diff --git a/Data/2024_08.txt b/Data/2024_08.txt new file mode 100644 index 0000000..17d1fd1 --- /dev/null +++ b/Data/2024_08.txt @@ -0,0 +1,50 @@ +...........V..................b.g................. +..................................g............... +.............................c.................... +............T........Z.......P.................... +.x........................VP...................... +..........................PH...................... +.................H.....Z.......g.R................ +......f............T.V....b......A................ +......................P........................... +.......f..................A.............R......... +........x..............T.......l..H.....A.c....... +..k..x..............Z............................. +........5....S...............0.A.................. +.............N....L............................... +.f............................T........s.....N.... +..................l..........bH.......tc.R..N..... +......Z...6......n......l...k.N...0............... +...........g....S......l.r.................t..s... +..L................b.......K..t................... +................5....n........0.............c..... +.....L......n............................E........ +.k.......L................m.....................Es +..............St.....5....Rm...................... +............6..5...................3...0.......... +...........k.................W........3........... +................n......K...E....2S..........3..... +....................................E....Q........ +..........M.....x...............K................. +..h.............................1................. +.6............z..............4...e.........WY....y +........f............a.......Y..y...s............. +...h............r.............v....m.............. +.....h.................v....m.....Y.Q.....W3...... +.........................Yq....Q.................7 +.........6..............7.................9....... +...................X..........y..q.....2.......... +............r..............q.....y...........7.8.. +..B..............M....4............9.............. +...1.......M...X.......CGzp...4..B...2..K......... +.....................z...v....Q.....8...........9. +B.......X.F....rM...v...............2...8..D...... +h1..............................7..D.....8....d... +...............F.....................9D....4....d. +..........a......p............F.........W.D......d +.........................G..C...........q......... +...B..................................C........... +.........w..........z....p.....................e.. +.a............G....w........p........F........e... +........a...w..................................... +........w...............XC.......G................ diff --git a/Solutions/2024/Day08.cs b/Solutions/2024/Day08.cs new file mode 100644 index 0000000..a6f58a1 --- /dev/null +++ b/Solutions/2024/Day08.cs @@ -0,0 +1,67 @@ +using System.Reflection.Emit; + +namespace AdventOfCode.Solutions._2024; + +/// +/// Day 08: Resonant Collinearity +/// https://adventofcode.com/2024/day/08 +/// +[Description("Resonant Collinearity")] +public static partial class Day08 { + + private static char[,] _map = default!; + private static ILookup _antennae = default!; + + [Init] + public static void LoadMap(string[] input) + { + _map = input.To2dArray(); + _antennae = _map + .ForEachCell() + .Where(c => char.IsAsciiLetterOrDigit(c)) + .ToLookup(a => a.Value, a => a.Index); + } + + public static int Part1(string[] _, Action? visualise = null) + { + List antinodes = [.._antennae + .Select(a => _antennae[a.Key]) + .Select(locations => locations.Antinodes()) + .SelectMany(antinodes => antinodes) + .Distinct() + .Where(antinode => _map.IsInBounds(antinode))]; + + _map.VisualiseMap(antinodes, "Final", visualise); + return antinodes.Count; + } + + public static string Part2(string[] _) => NO_SOLUTION_WRITTEN_MESSAGE; + + private static IEnumerable Antinodes(this IEnumerable locations) + { + foreach (IEnumerable item in locations.Combinations(2)) { + Point a1 = item.First(); + Point a2 = item.Last(); + yield return a1 - a2 + a1; + yield return a2 - a1 + a2; + } + } + + + public static void VisualiseMap(this char[, ] map, IEnumerable antinodes, string title, Action? visualise) + { + char[,] copy = (char[,])map.Clone(); + + foreach (Point antinode in antinodes) { + copy[antinode.X, antinode.Y] = ANTINODE; + } + + if (visualise is not null) { + string[] output = ["", title, .. copy.PrintAsStringArray(0)]; + _ = Task.Run(() => visualise?.Invoke(output, false)); + } + } + + private const char EMPTY = '.'; + private const char ANTINODE = '#'; +} diff --git a/Tests/2024/Tests_08.cs b/Tests/2024/Tests_08.cs new file mode 100644 index 0000000..f02cea8 --- /dev/null +++ b/Tests/2024/Tests_08.cs @@ -0,0 +1,39 @@ +namespace AdventOfCode.Tests.Year2024; + +public class Tests_08_Resonant_Collinearity(ITestOutputHelper testOutputHelper) +{ + const int DAY = 08; + + private const string TEST_DATA = """ + ............ + ........0... + .....0...... + .......0.... + ....0....... + ......A..... + ............ + ............ + ........A... + .........A.. + ............ + ............ + """; + + [Theory] + [InlineData(TEST_DATA, 14)] + public void Part1(string input, int expected) + { + _ = int.TryParse(SolutionRouter.SolveProblem(YEAR, DAY, PART1, input, new Action(Callback)), out int actual); + actual.ShouldBe(expected); + } + + + private void Callback(string[] lines, bool _) + { + if (lines is null or []) { + return; + } + + testOutputHelper.WriteLine(string.Join(Environment.NewLine, lines)); + } +}