Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28

class Solution {
public:
int titleToNumber(string s) {
//the last bit of s, multiply 26
//then left move 1 bit, multiply 26^2
//iterate int len = s.length();
int ret = ;
int multiplier = ;
int cur;
for(int i = len-; i >= ; i--){
cur = s[i]-'A'+;
ret += cur*multiplier;
multiplier *= ; } return ret; }
};

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