diff --git a/Day03_2/Day03_2.csproj b/Day03_2/Day03_2.csproj new file mode 100644 index 0000000..051c6b3 --- /dev/null +++ b/Day03_2/Day03_2.csproj @@ -0,0 +1,24 @@ + + + + Exe + net8.0 + enable + enable + + + + + + + + + PreserveNewest + + + + + + + + diff --git a/Day03_2/Program.cs b/Day03_2/Program.cs new file mode 100644 index 0000000..72914c4 --- /dev/null +++ b/Day03_2/Program.cs @@ -0,0 +1,85 @@ +using Tools; + +var input = InputTools.ReadAllLines(); + +var width = input[0].Length; +var height = input.Length; + +var map = new char[width, height]; +for (var x = 0; x < width; x++) +{ + for (var y = 0; y < height; y++) + { + map[x, y] = input[y][x]; + } +} + +var runningTotal = 0; +var currentNumber = 0; +var asterisks = new Dictionary>(); +var neighboringAsterisks = new HashSet(); + +for (var y = 0; y < height; y++) +{ + void EndCurrentNumber() + { + if (currentNumber != 0 && neighboringAsterisks.Count > 0) + { + foreach (var neighboringAsterisk in neighboringAsterisks) + { + var x = neighboringAsterisk.X; + var y = neighboringAsterisk.Y; + if (!asterisks.ContainsKey((x, y))) + { + asterisks[(x, y)] = []; + } + + asterisks[(x, y)].Add(currentNumber); + } + } + currentNumber = 0; + neighboringAsterisks.Clear(); + } + + for (var x = 0; x < height; x++) + { + var character = map[x, y]; + // check if we are reading a number + if (char.IsDigit(character)) + { + var value = character - '0'; + currentNumber = currentNumber * 10 + value; + foreach (var direction in Directions.WithDiagonals) + { + var neigbhorX = x + direction.X; + var neigbhorY = y + direction.Y; + if (neigbhorX < 0 || neigbhorX >= width || neigbhorY < 0 || neigbhorY >= height) + { + continue; + } + + var neighborCharacter = map[neigbhorX, neigbhorY]; + if (neighborCharacter == '*') + { + neighboringAsterisks.Add((neigbhorX, neigbhorY)); + } + } + } + else + { + EndCurrentNumber(); + } + } + + EndCurrentNumber(); +} + +foreach (var (point, numbers) in asterisks) +{ + if (numbers.Count == 2) + { + runningTotal += numbers[0] * numbers[1]; + } +} + +Console.WriteLine(runningTotal); \ No newline at end of file diff --git a/Day03_2/Properties/launchSettings.json b/Day03_2/Properties/launchSettings.json new file mode 100644 index 0000000..cbc783e --- /dev/null +++ b/Day03_2/Properties/launchSettings.json @@ -0,0 +1,8 @@ +{ + "profiles": { + "Run": { + "commandName": "Project", + "commandLineArgs": "< input.txt" + } + } +} \ No newline at end of file diff --git a/Day03_2/input.txt b/Day03_2/input.txt new file mode 100644 index 0000000..9b6a1a6 --- /dev/null +++ b/Day03_2/input.txt @@ -0,0 +1,140 @@ +..975..95..................717..........................................747................................................622.............. +................/47...........@....701...610.........252.660*.............*..236.....323..........108........653............................ 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