LeetCode Excel Sheet Column Title

1.题目

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

2.解决方案1

class Solution {
public:
    string convertToTitle(int n) {
        string result;
        string array[26] = {"A", "B", "C", "D", "E", "F" , "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
        while(n > 0){
            int indexNum = n % 26;
            if(indexNum == 0){
                indexNum = 26;
            }
            result = array[indexNum - 1] + result;
            n = (n-1) / 26;
        }
        return result;
    }
};

思路：就是26进制的概念，跟这题类似​​《​​​​Reverse Integer 反转一个int数》​​

​​http://www.waitingfy.com/archives/1611​​