aoc2023 day 6+7

Author: Matsemann

adventofcode2023/src/main/kotlin/com/matsemann/adventofcode2023/Day06.kt

@@ -0,0 +1,36 @@
+package com.matsemann.adventofcode2023
+
+import com.matsemann.adventofcode2023.utils.*
+
+fun day06_1(lines: List<String>): Any {
+    return lines
+        .map {
+            it.allInts()
+        }
+        .transpose()
+        .map { (time, distance) ->
+            (0..time).count { holdTime ->
+                (time - holdTime) * holdTime > distance
+            }
+        }.product()
+}
+
+fun day06_2(lines: List<String>): Any {
+    return lines.map {
+        it.replace(" ", "").split(":")[1].toLong()
+    }.let { (time, distance) ->
+        (0L..time).count { holdTime ->
+            (time - holdTime) * holdTime > distance
+        }
+    }
+}
+
+fun main() {
+
+//    run("1", fileName = "day06_ex.txt", func = ::day06_1)
+    run("2", fileName = "day06_ex.txt", func = ::day06_2)
+
+
+//    run("1", fileName = "day06.txt", func = ::day06_1)
+    run("2", fileName = "day06.txt", func = ::day06_2)
+}

adventofcode2023/src/main/kotlin/com/matsemann/adventofcode2023/Day07.kt

@@ -0,0 +1,81 @@
+package com.matsemann.adventofcode2023
+
+import com.matsemann.adventofcode2023.utils.*
+
+fun day07_1(lines: List<String>): Any {
+    return lines.map { line ->
+        val parts = line.split(" ")
+        val cards = parts[0].toList().map {
+            when (it) {
+                'T' -> 'A'
+                'J' -> 'B'
+                'Q' -> 'C'
+                'K' -> 'D'
+                'A' -> 'E'
+                else -> it
+            }
+        }
+        cards to parts[1].toInt()
+    }
+        .sortedWith(compareBy({ (hand, _) ->
+            val pairs = hand.groupBy { it }.values.map { it.size }.sortedDescending()
+
+            when {
+                pairs[0] == 5 -> 7
+                pairs[0] == 4 -> 6
+                pairs[0] == 3 && pairs[1] == 2 -> 5
+                pairs[0] == 3 -> 4
+                pairs[0] == 2 && pairs[1] == 2 -> 3
+                pairs[0] == 2 -> 2
+                else -> 1
+            }
+        }, { (hand, _) -> hand.toString() }))
+        .mapIndexed { i, (cards, bet) ->
+            bet * (i + 1)
+        }.sum()
+}
+
+
+fun day07_2(lines: List<String>): Any {
+    return lines.map { line ->
+        val parts = line.split(" ")
+        val cards = parts[0].toList().map {
+            when (it) {
+                'T' -> 'A'
+                'J' -> '0'
+                'Q' -> 'C'
+                'K' -> 'D'
+                'A' -> 'E'
+                else -> it
+            }
+        }
+        cards to parts[1].toInt()
+    }
+        .sortedWith(compareBy({ (hand, _) ->
+            val jokers = hand.count { it == '0' }
+            val pairs = hand.filter { it != '0' }.groupBy { it }.values.map { it.size }.sortedDescending()
+
+            when {
+                jokers == 5 || pairs[0] + jokers == 5 -> 7
+                pairs[0] + jokers == 4 -> 6
+                pairs[0] + jokers == 3 && pairs[1] == 2 -> 5
+                pairs[0] + jokers == 3 -> 4
+                pairs[0] + jokers == 2 && pairs[1] == 2 -> 3
+                pairs[0] + jokers == 2 -> 2
+                else -> 1
+            }
+        }, { (hand, _) -> hand.toString() }))
+        .mapIndexed { i, (cards, bet) ->
+            bet * (i + 1)
+        }.sum()
+}
+
+fun main() {
+
+//    run("1", fileName = "day07_ex.txt", func = ::day07_1)
+    run("2", fileName = "day07_ex.txt", func = ::day07_2)
+
+// 249620106
+//    run("1", fileName = "day07.txt", func = ::day07_1)
+    run("2", fileName = "day07.txt", func = ::day07_2)
+}