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
int titleToNumber(char* s) {
int len = strlen(s);
int i;
int sum = 0;
for (i = 0; i < len; ++i)
{
if (s[i] >= 'A' && s[i] <= 'Z')
sum = sum * 26 + (s[i] - 'A' + 1);
}
return sum;
}