Updated MST to Swift 4.2

Author: inickt

Minimum Spanning Tree/MinimumSpanningTree.playground/Contents.swift

@@ -3,11 +3,6 @@
  Kruskal's and Prim's algorithms.
  */
 
-// last checked with Xcode 9.0b4
-#if swift(>=4.0)
-print("Hello, Swift 4!")
-#endif
-
 func minimumSpanningTreeKruskal<T>(graph: Graph<T>) -> (cost: Int, tree: Graph<T>) {
     var cost: Int = 0
     var tree = Graph<T>()

Minimum Spanning Tree/MinimumSpanningTree.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>