0168. Excel Sheet Column Title

https://leetcode.com/problems/excel-sheet-column-title

Description

Given an integer columnNumber, return its corresponding column title as it appears in an Excel sheet.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28 
...

Example 1:

**Input:** columnNumber = 1
**Output:** "A"

Example 2:

**Input:** columnNumber = 28
**Output:** "AB"

Example 3:

**Input:** columnNumber = 701
**Output:** "ZY"

Example 4:

**Input:** columnNumber = 2147483647
**Output:** "FXSHRXW"

Constraints:

• 1 <= columnNumber <= 231 - 1

ac