LeetCode 171 -Excel Sheet Column Number ( JAVA )

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) {
s.toUpperCase();
int count = s.length()-1;
int Number = 0;
for(int i = 0 ; i < s.length(); i++){
Number += (s.charAt(i)-'A'+ 1)* Math.pow(26,count--);
}
return Number;
}
}

总结:本体为给定字符串，按照题目给出的字符对照片来求出给定字符串的值，一个循环解决了，效率不高，才6.13%