Preview:
class Solution {
public:
    int titleToNumber(string columnTitle) {
        int sum=0;
        
        int n=columnTitle.size();
        for(int i=0;i<n-1;i++)
        {
            sum=sum+pow(26,(n-i-1))*(columnTitle[i]-'A'+1);
        }
        sum=sum+(columnTitle[n-1]-'A'+1);
        return sum;
    }
};
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