top k frequent elements solution

Author: yhkee0404

top-k-frequent-elements/yhkee0404.scala

@@ -0,0 +1,11 @@
+object Solution {
+    def topKFrequent(nums: Array[Int], k: Int): Array[Int] = {
+        return nums.groupBy(identity)
+                .view.mapValues(_.size)
+                .toSeq
+                .sortBy(- _._2)
+                .take(k)
+                .map(_._1)
+                .toArray
+    }
+}