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题目：

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

1 -> A    2 -> B    3 -> C    ...    26 -> Z    27 -> AA    28 -> AB

代码：

class Solution(object):    def convertToTitle(self, n):        """        :type n: int        :rtype: str        """        results = ''        while n:            results = chr((n-1)%26+65)+results            n = (n-1)/26        return results

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