Day09 - Part 1

Author: ath0s

src/main/kotlin/Day09.kt

@@ -0,0 +1,49 @@
+import kotlin.io.path.readLines
+
+class Day09 : Day {
+    override fun partOne(filename: String, verbose: Boolean): Long {
+        val redTiles = filename.asPath().readLines().map {
+            val (x, y) = it.split(",")
+            Coordinate(x.toInt(), y.toInt())
+        }
+        if (verbose) {
+            val minX = redTiles.minOf { it.x }
+            val maxX = redTiles.maxOf { it.x }
+            val minY = redTiles.minOf { it.y }
+            val maxY = redTiles.maxOf { it.y }
+
+            (minY..maxY).forEach { y ->
+                (minX..maxX).forEach { x ->
+                    if (Coordinate(x, y) in redTiles) {
+                        print('#')
+                    } else {
+                        print('.')
+                    }
+                }
+                println()
+            }
+        }
+        var largestRectangle = 0L
+
+        redTiles.forEachIndexed { index, firstTile ->
+            redTiles.drop(index + 1).forEach { secondTile ->
+                val ySize = maxOf(firstTile.y, secondTile.y) - minOf(firstTile.y, secondTile.y) + 1
+                val xSize = maxOf(firstTile.x, secondTile.x) - minOf(firstTile.x, secondTile.x) + 1
+                val size = ySize.toLong() * xSize.toLong()
+                if (size > largestRectangle) {
+                    largestRectangle = size
+                }
+            }
+        }
+        return largestRectangle
+    }
+
+    override fun partTwo(filename: String, verbose: Boolean): Any {
+        TODO("Not yet implemented")
+    }
+
+    companion object : Day.Main("Day09.txt") {
+        @JvmStatic
+        fun main(args: Array<String>) = main()
+    }
+}