Move Code to Shared Location

Move some code that can be used in other parts to a shared location
GeistInDerSH · Dec 28, 2024 · 4b1a67d · 4b1a67d
1 parent b1a0b7f
commit 4b1a67d
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/src/main/kotlin/com/geistindersh/aoc/helper/iterators/List.kt b/src/main/kotlin/com/geistindersh/aoc/helper/iterators/List.kt
@@ -17,6 +17,12 @@ fun <T> Collection<T>.pairCombinations() =
         }
     }
 
+/**
+ * Generate all possible pairs of the given collection, including duplicates
+ * @return A List of Pairs of the items in the collection
+ */
+fun <T> Collection<T>.generatePairs() = this.flatMap { i -> this.map { j -> Pair(i, j) } }
+
 fun <T> List<T>.pairCombinationsNonInvertible() =
     sequence {
         val seen = mutableSetOf<Pair<T, T>>()

diff --git a/src/main/kotlin/com/geistindersh/aoc/year2024/Day21.kt b/src/main/kotlin/com/geistindersh/aoc/year2024/Day21.kt
@@ -4,6 +4,7 @@ import com.geistindersh.aoc.helper.enums.Direction
 import com.geistindersh.aoc.helper.enums.Point2D
 import com.geistindersh.aoc.helper.files.DataFile
 import com.geistindersh.aoc.helper.files.fileToStream
+import com.geistindersh.aoc.helper.iterators.generatePairs
 import com.geistindersh.aoc.helper.report
 import java.util.PriorityQueue
 import kotlin.collections.count
@@ -62,8 +63,6 @@ class Day21(
         private val NUMPAD_PATHS = NUMPAD.generatePaths()
         private val DIRECTION_PAD_PATHS = DIRECTION_PAD.generatePaths()
 
-        private fun <T> Collection<T>.generatePairs() = this.flatMap { start -> this.map { end -> start to end } }
-
         private fun Map<Point2D, Char>.generatePaths() =
             this.keys
                 .generatePairs()