https://oj.leetcode.com/problems/excel-sheet-column-title/
http://blog.csdn.net/miss_snow_m/article/details/42098357
public class Solution {
public String convertToTitle(int n) {
if (n <= 0)
return null;
StringBuilder sb = new StringBuilder();
do
{
int d = n % 26;
sb.append(toC(d));
n = (n - 1) / 26;
}
while (n > 0);
return sb.reverse().toString();
}
private char toC(int d)
{
if (d == 0)
d = 26;
return (char)(‘A‘ + d - 1);
}
}[LeetCode]168 Excel Sheet Column Title
原文：http://7371901.blog.51cto.com/7361901/1601310