🎉 feat: initial commit for leetcode 347 using Swift

Author: liuchuo

Swift/347. Top K Frequent Elements.swift

@@ -0,0 +1,10 @@
+// 347. Top K Frequent Elements
+// 48 ms, 68%
+func topKFrequent(_ nums: [Int], _ k: Int) -> [Int] {
+    var dict = [Int:Int]()
+    nums.forEach {
+        dict[$0] = (dict[$0] == nil ? 0 : dict[$0]! ) + 1
+    }
+
+    return dict.sorted(by:  { $0.value > $1.value } )[0..<k].map({$0.key})
+}