public int GetFourDigitDisplay()
{
List <string> signalPatterns = SignalPatterns;
Dictionary <string, int>?numbers = signalPatterns.ToDictionary(sp => sp, _ => - 1);
string[] patterns = new string[10];
SetPatternNumber(signalPatterns.Where(sp => sp.Length == 2).Single(), 1);
SetPatternNumber(signalPatterns.Where(sp => sp.Length == 3).Single(), 7);
SetPatternNumber(signalPatterns.Where(sp => sp.Length == 4).Single(), 4);
SetPatternNumber(signalPatterns.Where(sp => sp.Length == 7).Single(), 8);
signalPatterns.RemoveAll(s => patterns.Contains(s));
foreach (string signalPattern in signalPatterns.Where(sp => sp.Length == 6))
{
if (signalPattern.ContainsAllWires(patterns[4]))
{
SetPatternNumber(signalPattern, 9);
}
else if (signalPattern.ContainsAllWires(patterns[7]))
{
SetPatternNumber(signalPattern, 0);
}
else
{
SetPatternNumber(signalPattern, 6);
}
}
signalPatterns.RemoveAll(s => patterns.Contains(s));
foreach (string signalPattern in signalPatterns)
{
if (signalPattern.ContainsAllWires(patterns[1]))
{
SetPatternNumber(signalPattern, 3);
}
else if (patterns[6].ContainsAllWires(signalPattern))
{
SetPatternNumber(signalPattern, 5);
}
else
{
SetPatternNumber(signalPattern, 2);
}
}
return(int.Parse(String.Join("", OutputValues.Select(o => numbers[o]))));
void SetPatternNumber(string signalPattern, int number)
{
patterns[number] = signalPattern;
numbers[signalPattern] = number;
}
}