Create find-lucky-integer-in-an-array.py

Author: kamyu104

Python/find-lucky-integer-in-an-array.py

@@ -0,0 +1,18 @@
+# Time:  O(n)
+# Space: O(n)
+
+import collections
+
+
+class Solution(object):
+    def findLucky(self, arr):
+        """
+        :type arr: List[int]
+        :rtype: int
+        """
+        count = collections.Counter(arr)
+        result = -1
+        for k, v in count.iteritems():
+            if k == v:
+                result = max(result, k)
+        return result