updated to scala 2.13

Author: huiwang

build.sbt

@@ -1,6 +1,6 @@
 name := "CodinGame-Scala-Kit"
 version := "0.1.0"
-scalaVersion := "2.12.4"
+scalaVersion := "2.13.1"
 
 // solve a weird issue with java dependencies (trait Approving)
 // see https://stackoverflow.com/questions/43751394/package-cats-contains-object-and-package-with-same-name-implicits &
@@ -10,11 +10,9 @@ scalacOptions := Seq("-Yresolve-term-conflict:object")
 
 resolvers += Resolver.mavenLocal
 
-libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.1" % "test"
+libraryDependencies += "org.scalatest" %% "scalatest" % "3.1.2" % "test"
 libraryDependencies += "com.github.writethemfirst" % "approvals-java" % "0.4" % "test"
-libraryDependencies += "org.scala-lang" % "scala-compiler" % "2.12.4" % "test"
-libraryDependencies += "com.geirsson" %% "scalafmt-core" % "1.3.0"
-libraryDependencies += "com.geirsson" %% "scalafmt-cli" % "1.3.0"
+libraryDependencies += "org.scala-lang" % "scala-compiler" % "2.13.1" % "test"
 
 enablePlugins(JmhPlugin)
 enablePlugins(JavaAppPackaging)

src/main/scala/com/truelaurel/algorithm/graph/BreathFirstShortestPathFinder.scala

@@ -9,7 +9,7 @@ class BreathFirstShortestPathFinder[T](graph: Map[T, Vector[T]], obstacles: Set[
   }
 
   def findPaths(source: T, targets: Set[T]): Paths = {
-    path(targets, Map(source -> Vector.empty), Set.empty, Map.empty).mapValues(_.reverse)
+    path(targets, Map(source -> Vector.empty), Set.empty, Map.empty).mapValues(_.reverse).toMap
   }
 
   private def path(targets: Set[T], paths: Paths, visited: Set[T], found: Paths): Paths = {

src/main/scala/com/truelaurel/algorithm/graph/FloydWarshall.scala

@@ -41,9 +41,9 @@ object ShortestPath {
     }
 
     // Extract paths.
-    val itenearies = mutable.Map[Int, Map[Int, Seq[Int]]]()
+    val itenearies = mutable.Map[Int, Map[Int, ArrayBuffer[Int]]]()
     for (i <- 0 until n) {
-      val ps = mutable.Map[Int, Seq[Int]]()
+      val ps = mutable.Map[Int, ArrayBuffer[Int]]()
       for (j <- 0 until n)
         if (ds(i)(j) != inf) {
           val p = new ArrayBuffer[Int]()

src/main/scala/com/truelaurel/codingame/tool/bundle/Bundler.scala

@@ -9,8 +9,7 @@ case class Bundler(fileName: String, io: BundlerIo) {
 
   def bundle(): Unit = {
     val outputFileContent = buildOutput
-    val formattedOutputFileContent = org.scalafmt.Scalafmt.format(outputFileContent).get
-    io.save(fileName, formattedOutputFileContent)
+    io.save(fileName, outputFileContent)
   }
 
   def buildOutput: String = {