From b9a8e7585bf931a3fac29acb665f9dc39ac95ae9 Mon Sep 17 00:00:00 2001
From: Hubert Van De Walle <hubv@protonmail.com>
Date: Thu, 2 Dec 2021 09:08:06 +0100
Subject: [PATCH] Day02 2021

---
 2021/src/main/kotlin/Day02.kt     |   40 ++
 2021/src/main/resources/day02.txt | 1000 +++++++++++++++++++++++++++++
 2021/src/test/kotlin/Day02Test.kt |   18 +
 3 files changed, 1058 insertions(+)
 create mode 100644 2021/src/main/kotlin/Day02.kt
 create mode 100644 2021/src/main/resources/day02.txt
 create mode 100644 2021/src/test/kotlin/Day02Test.kt

diff --git a/2021/src/main/kotlin/Day02.kt b/2021/src/main/kotlin/Day02.kt
new file mode 100644
index 0000000..12b1e21
--- /dev/null
+++ b/2021/src/main/kotlin/Day02.kt
@@ -0,0 +1,40 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Text
+
+@Day
+class Day02(@Text input: String) {
+    private val lines = input.lines().map { it.split(' ').let { it[0] to it[1].toInt() } }
+
+    fun part1(): Any {
+        var horizontalPosition = 0
+        var depth = 0
+        lines.forEach { (direction, value) ->
+                when (direction) {
+                    "forward" -> horizontalPosition += value
+                    "down" -> depth += value
+                    "up" -> depth -= value
+                }
+            }
+        return horizontalPosition * depth
+    }
+
+    fun part2(): Any {
+        var horizontalPosition = 0
+        var depth = 0
+        var aim = 0
+        lines.forEach { (direction, value) ->
+                when (direction) {
+                    "forward" -> {
+                        horizontalPosition += value
+                        depth += aim * value
+                    }
+                    "down" -> aim += value
+                    "up" -> aim -= value
+                }
+            }
+        return horizontalPosition * depth
+    }
+
+}
diff --git a/2021/src/main/resources/day02.txt b/2021/src/main/resources/day02.txt
new file mode 100644
index 0000000..bd4d307
--- /dev/null
+++ b/2021/src/main/resources/day02.txt
@@ -0,0 +1,1000 @@
+forward 2
+down 4
+down 3
+up 4
+down 1
+down 8
+up 9
+forward 1
+down 9
+forward 6
+down 7
+forward 1
+down 1
+up 2
+forward 8
+down 3
+down 9
+down 3
+down 8
+forward 3
+forward 5
+up 8
+forward 6
+forward 5
+forward 6
+forward 4
+up 3
+forward 1
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+forward 2
+up 2
+up 2
+down 6
+forward 3
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+forward 1
+down 1
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+up 7
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+down 5
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+up 4
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+down 1
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diff --git a/2021/src/test/kotlin/Day02Test.kt b/2021/src/test/kotlin/Day02Test.kt
new file mode 100644
index 0000000..9059440
--- /dev/null
+++ b/2021/src/test/kotlin/Day02Test.kt
@@ -0,0 +1,18 @@
+package be.vandewalleh.aoc.days
+
+class Day02Test : BaseDayTest(2) {
+    override val example = """
+        forward 5
+        down 5
+        forward 8
+        up 3
+        down 8
+        forward 2
+    """.trimIndent()
+
+    override val part1Example = 150
+    override val part2Example = 900
+
+    override val part1Answer = 1938402
+    override val part2Answer = 1947878632
+}