInt32(pass.Substring(0, 7), 2);
var col = Convert.ToInt32(pass.Substring(7, 3), 2);
var seat = row * 8 + col;
seats.Add(seat);
}
return(seats);
}
public static async Task <int> Task2(string file)
{
var lines = await LittleHelper.Parse(file, "\n\n", s => s);
var count = 0;
foreach (var line in lines)
{
var answers = line.Split("\n", StringSplitOptions.RemoveEmptyEntries)
.Select(s => s.ToCharArray())
.ToArray();
count += answers
.Skip(1)
.Aggregate(answers.First(), (p1, p2) => p1.Intersect(p2).ToArray())
.Count();
}
return(count);
}
public static async Task <int> Task2(string file)
{
var lines = await LittleHelper.Parse(file, "\n\n", l => l);
return(lines.Count(IsValid));
}
private static Task <int[]> Parse(string file)
{
return(LittleHelper.Parse(file, "\n", int.Parse));
}
public static async Task <int> Task1(string file)
{
var lines = await LittleHelper.Parse(file, "\n\n", s => s);
return(lines.Sum(line => line.Distinct().Count(char.IsLetter)));
}