feat: add swift implementation to lcof2 problem: No.033 (#3038)

Author: klever34

lcof2/剑指 Offer II 033. 变位词组/README.md

@@ -158,6 +158,26 @@ function groupAnagrams(strs: string[]): string[][] {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func groupAnagrams(_ strs: [String]) -> [[String]] {
+        var d = [String: [String]]()
+        
+        for s in strs {
+            let sortedStr = String(s.sorted())
+            if d[sortedStr] == nil {
+                d[sortedStr] = [String]()
+            }
+            d[sortedStr]!.append(s)
+        }
+        
+        return Array(d.values)
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcof2/剑指 Offer II 033. 变位词组/Solution.swift

@@ -0,0 +1,15 @@
+class Solution {
+    func groupAnagrams(_ strs: [String]) -> [[String]] {
+        var d = [String: [String]]()
+        
+        for s in strs {
+            let sortedStr = String(s.sorted())
+            if d[sortedStr] == nil {
+                d[sortedStr] = [String]()
+            }
+            d[sortedStr]!.append(s)
+        }
+        
+        return Array(d.values)
+    }
+}