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