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Given a positive integer, return its corresponding column title as appear in an Excel sheet.
For example:
1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB
使用ASCII码一一对应
def convert_to_title(n) ans = ‘‘ while n > 0 n -= 1 ans = (65 + n % 26).chr + ans n /= 26 end ans end
Leetcode 168 Excel Sheet Column Title
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原文地址:http://www.cnblogs.com/lilixu/p/4625975.html