[题目]
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
[题目解析] 该题目比较简单，可以理解为一个26进制的数用10进制数表示的过程。
public int titleToNumber(String s) { if(null == s || s.length() == 0) return -1; char sarr[] = s.toCharArray(); int base = 26; int index = sarr.length - 1; int result = 0; for(char c : sarr){ int num = c - ‘A‘ + 1; result += num * Math.pow(base, index); index--; } return result; }
[Leetcode] NO. 171 Excel Sheet Column Number
原文：http://www.cnblogs.com/zzchit/p/6053819.html