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-rw-r--r--src/Day02.kt51
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))
+}