171._excel_sheet_column_number.md

###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
        
```