Add solution for leetcode topKFrequent

Author: wisdom08

top-k-frequent-elements/wisdom08.py

@@ -0,0 +1,10 @@
+def topKFrequent(nums, k):
+    frequency = {}
+    for num in nums:
+        frequency[num] = frequency.get(num, 0) + 1
+
+    sorted_frequency = sorted(frequency, key=lambda num: frequency[num])
+    return sorted_frequency[-k:]
+
+
+print(topKFrequent([1, 1, 1, 2, 2, 3], 2))