Convert Positive Column Numbers to Uppercase Letter Titles
Company: Bloomberg
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: easy
Interview Round: Other
### Problem
Convert a positive spreadsheet column number to its uppercase letter title. The numbering is A=1 through Z=26, then AA=27, AB=28, and so on. Return the title string.
```cpp
string convertToTitle(int columnNumber);
```
### Examples
```text
Input: columnNumber = 52
Output: "AZ"
```
```text
Input: columnNumber = 703
Output: "AAA"
```
### Constraints
- `1 <= columnNumber <= 2147483647`.
Overview: Convert positive spreadsheet column numbers to bijective base-26 uppercase titles with correct Z-to-AA boundaries.