Shu Liu is amazing, and is one of my favorite professors at UCLA.

Grading Scheme was 50% HW, 15% Midterm, 34% Final, 1% Evaluation Survey at the end of class. You could also drop the Midterm for the Final. HW's were very straightforward and he gives you more than enough time to do them. Exams are very similar to the practice exams. He records lectures, and is very accessible in Office Hours. If you have any coding experience prior to taking his class, you can put in very minimal effort and expect an A. I can't say enough good things about this guy, take his class.

Went to class only once; he offers a hybrid (Zoom) option so that you can choose whether you would like to attend class in person or online. If you have taken APCSA in the past, the first 75% of the class will be very easy (I took it junior year and forgot what I learned but it all came back to me very very fast). The content is very easy to self-learn, especially if you have taken prior PIC classes; it's a bit difficult to understand Prof Liu during lectures, so I instead resorted to self-studying from extra slides he posted on BruinLearn (use Pham Minh's, they're so easy to understand). Homework assignments are VERY manageable and he gives a lot of time to complete them, too! And was very accommodating and understanding with the protests. Study for your midterm and final and you will be good ~ you are also allowed 1 double sided sheet of paper on the midterm, and 2 for the final. Recommend this class, doesn't take up much of your time (I kept forgetting I was taking this class), but still ended the class with over 100% with extra credit. (A+ ended up being 103%+ out of 104% possible).

I took PIC10A with Professor Liu and had an awesome experience, which is why I chose to take 20A with him. If you can take a PIC class with him, please do. He is a genuinely kind person that truly cares for his students and wants us to do well. He is extremely knowledgeable and always willing to help you after class and during office hours. He did hour plus review sessions before the midterm and final, and schedules so many extra office hours before exams. He would always extend homework deadlines based on the pace of our class, and any extenuating circumstances (like the Palestine protests, TA strike, etc.) The homework was difficult but doable with the TA's help. Shreeram Athreya was an amazing TA. The exams were quite fair if you studied for them. Overall, absolutely love Professor Liu. Would highly recommend him for any of the PIC courses.

For context, I had Kashefi for 10A originally and immediately tried switching to Professor Liu's lecture. He was super accommodating and let me in, although the class was all full. Liu uses slides, which is really helpful for understanding concepts/studying. His lectures are well structured and organized, and he really cares about teaching and helping us. He hosted extra office hours during midterms and finals week, and had a Zoom review session for each. His exams were fair. Though the content gets more difficult after the midterm, it's definitely still doable if you study and pay attention during lecture. Professor Liu is also so nice and helpful. Always willing to help debug or answer questions after lecture. Would definitely recommend him!

If you ever get a chance to take a PIC Class with Shu Liu, DO IT! He is so clear and very helpful with all questions. His lecture style is showing a concept, and then giving a few examples. He does lowk read off slides, but I don't mind/actually prefer that method. But, I had him for 10A and 20A and he is a really great prof.

Probably the shittest professor I have had in a long time, his lectures are all over the place, the recordings are terrible quality and his tests are absurdly hard. The average for our midterm was a 72%.... with no curve. He does have some good memes tho like his review document which says "Get familiar with the content". But for real don't take this dude unless u haveeee toooo like this man made me seriously consider dropping the specialization in computing even though I breezed through PIC10A,10B-- TLDR -don't take.