添加 1. 两数之和 Swift版本

problems/0001.两数之和.md

@@ -206,6 +206,23 @@ function twoSum(array $nums, int $target): array
 }
 ```
 
+Swift：
+```swift
+func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
+    var res = [Int]()
+    var dict = [Int : Int]()
+    for i in 0 ..< nums.count {
+        let other = target - nums[i]
+        if dict.keys.contains(other) {
+            res.append(i)
+            res.append(dict[other]!)
+            return res
+        }
+        dict[nums[i]] = i
+    }
+    return res
+}
+```
 
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 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)