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###171. Excel Sheet Column Number 题目: <https://leetcode.com/problems/excel-sheet-column-number/> 难度: Easy 26进制的反击 ``` class Solution(object): def titleToNumber(self, s): """ :type s: str :rtype: int """ maps = {} for i in range(65,91): maps[chr(i)] = i - 64 lst = list(s) lst.reverse() num = 0 for idx,item in enumerate(lst): num += maps[item] * (26 ** idx) return num ```