LeetCode 171. Excel Sheet Column Number（Excel列号）

原题网址：https://leetcode.com/problems/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

方法：

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