feat: add swift implementation to lcof2 problem: No.089 (#3475)

Author: klever34

lcof2/剑指 Offer II 089. 房屋偷盗/README.md

@@ -168,6 +168,27 @@ impl Solution {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func rob(_ nums: [Int]) -> Int {
+        let n = nums.count
+        if n == 0 { return 0 }
+        if n == 1 { return nums[0] }
+
+        var f = Array(repeating: 0, count: n + 1)
+        f[1] = nums[0]
+
+        for i in 2...n {
+            f[i] = max(f[i - 1], f[i - 2] + nums[i - 1])
+        }
+
+        return f[n]
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcof2/剑指 Offer II 089. 房屋偷盗/Solution.swift

@@ -0,0 +1,16 @@
+class Solution {
+    func rob(_ nums: [Int]) -> Int {
+        let n = nums.count
+        if n == 0 { return 0 }
+        if n == 1 { return nums[0] }
+        
+        var f = Array(repeating: 0, count: n + 1)
+        f[1] = nums[0]
+        
+        for i in 2...n {
+            f[i] = max(f[i - 1], f[i - 2] + nums[i - 1])
+        }
+        
+        return f[n]
+    }
+}