Complete day 2

1 files changed, 51 insertions, 0 deletions

diff --git a/src/Day02.kt b/src/Day02.kt
new file mode 100644
index 0000000..dd3992b
--- /dev/null
+++ b/src/Day02.kt
@@ -0,0 +1,51 @@
+fun main() {
+    fun part1(input: List<String>): Int {
+        var horizontal = 0
+        var depth = 0
+
+        for (line in input) {
+            val parts = line.split(" ")
+            val commandName = parts[0]
+            val argument = parts[1].toInt()
+
+            when (commandName) {
+                "forward" -> horizontal += argument
+                "down" -> depth += argument
+                "up" -> depth -= argument
+            }
+        }
+
+        return horizontal * depth
+    }
+
+    fun part2(input: List<String>): Int {
+        var horizontal = 0
+        var depth = 0
+        var aim = 0
+
+        for (line in input) {
+            val parts = line.split(" ")
+            val commandName = parts[0]
+            val argument = parts[1].toInt()
+
+            when (commandName) {
+                "forward" -> {
+                    horizontal += argument
+                    depth += aim * argument
+                }
+                "down" -> aim += argument
+                "up" -> aim -= argument
+            }
+        }
+
+        return horizontal * depth
+    }
+
+    val testInput = readInput("Day02_test")
+    check(part1(testInput) == 150)
+    check(part2(testInput) == 900)
+
+    val input = readInput("Day02")
+    println(part1(input))
+    println(part2(input))
+}