Prepare for other years

2020-12-30 18:01:52 +01:00
parent 522618d106
commit 4a90257257
81 changed files with 277 additions and 253 deletions
@@ -0,0 +1,43 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Input
+import be.vandewalleh.aoc.utils.input.Text
+
+private typealias Entry = Pair<String, String>
+private typealias Entries = List<Entry>
+
+@Day(4)
+class Day04(@Text val input: Input<String>) {
+
+    val entries = input.value.split("\n\n").map {
+        it.split(" ", "\n").map { it.split(":").let { (k, v) -> k to v } }
+    }
+
+    private fun Entries.hasRequiredKeys() = map { it.first }
+        .containsAll(listOf("byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"))
+
+    fun part1() = entries.count { it.hasRequiredKeys() }
+
+    private val hclRegex = Regex("#[0-9a-f]{6}")
+    private val pidRegex = Regex("[0-9]{9}")
+
+    private fun Entry.isValid() = let { (k, v) ->
+        when (k) {
+            "byr" -> v.toInt() in 1920..2002
+            "iyr" -> v.toInt() in 2010..2020
+            "eyr" -> v.toInt() in 2020..2030
+            "hgt" -> when {
+                v.endsWith("cm") -> v.removeSuffix("cm").toInt() in 150..193
+                v.endsWith("in") -> v.removeSuffix("in").toInt() in 59..76
+                else -> false
+            }
+            "hcl" -> v.matches(hclRegex)
+            "ecl" -> v in arrayOf("amb", "blu", "brn", "gry", "grn", "hzl", "oth")
+            "pid" -> v.matches(pidRegex)
+            else -> true
+        }
+    }
+
+    fun part2() = entries.count { it.hasRequiredKeys() && it.all { it.isValid() } }
+}