171. Excel Sheet Column Number

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Difficulty: Easy

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

我是把它看成是类似是26进制

C++:

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

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