# Solving Leetcode Interviews in Seconds with AI: Excel Sheet Column Title


	# Introduction
	In this blog post, we will explore how to solve the LeetCode problem "168" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like [Chatmagic](https://www.chatmagic.app), we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

	# Problem Statement
	> 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"    Constraints:  1 <= columnNumber <= 231 - 1  

	# Explanation
	Here's the breakdown of the solution:

*   **Base-26 Conversion:** The problem is essentially converting a base-10 number to a base-26 number, where 'A' represents 1, 'B' represents 2, and so on, up to 'Z' representing 26.
*   **Remainder and Division:** We repeatedly take the remainder of the column number when divided by 26. This remainder (adjusted to be 0-25 instead of 1-26) gives us the rightmost character. Then, we divide the column number by 26 to get the remaining digits.
*   **Handle the 'Zero' Case:** Since there is no '0' in Excel column titles, whenever the remainder is 0, it means it's 'Z'. We subtract 1 from the column number to account for this "borrowing" from the next higher digit.

*   **Time and Space Complexity:** O(log<sub>26</sub>(N)) time complexity, where N is the input number. O(log<sub>26</sub>(N)) space complexity due to storing the characters in the result string.

	
	# Code
	```python
	def convertToTitle(columnNumber: int) -> str:
    result = ""
    while columnNumber > 0:
        columnNumber -= 1
        remainder = columnNumber % 26
        result = chr(ord('A') + remainder) + result
        columnNumber //= 26
    return result
	```