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
 

1.解决方案

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》

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