Solve 2025 day 5 part 2

Author: sim642

src/main/scala/eu/sim642/adventofcode2025/Day5.scala

@@ -1,6 +1,6 @@
 package eu.sim642.adventofcode2025
 
-import eu.sim642.adventofcode2016.Day20.Interval
+import eu.sim642.adventofcode2016.Day20.{Interval, mergeIntervals}
 
 object Day5 {
 
@@ -11,6 +11,10 @@ object Day5 {
     available.count(id => fresh.exists(_.contains(id)))
   }
 
+  def countFresh(database: Database): Long = {
+    mergeIntervals(database.fresh).map(_.size).sum
+  }
+
   def parseInterval(s: String): Interval = s match {
     case s"$i-$j" => Interval(i.toLong, j.toLong)
   }
@@ -26,5 +30,6 @@ object Day5 {
 
   def main(args: Array[String]): Unit = {
     println(countFreshAvailable(parseDatabase(input)))
+    println(countFresh(parseDatabase(input)))
   }
 }

src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala

@@ -25,4 +25,12 @@ class Day5Test extends AnyFunSuite {
   test("Part 1 input answer") {
     assert(countFreshAvailable(parseDatabase(input)) == 679)
   }
+
+  test("Part 2 examples") {
+    assert(countFresh(parseDatabase(exampleInput)) == 14)
+  }
+
+  test("Part 2 input answer") {
+    assert(countFresh(parseDatabase(input)) == 358155203664116L)
+  }
 }