public override string PartOne(string input)
{
var rules = ParseRules(input.Paragraphs().First());
var expanded = new ExpandedRule(0, rules);
var messages = input.Paragraphs()
.Last()
.ParseLines(line => line.Select(c => c == 'a' ? 2 : 118)
.ToList());
var result = messages.Count(m => expanded.MatchesMessage(m).Any(c => c == m.Count));
return(result.ToString());
}
public override string PartTwo(string input)
{
var rules = ParseRules(input.Paragraphs().First());
var eight = (42, -1, 42, 8, -1);
var eleven = (42, 31, 42, 11, 31);
rules[8] = eight;
rules[11] = eleven;
var expanded = new ExpandedRule(0, rules);
var messages = input.Paragraphs()
.Last()
.ParseLines(line => line.Select(c => c == 'a' ? 2 : 118)
.ToList());
var result = messages.Count(m => expanded.MatchesMessage(m).Any(c => c == m.Count));
return(result.ToString());
}