171. Excel Sheet Column Number

Excel Sheet Column Number

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.

Solution

public class Solution {
      public int titleToNumber(String s) {
        int result = 0;
        for(Character c: s.toCharArray()) {
            int cur = c - 'A' + 1;
            result = result * 26 + cur;
        }

        return result;
    }
}