feat: add swift implementation to lcof2 problem: No.032 (doocs#3037)

Author: klever34

lcof2/剑指 Offer II 032. 有效的变位词/README.md

@@ -170,6 +170,35 @@ function isAnagram(s: string, t: string): boolean {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func isAnagram(_ s: String, _ t: String) -> Bool {
+        let m = s.count
+        let n = t.count
+        if m != n || s == t {
+            return false
+        }
+        
+        var cnt = [Int](repeating: 0, count: 26)
+        
+        for (sc, tc) in zip(s, t) {
+            cnt[Int(sc.asciiValue! - Character("a").asciiValue!)] += 1
+            cnt[Int(tc.asciiValue! - Character("a").asciiValue!)] -= 1
+        }
+        
+        for x in cnt {
+            if x != 0 {
+                return false
+            }
+        }
+        
+        return true
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcof2/剑指 Offer II 032. 有效的变位词/Solution.swift

@@ -0,0 +1,24 @@
+class Solution {
+    func isAnagram(_ s: String, _ t: String) -> Bool {
+        let m = s.count
+        let n = t.count
+        if m != n || s == t {
+            return false
+        }
+        
+        var cnt = [Int](repeating: 0, count: 26)
+        
+        for (sc, tc) in zip(s, t) {
+            cnt[Int(sc.asciiValue! - Character("a").asciiValue!)] += 1
+            cnt[Int(tc.asciiValue! - Character("a").asciiValue!)] -= 1
+        }
+        
+        for x in cnt {
+            if x != 0 {
+                return false
+            }
+        }
+        
+        return true
+    }
+}