Excel Sheet Column Number (Easy)

Description

Related to question Excel Sheet Column Title

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

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For example:

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

Analysis

简单题

My Solution

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