Excel Sheet Column Number

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

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

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