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 };
原文：http://www.cnblogs.com/ittinybird/p/4433537.html