Advent of Code 2017 Day 4

HighEntropyPassphrases.cs

int HighEntropyPassphrasesPartOne(string[] passPhrases)
{
	return DoHighEntropyPassphrases(passPhrases, w => w);
}

int HighEntropyPassphrasesPartTwo(string[] passPhrases)
{
	return DoHighEntropyPassphrases(passPhrases, w => string.Concat(w.OrderBy(c => c)));
}

int DoHighEntropyPassphrases(string[] passPhrases, Func<string, string> map)
{
	return passPhrases.Count(words =>
		{
			var set = new HashSet<string>();
			return words.Split(' ').All(word => set.Add(map(word)));
		});
}