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Given a string containing alphanumeric characters, write a function to find the longest substring with at most K distinct characters. If multiple substrings of the same length exist, return the first one found. Optimize the solution for both time and space complexity.
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Junior Software Engineer

Interviewed at Amazon

3.5
Aug 2, 2023

Given a string containing alphanumeric characters, write a function to find the longest substring with at most K distinct characters. If multiple substrings of the same length exist, return the first one found. Optimize the solution for both time and space complexity.

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