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DIY: Longest Substring without Repeating Characters

Explore how to identify the longest substring without repeating characters in a given string. Understand the problem by implementing a function that returns both the substring and its length, preparing you for similar coding interview challenges.

Problem statement

In this coding example, you are given a string str. Your task is to find the longest substring without repeating characters. You also have to return the length of this longest substring.

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