Excel Sheet Column Titles@leetcpde

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 

Credits:

进制转换，注意当 n%26 == 0的情况。

	class Solution {
	public:
	string convertToTitle(int n) {
	string str;
	while(n){
	int r=n%26;
	n=n/26;
	if(r==0){ //为26的整数倍，该位设置为Z，n减掉1
	str+='Z';
	n--;
	}else{
	str+=('A'+r-1);
	}
	}
	reverse(str.begin(), str.end());
	return str;
	}
	};

view raw Excel Sheet Column titles hosted with ❤ by GitHub