start day 20 part2, not working yet
continuous-integration/drone/push Build is failing
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continuous-integration/drone/push Build is failing
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@ -41,6 +41,78 @@ namespace aoc2020
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!_allPermutations.Any(t2 => t.TileId != t2.TileId && t.TopId == t2.BottomId))
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!_allPermutations.Any(t2 => t.TileId != t2.TileId && t.TopId == t2.BottomId))
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.ToList();
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.ToList();
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}
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}
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private int Roughness(Tile arg)
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{
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var seaMonster = new[]
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{
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" # ",
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"# ## ## ###",
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" # # # # # # "
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}.Select(s => s.ToArray()).ToArray();
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const int seaMonsterWidth = 20;
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const int seaMonsterHeight = 3;
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const int seaMonsterTiles = 15;
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var placedTiles = new Dictionary<(int x, int y), Tile>();
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bool NotPlaced(Tile tile) => placedTiles!.Values.All(t => t.TileId != tile.TileId);
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char Grid(int i, int j) => placedTiles![(i / 8, j / 8)].Pixels[j % 8 + 1][i % 8 + 1];
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bool HasSeaMonster((int x, int y) location)
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{
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for (var j = 0; j < seaMonsterHeight; j++)
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for (var i = 0; i < seaMonsterWidth; i++)
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{
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if (seaMonster![j][i] == ' ') continue;
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if (Grid(location.x + i, location.y + j) != '#') return false;
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}
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return true;
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}
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placedTiles[(0, 0)] = arg;
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int x = 1, y = 0;
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while (true)
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{
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placedTiles.TryGetValue((x - 1, y), out var left);
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placedTiles.TryGetValue((x, y - 1), out var top);
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if (left == null && top == null) break;
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var firstMatch = _allPermutations
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.Where(t => (left is null || t.LeftId == left.RightId) &&
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(top is null || t.TopId == top.BottomId))
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.Where(NotPlaced)
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.FirstOrDefault();
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if (firstMatch is not null)
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{
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placedTiles[(x, y)] = firstMatch;
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x++;
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}
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else
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{
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x = 0;
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y++;
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}
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}
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var gridWidth = placedTiles.Keys.Max(t => t.x) + 1;
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var gridHeight = placedTiles.Keys.Max(t => t.y) + 1;
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var seaMonsterCount = Enumerable.Range(0, gridWidth * 8 - seaMonsterWidth)
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.SelectMany(_ => Enumerable.Range(0, gridHeight * 8 - seaMonsterHeight), (i, j) => (i, j))
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.Count(HasSeaMonster);
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if (seaMonsterCount == 0) return 0;
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var roughness = 0;
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for (var j = 0; j < gridHeight; j++)
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for (var i = 0; i < gridWidth; i++)
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if (Grid(x, y) == '#')
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roughness++;
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return roughness - seaMonsterCount * seaMonsterTiles;
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}
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}
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public override string Part1()
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public override string Part1()
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@ -50,7 +122,7 @@ namespace aoc2020
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public override string Part2()
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public override string Part2()
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{
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{
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return "";
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return $"{_topLefts.Select(Roughness).First(r => r > 0)}";
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}
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}
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private record Tile(int TileId, char[][] Pixels)
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private record Tile(int TileId, char[][] Pixels)
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