leetcode[171]:Excel Sheet Column Number

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:

int titleToNumber(char* s) {
int i,n,res;
n=strlen(s);
res=0;
for(i=0;i<n;i++)
{
res += (s[i]-'A'+1)*pow(26,(n-i-1));
}
return res;
}

进制转换。