Create most-frequent-even-element.py

Author: kamyu104

Python/most-frequent-even-element.py

@@ -0,0 +1,15 @@
+# Time:  O(n)
+# Space: O(n)
+
+import collections
+
+
+# freq table
+class Solution(object):
+    def mostFrequentEven(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        cnt = collections.Counter(x for x in nums if x%2 == 0)
+        return max(cnt.iterkeys(), key=lambda x: (cnt[x], -x)) if cnt else -1