✅Excel Column Number

Excel Column Number - InterviewBitInterviewBit

int Solution::titleToNumber(string A) {
    int res = 0;

    for(int i = 0; i < A.size(); i++) {
        char ch = A[A.size() - 1 - i];
        int magniute = ch - 'A' + 1;
        res += magniute * pow(26, i);
    }

    return res;
}

Time Complexity: $O(n)$​

Space Complexity: $O(1)$​