leetcode 168 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

Credits:

Special thanks to @ifanchu for adding this problem and creating all test cases.

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class Solution {
public:
string convertToTitle(int n) {
string res = "";

while(n > 0) {
int mod = n%26;
if(mod > 0) {
res += ('A'+mod-1);
n = n/26;
}
else if(mod == 0) {
res += 'Z';
n = n/27;
}
}

reverse(res.begin(), res.end());
return res;
}
};