[LeetCode] Problem 168 - Excel Sheet Column Title

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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 
...

Example

No.1

Input: 1

Output: “A”

No.2

Input: 28

Output: “AB”

No.3

Input: 701

Output: “ZY”

Code

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public String convertToTitle(int n) {
    StringBuilder sb = new StringBuilder();

    while (n > 0) {
        sb.append((char) (--n % 26 + 'A'));
        n /= 26;
    }

    return sb.reverse().toString();
}