Excel Sheet Column Number

Link

Straightforward question. Just look what place the character is at and what character it is, and deterimine it's value from there.

Full Solution in Java:

 public class Solution {
    public int titleToNumber(String s) {
        
        int result = 0;
        int place = 0;
        
        for(int i=s.length()-1; i>=0; i--){
            result+=(int)(Math.pow(26,place))*(s.charAt(i)-64);
            place++;
        }
        return result;
    }
}