Merge pull request youngyangyang04#673 from qxuewei/master

添加 349. 两个数组的交集 Swift版本

Author: youngyangyang04

problems/0349.两个数组的交集.md

@@ -192,6 +192,22 @@ var intersection = function(nums1, nums2) {
 };
 ```
 
+Swift：
+```swift
+func intersection(_ nums1: [Int], _ nums2: [Int]) -> [Int] {
+    var set1 = Set<Int>()
+    var set2 = Set<Int>()
+    for num in nums1 {
+        set1.insert(num)
+    }
+    for num in nums2 {
+        if set1.contains(num) {
+            set2.insert(num)
+        }
+    }
+    return Array(set2)
+}
+```
 
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