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Day 11

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I've got an off-by-one in ExpandGrid that only seems to affect expanding by more than one. I don't know what that is yet.
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Chris Pickett
2023-12-11 11:51:33 -06:00
parent 59637e4eff
commit bbf18aac9f
4 changed files with 258 additions and 0 deletions
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advent-of-code-2023.csproj
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<EmbeddedResource Include="inputs\09a.txt" /> <EmbeddedResource Include="inputs\09a.txt" />
<EmbeddedResource Include="inputs\10.txt" /> <EmbeddedResource Include="inputs\10.txt" />
<EmbeddedResource Include="inputs\10a.txt" /> <EmbeddedResource Include="inputs\10a.txt" />
<EmbeddedResource Include="inputs\11.txt" />
<EmbeddedResource Include="inputs\11a.txt" />
</ItemGroup> </ItemGroup>
<ItemGroup> <ItemGroup>

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using aoc2023.Util;
namespace aoc2023;
internal class Day11 : Day
{
private readonly List<ivec2> grid = new();
private int width;
private int height;
internal override void Parse()
{
var lines = Parsing.ReadAllLines($"{GetDay()}").ToList();
for (int row = 0; row < lines.Count; row++)
{
for (int col = 0; col < lines[row].Length; col++)
{
if (lines[row][col] == '#')
{
grid.Add(new ivec2(col, row));
}
width = col + 1;
}
height = row + 1;
}
}
List<ivec2> ExpandGrid(int expandBy)
{
List<ivec2> result = grid.ToList();
for (int row = 0; row < height; row++)
{
if (result.All(p => p.y != row))
{
var pointsToMove = result.Where(p => p.y > row).ToList();
result.RemoveAll(p => pointsToMove.Contains(p));
foreach (var pt in pointsToMove)
{
result.Add(new ivec2(pt.x, pt.y + expandBy));
}
row += expandBy;
height += expandBy;
}
}
for (int col = 0; col < width; col++)
{
if (result.All(p => p.x != col))
{
var pointsToMove = result.Where(p => p.x > col).ToList();
result.RemoveAll(p => pointsToMove.Contains(p));
foreach (var pt in pointsToMove)
{
result.Add(new ivec2(pt.x + expandBy, pt.y));
}
col += expandBy;
width += expandBy;
}
}
return result;
}
internal override string Part1()
{
List<ivec2> p1grid = ExpandGrid(1);
long total = 0;
while (p1grid.Count > 0)
{
var source = p1grid.First();
p1grid.Remove(source);
foreach (var pt in p1grid)
{
var dist = source.ManhattanDistanceTo(pt);
total += dist;
}
}
return $"<+white>{total}";
}
internal override string Part2()
{
// this should be 1 million, but that gives me a sort-of "off by one" problem that this solves. i don't know why yet.
List<ivec2> p2grid = ExpandGrid(999999);
long total = 0;
while (p2grid.Count > 0)
{
var source = p2grid.First();
p2grid.Remove(source);
foreach (var pt in p2grid)
{
var dist = source.ManhattanDistanceTo(pt);
total += dist;
}
}
return $"<+white>{total}";
}
}