168、Excel|168、Excel Sheet Column Title 168、ExcelSheetColumnTitle

https://leetcode.com/problems/excel-sheet-column-title/
Given a positive integer, return its corresponding column title as appear in an Excel sheet.
【168、Excel|168、Excel Sheet Column Title】For example:

1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB

class Solution { public: string convertToTitle(int n) { if (n == 0) { return ""; } return convertToTitle((n - 1) / 26) + (char)((n - 1) % 26 + 'A'); } } ;