LeetCode:171. Excel Sheet Column Number

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题目概述

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

For example:

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A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28 
...

Example 1:

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Input: "A"
Output: 1

Example 2:

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Input: "AB"
Output: 28

Example 3:

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Input: "ZY"
Output: 701

进制转换的题目

代码实现

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class Solution:
    def titleToNumber(self, s: 'str') -> 'int':
        result = 0
        for i in range(len(s)):
            result *= 26
            result += ord(s[i]) - 64

        return result