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www.mikescher.com/www/statics/aoc/2018/04_solution-1.linq

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2019-11-02 20:19:34 +01:00
<Query Kind="Statements" />
var guards = new List<(int id, int awake, int[] minutes)>();
var data = File
.ReadAllLines(Path.Combine(Path.GetDirectoryName(Util.CurrentQueryPath), @"04_input.txt"))
.Where(p=>!string.IsNullOrWhiteSpace(p))
.OrderBy(p=>p);
int guard=-1;
int wakeup=0;
int wakesum=0;
bool awake=true;
int[] mins = new int[60];
foreach (var line in data)
{
int m = int.Parse(line.Substring(15,2));
if (line.Contains("Guard"))
{
if (awake)
{
wakesum += (60 - wakeup);
for (int i = wakeup; i < 60; mins[i++] = 1) ;
}
if (guard>=0)guards.Add((guard, wakesum, mins));
guard = int.Parse(line.Substring(26).Split(' ')[0]);
awake=true;
wakeup=0;
wakesum=0;
mins = new int[60];
}
else if (line.Contains("falls asleep"))
{
awake = false;
wakesum += (m-wakeup);
for (int i = wakeup; i < m; mins[i++]=1);
}
else if (line.Contains("wakes up"))
{
awake = true;
wakeup=m;
}
else throw new Exception();
}
guards
.GroupBy(g => g.id)
.Select(p => new
{
id = p.Key,
awake_total = p.Sum(q => q.awake),
asleep_total = p.Sum(q => 60 - q.awake),
mins = p.Select(q => q.minutes).Aggregate((a, b) => a.Zip(b, (u, v) => u + v).ToArray())
})
.Select(p => new
{
id = p.id,
awake_total = p.awake_total,
asleep_total = p.asleep_total,
mins = p.mins,
most_sleep_min = p.mins.Select((v, i) => (v, i)).OrderBy(q => q.v)
})
.Select(p => new
{
id = p.id,
awake_total = p.awake_total,
asleep_total = p.asleep_total,
mins = p.mins,
most_sleep_min = p.most_sleep_min,
result = p.most_sleep_min.First().i * p.id
})
.OrderByDescending(p => p.asleep_total)
.First()
.result
.Dump();