Excel sheet column number for leetcode topic resolution

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 

Hexadecimal

    public int titleToNumber(String s) {
        int n = 0;
        int p = 1;
        for (int i = s.length() - 1; i >= 0; i--) {
            n += (s.charAt(i) - 'A' + 1) * p;
            p *= 26;
        }
        return n;
    }