Day10 2021

2021-12-10 19:49:36 +01:00
parent 20e2555470
commit 57f4a97627
3 changed files with 177 additions and 0 deletions
@@ -0,0 +1,61 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.BaseDay
+import be.vandewalleh.aoc.utils.input.Day
+
+@Day
+class Day10 : BaseDay() {
+    private val chunks = mapOf(
+        ')' to '(',
+        ']' to '[',
+        '>' to '<',
+        '}' to '{',
+    )
+
+    override fun part1(): Any {
+        val points = mapOf(
+            ')' to 3,
+            ']' to 57,
+            '}' to 1197,
+            '>' to 25137,
+        )
+        return input.lines.value.sumOf { line ->
+            val stack = mutableListOf<Char>()
+            for (char in line) {
+                if (char in chunks) {
+                    if (stack.last() == chunks[char]!!) stack.removeLast()
+                    else return@sumOf points[char]!!
+                } else {
+                    stack.add(char)
+                }
+            }
+            0
+        }
+    }
+
+    override fun part2(): Any {
+        val points = mapOf(
+            '(' to 1,
+            '[' to 2,
+            '{' to 3,
+            '<' to 4,
+        )
+        return input.lines.value.mapNotNull { line ->
+            val stack = mutableListOf<Char>()
+            for (char in line) {
+                if (char in chunks) {
+                    if (stack.last() == chunks[char]!!) stack.removeLast()
+                    else return@mapNotNull null
+                } else {
+                    stack.add(char)
+                }
+            }
+            var score = 0L
+            stack.asReversed().forEach {
+                score *= 5
+                score += points[it]!!
+            }
+            score
+        }.sorted().let { it[it.size / 2] }
+    }
+}
@@ -0,0 +1,94 @@
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+{{[[(<[[[<[<<{()()}(<>{})>[<<><>>[[]]]>[{{[]<>}[[]]}<<[]{}>[<>[]]>]]([[[{}<>]]<<()[]>{()<>}>]([<<
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