LeetCode Everyday --171

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:

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

[code]class Solution {
public:
    int titleToNumber(string s) {

        int result = 0;
        for(int i = 0;i < s.length();i++){
            result = result * 26 + s[i] - 'A' + 1;
        }
        return result;
    }
};

思路很简单，将字符转换成相应数字，A-1,B-2…Z-26,将结果看成26进制数进行计算。