[LeetCode] Excel Sheet Column Number

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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 (E) Excel Sheet Column Title

 

 

分析：简单的进制转换。。

 

 

class Solution { 
    public: 
        int titleToNumber(string s) { 
 
            int num = 0; 
            for(int i = 0; i < s.size(); i++) 
            {   
                num = num * 26 + (s[i] - 'A' + 1); 
            }   
            return num; 
 
        }   
};