LeetCode:Excel Sheet Column Number

Excel Sheet Column Number

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Question Solution 

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 

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

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 Math

进制转换：number = number * 26（进制） + tmp（对应每一位的数值）;

 public int titleToNumber(String s) {        int ans=0;        for(int i=0;i<s.length();i++){            ans=ans*26+s.charAt(i)-'A'+1;        }        return ans;}