feat: add swift solution to lcci problems: No.01.01,01.03 (#2564)

Author: klever34

lcci/01.01.Is Unique/README.md

@@ -128,6 +128,22 @@ var isUnique = function (astr) {
 };
 ```
 
+```swift
+class Solution {
+    func isUnique(_ astr: String) -> Bool {
+        var mask = 0
+        for c in astr {
+            let i = Int(c.asciiValue! - Character("a").asciiValue!)
+            if (mask >> i) & 1 != 0 {
+                return false
+            }
+            mask |= 1 << i
+        }
+        return true
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

lcci/01.01.Is Unique/README_EN.md

@@ -135,6 +135,22 @@ var isUnique = function (astr) {
 };
 ```
 
+```swift
+class Solution {
+    func isUnique(_ astr: String) -> Bool {
+        var mask = 0
+        for c in astr {
+            let i = Int(c.asciiValue! - Character("a").asciiValue!)
+            if (mask >> i) & 1 != 0 {
+                return false
+            }
+            mask |= 1 << i
+        }
+        return true
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

lcci/01.01.Is Unique/Solution.swift

@@ -0,0 +1,13 @@
+class Solution {
+    func isUnique(_ astr: String) -> Bool {
+        var mask = 0
+        for c in astr {
+            let i = Int(c.asciiValue! - Character("a").asciiValue!)
+            if (mask >> i) & 1 != 0 {
+                return false
+            }
+            mask |= 1 << i
+        }
+        return true
+    }
+}

lcci/01.03.String to URL/README.md

@@ -66,6 +66,25 @@ var replaceSpaces = function (S, length) {
 };
 ```
 
+```swift
+class Solution {
+    func replaceSpaces(_ S: String, _ length: Int) -> String {
+        let substring = S.prefix(length)
+        var result = ""
+
+        for character in substring {
+            if character == " " {
+                result += "%20"
+            } else {
+                result.append(character)
+            }
+        }
+
+        return result
+    }
+}
+```
+
 <!-- tabs:end -->
 
 ### 方法二：模拟

lcci/01.03.String to URL/README_EN.md

@@ -79,6 +79,25 @@ var replaceSpaces = function (S, length) {
 };
 ```
 
+```swift
+class Solution {
+    func replaceSpaces(_ S: String, _ length: Int) -> String {
+        let substring = S.prefix(length)
+        var result = ""
+
+        for character in substring {
+            if character == " " {
+                result += "%20"
+            } else {
+                result.append(character)
+            }
+        }
+
+        return result
+    }
+}
+```
+
 <!-- tabs:end -->
 
 ### Solution 2: Simulation

lcci/01.03.String to URL/Solution.swift

@@ -0,0 +1,16 @@
+class Solution {
+    func replaceSpaces(_ S: String, _ length: Int) -> String {
+        let substring = S.prefix(length)
+        var result = ""
+        
+        for character in substring {
+            if character == " " {
+                result += "%20"
+            } else {
+                result.append(character)
+            }
+        }
+        
+        return result
+    }
+}