[LeetCode] 171. Excel Sheet Column Number

轉自LeetCode

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 

<Solution>
Excel Sheet Column Title 的相關題，只是變成從文字轉成數字

一樣也是一位一位處理，每增加一位是乘以26

code如下