【LEETCODE】171-Excel Sheet Column Number

Related to question Excel Sheet Column Title

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

For example:

    A -> 1

    B -> 2

    C -> 3

    ...

    Z -> 26

    AA -> 27

    AB -> 28 

26进制转10进制

class Solution(object):    def titleToNumber(self, s):        """        :type s: str        :rtype: int        """        r=0                for i in range(len(s)):            r=r*26            r=r+ord(s[i])-64                return r