Excel Sheet Column Title

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
 1 class Solution {
 2 public:
 3     string convertToTitle(int n) {
 4         string s;
 5         char c=0;
 6         while(n) {
 7             if(n%26) {
 8                 c = 'A' + n%26 -1;
 9                 s.insert(s.begin(),c);
10             }
11             else {
12                 c= 'Z';
13                 n -= 26;
14                 s.insert(s.begin(),c);
15             }
16             n /= 26;
17        }
18        return s;
19     }
20 };
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原文地址：https://www.cnblogs.com/ittinybird/p/4433537.html