2024 - Day 06 - part 2 now using parallelStream to speed up.

fmmr · Dec 6, 2024 · af98fde · af98fde
1 parent c8a085c
commit af98fde
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Showing 2 changed files with 8 additions and 5 deletions.
diff --git a/src/main/kotlin/no/rodland/advent_2024/Day06.kt b/src/main/kotlin/no/rodland/advent_2024/Day06.kt
@@ -19,9 +19,13 @@ class Day06(val input: List<String>) : Day<Int, Int, Pair<Pos, Array<CharArray>>
 
     override fun partTwo(): Int {
         val obstructions = doTheWalk()!!.map { it.first }.toSet() - start
-        return obstructions.map { check ->
-            doTheWalk { g: Grid, p: Pos -> if (p == check) '#' else g[p] }
-        }.count { it == null }
+        return obstructions
+            .parallelStream()
+            .map { check ->
+                doTheWalk { g: Grid, p: Pos -> if (p == check) '#' else g[p] }
+            }
+            .filter { it == null }
+            .count().toInt()
     }
 
     private fun doTheWalk(getter: (g: Grid, p: Pos) -> Char = { g, p -> g[p] }): MutableSet<Pair<Pos, Direction>>? {

diff --git a/src/test/kotlin/no/rodland/advent_2024/Day06Test.kt b/src/test/kotlin/no/rodland/advent_2024/Day06Test.kt
@@ -29,6 +29,7 @@ internal class Day06Test {
         resultTwo,
         { Day06(data06) },
         { Day06(test06) },
+        numTestPart1 = 10,
         numTestPart2 = 1
     )
 
@@ -63,7 +64,6 @@ internal class Day06Test {
         }
 
         @Test
-        @Slow(520)
         fun `06,1,live,1`() {
             report(test.livePart1)
         }
@@ -77,7 +77,6 @@ internal class Day06Test {
         }
 
         @Test
-        @Slow(1200)
         fun `06,2,live,1`() {
             report(test.livePart2)
         }