top k frequent elements

Author: delight010

top-k-frequent-elements/delight010.swift

@@ -0,0 +1,11 @@
+class Solution {
+    func topKFrequent(_ nums: [Int], _ k: Int) -> [Int] {
+        var dictionary: [Int: Int] = [:]
+        for num in nums {
+            dictionary[num, default: 0] += 1
+        }
+        
+        return dictionary.sorted(by: { $0.value > $1.value }).prefix(k).map(\.key)
+    }
+}
+