Given a string , return the longest unique substring that occurs within . A unique substring is a substring within which DOES NOT have any repeating characters. As an example, "xd" is unique but "xxd" is not.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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LAB RESTRICTIONS, PLEASE READ:
- Do not add any imports, the ones that you need will be given to you.
- Do not use recursion.
- Do not use try-except statements, you should be able to anticipate
or prevent any errors from happening at all!

- Code in python 

- Should work for given doctest 

def longest_unique_substring(s: str) -> str:
"""
Given a string <s>, return the longest unique substring that occurs within
<s>.

A unique substring is a substring within <s> which DOES NOT have any
repeating characters. As an example, "xd" is unique but "xxd" is not.

If there are two equal length unique substrings within <s>, return the one
that starts first (i.e., begins at a smaller index).

>>> longest_unique_substring('aab')
'ab'

"""

 

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