class Solution(object):
    def repeatedNTimes(self, A):
        """
        :type A: List[int]
        :rtype: int
        """
        myset = set()

        for num in A:
            if (num in myset):
                return num
            myset.add(num)

'''
Runtime: 176 ms, faster than 95.45% of Python online submissions for N-Repeated Element in Size 2N Array.
Memory Usage: 12.6 MB, less than 98.78% of Python online submissions for N-Repeated Element in Size 2N Array.
'''