LeetCode 171. Excel Sheet Column Number

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 

• 题解：联想一下把它作为26进制去算就好了。

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