public static int Strategy1(SleepLog sleepLog)
{
var biggestSleeper = sleepLog.TotalSleep.Aggregate((l, r) => l.Value > r.Value ? l : r).Key;
var mostSleptMinute = sleepLog.MinuteAsleep[biggestSleeper].Aggregate((l, r) => l.Value > r.Value ? l : r).Key;
return(biggestSleeper * mostSleptMinute);
}
public static SleepLog ReadLogs(IList <string> input)
{
var logs = ParseInput(input);
var sleepLog = new SleepLog();
var currentId = -1;
var fellAsleep = -1;
foreach (var log in logs)
{
if (log.Message.Contains("begins shift"))
{
currentId = Convert.ToInt32(Regex.Match(log.Message, @"#(\d+) ").Groups[1].Value);
continue;
}
if (log.Message.Contains("falls asleep"))
{
fellAsleep = log.TimeStamp.Minute;
continue;
}
if (log.Message.Contains("wakes up"))
{
var wokeUp = log.TimeStamp.Minute;
if (!sleepLog.MinuteAsleep.ContainsKey(currentId))
{
sleepLog.MinuteAsleep.Add(currentId, new Dictionary <int, int>());
}
for (var t = fellAsleep; t < wokeUp; t++)
{
if (!sleepLog.MinuteAsleep[currentId].ContainsKey(t))
{
sleepLog.MinuteAsleep[currentId].Add(t, 0);
}
sleepLog.MinuteAsleep[currentId][t]++;
}
if (!sleepLog.TotalSleep.ContainsKey(currentId))
{
sleepLog.TotalSleep.Add(currentId, 0);
}
sleepLog.TotalSleep[currentId] += wokeUp - fellAsleep;
}
}
return(sleepLog);
}
public static int Strategy2(SleepLog sleepLog)
{
// (Guard ID : Most frequent minute
var guardMax = new Dictionary <int, int>();
foreach (var guard in sleepLog.MinuteAsleep.Keys)
{
var mostFrequentMinute = sleepLog.MinuteAsleep[guard].Aggregate((l, r) => l.Value > r.Value ? l : r).Value;
guardMax.Add(guard, mostFrequentMinute);
}
var winner = guardMax.Aggregate((l, r) => l.Value > r.Value ? l : r).Key;
return(winner * sleepLog.MinuteAsleep[winner].Aggregate((l, r) => l.Value > r.Value ? l : r).Key);
}
