Uploaded January 2021 | Updated September 2026, 2 weeks ago

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Today, I tested my problem solving (and coding) skills on HackerRank.com.

Watching a bunch of competitive programming YouTube videos (mostly William Lin) and coding interview videos (mostly Clément Mihailescu) inspired me to try solving some problems on my own.

HackerRank is a good website to practice your coding skills in many different areas such as algorithms, data structures, math, databases, functional programming, artificial intelligence and more. It provides fun challenges with different difficulties (easy, medium, hard) and a good range of programming languages to choose from (C, C++, C#, Java, JavaScript, PHP, Ruby, Python, Perl, Haskell, Clojure, Scala, Swift, Lisp, VB.NET, Rust...).
hackerrank.com

I'm not sponsored or in any way affiliated with HackerRank, this is my honest review.

Source code:
#1 Between two sets - github.com/DoubleDebug/hacker-rank-solutions/blob/main/between-two-sets.cpp
#2 Climbing the leaderboard - github.com/DoubleDebug/hacker-rank-solutions/blob/main/climbing-the-leaderboard.cpp

Timestamps:
00:00 - 00:56 Intro
00:56 - 03:05 Intro to HackerRank
03:05 - 15:03 Problem #1
15:03 - 24:04 Problem #2
24:04 - 24:25 Outro
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