public AnswerModel Solve()
{
AnswerModel answer = new AnswerModel();
List <LogEntry> logEntries = new List <LogEntry>();
Dictionary <int, Guard> guards = new Dictionary <int, Guard>();
foreach (string line in _input)
{
// Create a log entry out of every line.
Match match = _regex.Match(line);
LogEntry entry = new LogEntry(match);
logEntries.Add(entry);
// If the logentries contains a guard that is not found earlyer add the guard.
if (entry.GuardId != 0 && !guards.ContainsKey(entry.GuardId))
{
guards.Add(entry.GuardId, new Guard(entry.GuardId));
}
}
// Sort the logentries based on there timestamp.
logEntries.Sort((x, y) => x.TimeStamp.CompareTo(y.TimeStamp));
Guard currentGuard = null;
// keep track of last time asleep.
LogEntry lastAsleep = new LogEntry();
// Itterate over logentries.
foreach (LogEntry logEntry in logEntries)
{
switch (logEntry.Event)
{
case LogEvent.StartShift:
currentGuard = guards[logEntry.GuardId];
break;
case LogEvent.FallAsleep:
lastAsleep = logEntry;
break;
case LogEvent.WakeUp:
currentGuard.AddSleep(lastAsleep, logEntry);
break;
}
}
Guard mostSleep = guards.OrderByDescending(guard => guard.Value.TotalAsleep).First().Value;
answer.PartA = (mostSleep.Id * mostSleep.HighestMinute);
Guard highFrequency = guards.OrderByDescending(guard => guard.Value.HighestFrequency).First().Value;
answer.PartB = (highFrequency.Id * highFrequency.HighestMinute);
return(answer);
}