public override void PartTwo()
{
var total = 0;
var expected = new Dictionary <char, int>
{
['a'] = 8,
['b'] = 6,
['c'] = 8,
['d'] = 7,
['e'] = 4,
['f'] = 9,
['g'] = 7,
};
foreach (var entry in Input)
{
var possible = new OneToOne <char, char>();
possible.AddValues("abcdefg");
possible.AddKeys("abcdefg");
var(input, output) = entry.SingleSplit(" | ");
var pattern = input.Spaced().ToList();
var result = output.Spaced().ToList();
foreach (var s in pattern)
{
if (s.Length == 2)
{
possible.MustBe(s, "cf");
}
else if (s.Length == 3)
{
possible.MustBe(s, "acf");
}
else if (s.Length == 4)
{
possible.MustBe(s, "bdcf");
}
}
var actual = pattern.Flatten().Frequencies().ToDictionary();
possible.ReduceWithFrequencies(expected, actual);
var map = possible.Mappings();
var value = result.Select(s => s.Select(c => map[c]).Sorted().Str())
.Select(s => s switch
{
"abcefg" => 0,
"cf" => 1,
"acdeg" => 2,
"acdfg" => 3,
"bcdf" => 4,
"abdfg" => 5,
"abdefg" => 6,
"acf" => 7,
"abcdefg" => 8,
"abcdfg" => 9,
_ => 0
}).Str().AsInt();
