Given a column title as appears in an Excel sheet, return its corresponding column number. Example: A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28 Tags: InterviewBit Math Problems https://www.interviewbit.com/problems/excel-column-number/

ExcelColumnNumber.cpp

int Solution::titleToNumber(string A) {
     auto n = A.length();
     int value = 0;
     for (auto i=0; i<n; ++i)
     {
        value += pow(26, i)*(A[n-(i+1)] - 'A' + 1);
     }
     return value;
}