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:

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28 
此题比较简单
java代码:

public class Solution {
    public int titleToNumber(String s) {
        int result=0;
        for(int i=0;i<s.length();i++){
            result=result*26;
            result+=s.charAt(i)-'A'+1;
        }
        return result;
    }
}

　　charAt()函数:

例s.charAt(i)  去s串中第i个元素。