Java Solution - O(n)


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    Similar to Decimal-Binary conversion, convert the string of alphabets to the base 26

        public int titleToNumber(String s) {
            int value = 0;
            for(int j=0, i=s.length()-1; i>=0; i--, j++)
                value += ((int)Math.pow(26, j) * (s.charAt(i)-'@'));
            return value;
        }
    

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