leetcode【171】Excel Sheet Column Number

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写在最前面：很简单的一道题，等airpods等的心急，写点简单的消遣消遣

leetcode【171】Excel Sheet Column Number

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 
    ...

Example 1:

Input: "A"
Output: 1

Example 2:

Input: "AB"
Output: 28

Example 3:

Input: "ZY"
Output: 701

就类似于26进制，字符串对应数字最简单的就是利用ASCII码

class Solution(object):
    def titleToNumber(self, s):
        """
        :type s: str
        :rtype: int
        """
        n = len(s)
        num = 0
        for i in range(n):
            num += (ord(s[i])-64)*(26**(n-i-1))
        return num

简单吧