protected override object SolvePart2()
{
var groups = InputComplete.Split("\r\n\r\n").Select(group => group.Split("\r\n"));
var numberOfQuestionsEveryOneAnsweredYes = new List <int>();
foreach (var group in groups)
{
IEnumerable <char> answeredYesByEveryone = null;
foreach (string personAnswers in group)
{
answeredYesByEveryone = answeredYesByEveryone == null?personAnswers.ToCharArray() : personAnswers.Intersect(answeredYesByEveryone);
}
numberOfQuestionsEveryOneAnsweredYes.Add(answeredYesByEveryone.Count());
}
return(numberOfQuestionsEveryOneAnsweredYes.Sum());
}
protected override object SolvePart1()
{
var groups = InputComplete.Split("\r\n\r\n").ToList();
return(groups.Select(group => group.Replace("\r\n", "").Distinct().Count()).Sum());
}