diff --git a/problems/0239.滑动窗口最大值.md b/problems/0239.滑动窗口最大值.md
index d9788f63..d7a94b5a 100644
--- a/problems/0239.滑动窗口最大值.md
+++ b/problems/0239.滑动窗口最大值.md
@@ -45,7 +45,7 @@
 
 这个队列应该长这个样子：
 
-```
+```cpp
 class MyQueue {
 public:
     void pop(int value) {
@@ -525,5 +525,39 @@ class Solution {
 }
 ```
 
+Swift解法二：
+
+```swift
+func maxSlidingWindow(_ nums: [Int], _ k: Int) -> [Int] {
+    var result = [Int]()
+    var window = [Int]()
+    var right = 0, left = right - k + 1
+
+    while right < nums.count {
+        let value = nums[right]
+
+        // 因为窗口移动丢弃的左边数
+        if left > 0, left - 1 == window.first {
+            window.removeFirst()
+        }
+
+        // 保证末尾的是最大的
+        while !window.isEmpty, value > nums[window.last!] {
+            window.removeLast()
+        }
+        window.append(right)
+
+        if left >= 0 { // 窗口形成
+            result.append(nums[window.first!])
+        }
+
+        right += 1
+        left += 1
+    }
+
+    return result
+}
+```
+
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 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>