添加0209.长度最小的子数组 Swfit版本

problems/0209.长度最小的子数组.md

@@ -216,6 +216,29 @@ var minSubArrayLen = function(target, nums) {
 };
 ```
 
+Swift:
+
+```swift
+func minSubArrayLen(_ target: Int, _ nums: [Int]) -> Int {
+    var result = Int.max
+    var sum = 0
+    var starIndex = 0
+    for endIndex in 0..<nums.count {
+        sum += nums[endIndex]
+
+        while sum >= target {
+            result = min(result, endIndex - starIndex + 1)
+            sum -= nums[starIndex]
+            starIndex += 1
+        }
+    }
+
+    return result == Int.max ? 0 : result
+}
+```
+
+
+
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