Easy-35

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

AC:

int titleToNumber(char* s) {
    int len=strlen(s);
    int result=0;
    for(int i=0;i<len;i++)
    {
        int para=1;
        for(int j=0;j<i;j++)
        {
            para*=26;
        }
        result+=(s[len-1-i]-'A'+1)*para;
    }
    return result;
}

tips:输入zyx  输出 result=x*26^0+y*26^1+z*26^2