static void Main(string[] args)
{
var input = File.ReadAllLines(args[0]);
var passports = CollectionUtils.CollectRecords(input)
.Select(l => new Passport(l));
var valid = passports.Where(p => p.IsValid());
var strictValid = valid.Where(p => p.IsStrictValid());
Console.WriteLine($"Valid passport count: {valid.Count()}");
Console.WriteLine($"Strict valid count: {strictValid.Count()}");
}
static void Main(string[] args)
{
var input = File.ReadAllLines(args[0]);
var groupAnswerSets = CollectionUtils.CollectRecords(input)
.Select(l => l.Split())
.Select(ls => ls.Select(s => new HashSet <char>(s)));
var anyAnswered = groupAnswerSets.Select(ld => ld.Aggregate((d, d1) => {
var ns = new HashSet <char>(d);
ns.UnionWith(d1);
return(ns);
}));
var anyAnsweredCount = anyAnswered.Select(d => d.Count()).Sum();
var allAnswered = groupAnswerSets.Select(ld => ld.Aggregate((d, d1) => {
var ns = new HashSet <char>(d);
ns.IntersectWith(d1);
return(ns);
}));
var allAnsweredCount = allAnswered.Select(d => d.Count()).Sum();
Console.WriteLine($"Sum of answered question sets (any answered): {anyAnsweredCount}");
Console.WriteLine($"Sum of answered question sets (all answered): {allAnsweredCount}");
}
