20. 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

思路：26进制

 

转载于:https://www.cnblogs.com/vincent93/p/6686557.html