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Day 23 solution

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Part 2 takes 7 seconds on my macbook, which I'd like to improve, but this gets the answer.
This commit is contained in:
Chris Pickett
2022-12-23 13:31:50 -06:00
parent d63a49b131
commit a121992976
6 changed files with 234 additions and 5 deletions
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advent-of-code-2022.csproj
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src/23.cs Normal file
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using System.Collections.Immutable;
using aoc2022.Util;
namespace aoc2022;
internal class Day23 : Day
{
private readonly HashSet<ivec2> elves = new();
private static readonly ivec2[][] dirOrder =
{
new[]{ivec2.UP, ivec2.UP + ivec2.RIGHT, ivec2.UP + ivec2.LEFT},
new[]{ivec2.DOWN, ivec2.DOWN + ivec2.RIGHT, ivec2.DOWN + ivec2.LEFT},
new[]{ivec2.LEFT, ivec2.UP + ivec2.LEFT, ivec2.DOWN + ivec2.LEFT},
new[]{ivec2.RIGHT, ivec2.UP + ivec2.RIGHT, ivec2.DOWN + ivec2.RIGHT},
};
internal override void Parse()
{
var lines = Parsing.ReadAllLines("23").ToImmutableList();
for (int row = 0; row < lines.Count; row++)
{
var line = lines[row];
for (int col = 0; col < line.Length; col++)
{
if (line[col] == '#')
{
elves.Add(new ivec2(col, row));
}
}
}
}
private static List<(ivec2 curr, ivec2 proposed)> ConsiderMove(ICollection<ivec2> positions, int orderStart)
{
List<(ivec2 curr, ivec2 proposed)> considerations = new(positions.Count);
foreach (var elfPos in positions)
{
if (!elfPos.GetNeighbors().Any(positions.Contains))
{
continue;
}
for (int i = 0; i < dirOrder.Length; i++)
{
var dirs = dirOrder[(i + orderStart) % dirOrder.Length];
if (!dirs.Any(d => positions.Contains(d + elfPos)))
{
considerations.Add((elfPos, elfPos + dirs[0]));
break;
}
}
}
return considerations;
}
private static int PlayOut(ICollection<ivec2> positions, int? maxRounds = null)
{
int round;
for (round = 0; (maxRounds == null || round < maxRounds); round++)
{
var considerations = ConsiderMove(positions, round);
if (!considerations.Any())
{
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--;
}
}
foreach (var move in considerations)
{
positions.Remove(move.curr);
positions.Add(move.proposed);
}
}
return round + 1;
}
private static long GetEmptySpots(ICollection<ivec2> positions)
{
var minY = positions.MinBy(p => p.y).y;
var minX = positions.MinBy(p => p.x).x;
var maxY = positions.MaxBy(p => p.y).y;
var maxX = positions.MaxBy(p => p.x).x;
var height = (maxY - minY) + 1;
var width = (maxX - minX) + 1;
var area = height * width;
var emptyGround = area - positions.Count;
return emptyGround;
}
internal override string Part1()
{
HashSet<ivec2> positions = new(elves);
PlayOut(positions, 10);
var emptyGround = GetEmptySpots(positions);
return $"Empty ground spaces after 10 rounds: <+white>{emptyGround}";
}
internal override string Part2()
{
HashSet<ivec2> positions = new(elves);
var round = PlayOut(positions);
return $"Rounds to settle: <+white>{round}";
}
}

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src/Util/Vec2.cs
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return this + dir; return this + dir;
} }
public IEnumerable<ivec2> GetOrthogonalNeighbors()
{
foreach (var dir in FOURWAY)
{
yield return this + dir;
}
}
public IEnumerable<ivec2> GetNeighbors()
{
foreach (var dir in EIGHTWAY)
{
yield return this + dir;
}
}
public long this[long i] => (i == 0) ? x : y; public long this[long i] => (i == 0) ? x : y;
public static ivec2 operator +(ivec2 v) => v; public static ivec2 operator +(ivec2 v) => v;