diff --git a/1/distance.scala b/1/distance.scala
index c1b5314..af9531b 100644
--- a/1/distance.scala
+++ b/1/distance.scala
@@ -22,4 +22,4 @@ def totalDistance(l1: List[Int], l2: List[Int]): Int =
   val s1 = l1.sorted
   val s2 = l2.sorted
 
-  s1.zip(s2).map((a, b) => (a - b).abs).reduceRight(_ + _)
+  s1.zip(s2).map((a, b) => (a - b).abs).sum
diff --git a/10/distinct_hiking_trails.scala b/10/distinct_hiking_trails.scala
index 3d13dd1..776ce19 100644
--- a/10/distinct_hiking_trails.scala
+++ b/10/distinct_hiking_trails.scala
@@ -53,7 +53,7 @@ def trailheadsTotalScore(map: Height2DMap): Int =
   yield
     findHeightCoords(map, Coord(row, col)).length
 
-  scores.reduceRight(_ + _)
+  scores.sum
 
 def findHeightCoords(
   map: Height2DMap, startCoord: Coord, searchHeight: Int = 9
diff --git a/10/hiking_trails.scala b/10/hiking_trails.scala
index 05736f0..aa29977 100644
--- a/10/hiking_trails.scala
+++ b/10/hiking_trails.scala
@@ -74,7 +74,7 @@ def trailheadsTotalScore(map: Height2DMap): Int =
   yield
     findHeightCoords(Visitable2DMap(map), Coord(row, col)).length
 
-  scores.reduceRight(_ + _)
+  scores.sum
 
 def findHeightCoords(
   map: Visitable2DMap, startCoord: Coord, searchHeight: Int = 9
diff --git a/12/discounted_fence.scala b/12/discounted_fence.scala
index 3293960..ba57495 100644
--- a/12/discounted_fence.scala
+++ b/12/discounted_fence.scala
@@ -12,7 +12,7 @@ def main2(inputFileName: String): Unit =
 
   val map = Char2DMatrix(lines.toVector)
 
-  println(formPlots(map).map(plotFencePrice(map, _)).reduceRight(_ + _))
+  println(formPlots(map).map(plotFencePrice(map, _)).sum)
 
 case class Coord(row: Int, col: Int)
 
diff --git a/12/garden_groups.scala b/12/garden_groups.scala
index 21a391e..5639b9e 100644
--- a/12/garden_groups.scala
+++ b/12/garden_groups.scala
@@ -12,7 +12,7 @@ def main2(inputFileName: String): Unit =
 
   val map = Char2DMatrix(lines.toVector)
 
-  println(formPlots(map).map(plotFencePrice(map, _)).reduceRight(_ + _))
+  println(formPlots(map).map(plotFencePrice(map, _)).sum)
 
 case class Coord(row: Int, col: Int)
 
@@ -122,4 +122,4 @@ def plotPerimeter(map: Char2DMatrix, plot: List[Coord]): Int =
         case Some(outerIdentifier) => outerIdentifier != identifier
         case None => true
     )
-  ).reduceRight(_ + _)
+  ).sum