static void Main(string[] args)
{
var groups = new List <Group>();
var currentAnswers = new CharacterCountDictionary();
int numPeople = 0;
using (TextReader reader = File.OpenText("input.txt"))
{
Action recordGroup = () =>
{
if (numPeople > 0)
{
groups.Add(new Group()
{
Answers = currentAnswers, NumPeople = numPeople
});
currentAnswers = new CharacterCountDictionary();
numPeople = 0;
}
};
while (reader.Peek() >= 0)
{
string line = reader.ReadLine();
if (String.IsNullOrWhiteSpace(line))
{
recordGroup();
}
else
{
++numPeople;
foreach (char character in line)
{
int count;
if (currentAnswers.TryGetValue(character, out count))
{
++count;
}
else
{
count = 1;
}
currentAnswers[character] = count;
}
}
}
recordGroup();
int uniqueSum = 0;
int unifiedSum = 0;
foreach (var group in groups)
{
uniqueSum += group.Answers.Count;
group.Answers.Values.ToList().ForEach(answerCount => unifiedSum += (group.NumPeople == answerCount) ? 1 : 0);
}
Console.WriteLine("Sum of unique answers per-group: {0}", uniqueSum);
Console.WriteLine("Sum of unified answers per-group: {0}", unifiedSum);
}
}
public char Execute(string input)
{
var util = new CharacterCountDictionary(input);
return(util.MaxKvp.Key);
}
