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Messing with speeding up day 23

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This commit is contained in:
Chris Pickett
2022-12-23 15:27:03 -06:00
parent a121992976
commit 33650996dd
1 changed files with 49 additions and 24 deletions
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73
src/23.cs
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@ -31,9 +31,10 @@ internal class Day23 : Day
}
}
private static List<(ivec2 curr, ivec2 proposed)> ConsiderMove(ICollection<ivec2> positions, int orderStart)
private static IEnumerable<(ivec2 curr, ivec2 next)> ConsiderMove(ICollection<ivec2> positions, int orderStart)
{
List<(ivec2 curr, ivec2 proposed)> considerations = new(positions.Count);
Dictionary<ivec2, ivec2> considerations = new(positions.Count);
Dictionary<ivec2, int> dupes = new();
foreach (var elfPos in positions)
{
@ -47,13 +48,26 @@ internal class Day23 : Day
var dirs = dirOrder[(i + orderStart) % dirOrder.Length];
if (!dirs.Any(d => positions.Contains(d + elfPos)))
{
considerations.Add((elfPos, elfPos + dirs[0]));
var v = elfPos + dirs[0];
if (!dupes.ContainsKey(v))
{
dupes.Add(v, 0);
}
dupes[v]++;
considerations.Add(elfPos, v);
break;
}
}
}
return considerations;
foreach (var c in considerations)
{
if (dupes[c.Value] == 1)
{
yield return (c.Key, c.Value);
}
}
}
private static int PlayOut(ICollection<ivec2> positions, int? maxRounds = null)
@ -67,30 +81,41 @@ internal class Day23 : Day
break;
}
for (int i = 0; i < considerations.Count; i++)
{
bool bDuped = false;
for (int j = i + 1; j < considerations.Count; j++)
{
if (considerations[i].proposed == considerations[j].proposed)
{
bDuped = true;
considerations.RemoveAt(j);
j--;
}
}
if (bDuped)
{
considerations.RemoveAt(i);
i--;
}
}
// for (int i = 0; i < considerations.Count; i++)
// {
// bool bDuped = false;
// foreach (var c in considerations.Skip(i + 1).Where(c => c.Value == considerations.ElementAt(i).Value))
// {
// bDuped = true;
// considerations.Remove(c.Key);
// }
//
// if (bDuped)
// {
// considerations.Remove(considerations.ElementAt(i).Key);
// i--;
// }
// // for (int j = i + 1; j < considerations.Count; j++)
// // {
// // if (considerations[i].proposed == considerations[j].proposed)
// // {
// // bDuped = true;
// // considerations.RemoveAt(j);
// // j--;
// // }
// // }
// //
// // if (bDuped)
// // {
// // considerations.RemoveAt(i);
// // i--;
// // }
// }
foreach (var move in considerations)
{
positions.Remove(move.curr);
positions.Add(move.proposed);
positions.Add(move.next);
}
}