[LeetCode]题解（python）：118-Excel Sheet Column Title

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题目来源

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https://leetcode.com/problems/excel-sheet-column-title/

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 

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题意分析

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Input:a number

Output:a string

Conditions:类似于用26进制，A为第一位，Z为第26位

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题目思路

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直接对应就好，注意有两个函数：ord（）和chr（）

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AC代码（Python）

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