find longest substring - Assignment Geeks

Description

Write a Python function `find_longest_substring(s)` that takes a string `s` and returns the longest substring without repeating characters. If there are multiple substrings of the same maximum length, return the first one.

Example:

python

Example input:

s = abrkaabcdefghijjxxx

Expected output:

longest_substring = abcdefghij

Constraints:

1. The input string `s` will only contain lowercase English letters.

2. The function should run efficiently even for long strings (up to 10,000 characters).

Test Cases:

python

Test Case 1:

assert find_longest_substring(“abcabcbb”) == abc

Test Case 2:

assert find_longest_substring(“bbbbb”) == b

Test Case 3:

assert find_longest_substring(“pwwkew”) == wke

Test Case 4:

assert find_longest_substring(“abcddefg”) == abcdefg

Test Case 5:

assert find_longest_substring(“anviaj”) == nviaj

Write the `find_longest_substring` function that passes all the above test cases.

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