Leedcode OJ] #171 Excel Sheet Column number

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title Link: https://leetcode.com/problems/excel-sheet-column-number/
Test Instructions:given a~z, which represent 1~26,aa-27,ab-28, and so on, now given a string of letters, requiring it to be converted to a number
Ideas:using the idea of the system, it can be converted into the idea of seeking the system.

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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Leedcode OJ] #171 Excel Sheet Column number