Easy

Quiz

#168 Excel Sheet Column Title

APPROACH

Given a positive integer columnNumber, return the corresponding column title as it appears in a spreadsheet.

For example:

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

Example 1:

A -> 1

B -> 2

C -> 3

...

Z -> 26

AA -> 27

AB -> 28

...

Example 2:

Input: columnNumber = 1

Output: "A"

Example 3:

Input: columnNumber = 28

Output: "AB"

Example 4:

Input: columnNumber = 701

Output: "ZY"

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What is the optimal approach for this problem?