Change playground as well.

Bucket Sort/BucketSort.playground/Sources/BucketSort.swift

@@ -20,31 +20,6 @@
 //
 //
 
-import Foundation
-// FIXME: comparison operators with optionals were removed from the Swift Standard Libary.
-// Consider refactoring the code to use the non-optional operators.
-fileprivate func < <T: Comparable>(lhs: T?, rhs: T?) -> Bool {
-    switch (lhs, rhs) {
-    case let (l?, r?):
-        return l < r
-    case (nil, _?):
-        return true
-    default:
-        return false
-    }
-}
-
-// FIXME: comparison operators with optionals were removed from the Swift Standard Libary.
-// Consider refactoring the code to use the non-optional operators.
-fileprivate func >= <T: Comparable>(lhs: T?, rhs: T?) -> Bool {
-    switch (lhs, rhs) {
-    case let (l?, r?):
-        return l >= r
-    default:
-        return !(lhs < rhs)
-    }
-}
-
 //////////////////////////////////////
 // MARK: Main algorithm
 //////////////////////////////////////
@@ -87,7 +62,11 @@ private func enoughSpaceInBuckets<T>(_ buckets: [Bucket<T>], elements: [T]) -> B
     let maximumValue = elements.max()?.toInt()
     let totalCapacity = buckets.count * (buckets.first?.capacity)!
 
-    return totalCapacity >= maximumValue
+    guard let max = maximumValue else {
+        return false
+    }
+
+    return totalCapacity >= max
 }
 
 //////////////////////////////////////

Bucket Sort/BucketSort.playground/contents.xcplayground

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='5.0' target-platform='ios'>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='false'>
     <timeline fileName='timeline.xctimeline'/>
 </playground>

Bucket Sort/BucketSort.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>