Excel Sheet Column Number

Description：

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

Code：

int titleToNumber(string s) {
int result = 0;
for (int i = 0; i < s.size(); i++)
{
result+=(s[i]-'A'+1)*(int)(pow((double)26,s.size()-i-1));
}
return result;
}

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