171. Excel Sheet Column Number

171 - Excel Sheet Column Number

Total Accepted: 84177 Total Submissions: 198174 Difficulty: Easy

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
Credits:
Special thanks to @ts for adding this problem and creating all test cases.

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public class Solution {
    public int titleToNumber(String s) {
        int res = 0;
        for(int i = 0; i < s.length(); i++) {
            res = 26 * res +  (s.charAt(i) - 'A' + 1);
        }
        
        return res;
    }
}