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DIY: Longest Substring without Repeating Characters

Explore how to identify the longest substring without repeating characters in a given string. Learn to implement this solution in Rust, enhancing your string manipulation skills and preparing for coding interviews with practical examples.

Problem statement

In this coding example, you are given a string strr. 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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