Added solutions

Author: adityaramkumar

169.py

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+# Runtime: 40 ms, faster than 54.99% of Python online submissions for Majority Element.
+# Difficulty: Easy
+
+class Solution(object):
+    def majorityElement(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        values = dict()
+        for num in nums:
+            values[num] = values.get(num, 0) + 1
+        return max(values, key=values.get)

182.sql

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+# Runtime: 185 ms, faster than 67.53% of MySQL online submissions for Duplicate Emails.
+# Difficulty: Easy
+
+select Email from Person group by Email having count(*) > 1;