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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.

he asked me in first about wireless communications but i told him that i don't know so much about them so, he asked about serial communications : what is the difference between asynchronous and synchronous , draw the clock pulses , what is the SPI , how many lines in it and what is the use for each
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Junior Software Engineer

Interviewed at Valeo

3.8★
Oct 18, 2016

he asked me in first about wireless communications but i told him that i don't know so much about them so, he asked about serial communications : what is the difference between asynchronous and synchronous , draw the clock pulses , what is the SPI , how many lines in it and what is the use for each

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