LeedCode OJ]#171 Excel Sheet Column Number

class Solution
{
public:
    int titleToNumber(string s)
    {
        int ans = 0;
        int len = s.length(),i,j;
        for(i = 0; i<len; i++)
        {
            int cnt = len-1-i;
            int a = s[i]-'A'+1,q = 1;
            while(cnt--)
                q*=26;
            ans=ans+a*q;
        }
        return ans;
    }
};

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