为数组篇 增加 Swift 实现

animation-simulation/数组篇/长度最小的子数组.md

@@ -106,3 +106,22 @@ class Solution:
             return windowlen
 ```
 
+Swift Code
+
+```swift
+class Solution {
+    func minSubArrayLen(_ target: Int, _ nums: [Int]) -> Int {
+
+        var sum = 0, windowlen = Int.max, i = 0
+        for j in 0..<nums.count {
+            sum += nums[j]
+            while sum >= target {
+                windowlen = min(windowlen, j - i + 1)
+                sum -= nums[i]
+                i += 1
+            }
+        }
+        return windowlen == Int.max ? 0 : windowlen
+    }
+}
+```