feat: add swift implementation to lcof2 problem: No.063 (#3132)

Author: klever34

lcof2/剑指 Offer II 063. 替换单词/README.md

@@ -172,6 +172,30 @@ func replaceWords(dictionary []string, sentence string) string {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func replaceWords(_ dictionary: [String], _ sentence: String) -> String {
+        let dictSet = Set(dictionary)
+        var words = sentence.split(separator: " ").map { String($0) }
+
+        for i in 0..<words.count {
+            let word = words[i]
+            for j in 1...word.count {
+                let prefix = String(word.prefix(j))
+                if dictSet.contains(prefix) {
+                    words[i] = prefix
+                    break
+                }
+            }
+        }
+
+        return words.joined(separator: " ")
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcof2/剑指 Offer II 063. 替换单词/Solution.swift

@@ -0,0 +1,19 @@
+class Solution {
+    func replaceWords(_ dictionary: [String], _ sentence: String) -> String {
+        let dictSet = Set(dictionary)
+        var words = sentence.split(separator: " ").map { String($0) }
+
+        for i in 0..<words.count {
+            let word = words[i]
+            for j in 1...word.count {
+                let prefix = String(word.prefix(j))
+                if dictSet.contains(prefix) {
+                    words[i] = prefix
+                    break
+                }
+            }
+        }
+
+        return words.joined(separator: " ")
+    }
+}