<p>Hey Guru,</p><p>The solution in this extra problem seems quite convoluted but it only has minimum explanation. As a mediocre learner myself, I spent a lot of time on it, I was stuck and I felt upset about not fully understanding it.</p><p>From the perspective of good course content design, if the extra problem is important, you should list it as a stand-alone problem and give a detailed explanation, even a video explanation like what NeetCode does; If the extra problem is not important, since the solution is convoluted, it's better to remove it to avoid blocking the learners.</p><p>This is just my two cents. What do you think?</p><p>Thanks!</p>