《leetCode》：Excel Sheet Column Number

题目

Related to question Excel Sheet Column TitleGiven 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 

思路

与上一个题目思路相反即可完成。

public int titleToNumber(String s) {        if(s==null){            return 0;        }        int len=s.length();        int res=0;        for(int i=0;i<len;i++){            int temp=s.charAt(i)-'A'+1;            res=res*26+temp;        }        return res;    }