[leedcode 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
public class Solution { public int titleToNumber(String s) { //26进制转化为十进制，从输入值的高位向低位计算 if(s==null||s.length()<=0) return 0; int res=0; for(int i=0;i<s.length();i++){ res=res*26+s.charAt(i)-'A'+1; } return res; } }