Professor Bejarano is a great lecturer, and will take the time to answer students' questions in a thorough and complete manner. Attend class. The most difficult part about the midterms is the time limit, but if you attend class and do the assignments, they are entirely doable. There is no curve, but there are many opportunities for bonus points.

I think he did a great job teaching the class. He was very clear and his lectures were easy to understand. The homework and projects were not bad as long as you start them on time. Don't expect to be able to do everything last minute. As long as you pace yourself and show up to class you can expect to learn a lot from Professor Posada.

Very good lecturer. He's very easy to understand and follow. There're homework and projects due every week (Summer class) but they're manageable as long as you start early. A lot of extra credit opportunities. Exams are easy enough and the practice materials he gives prepare you well for those.

Good lecturer and helpful Powerpoint. The reason I give a 4.0 difficulty is that I think algorithm is a difficult topic, especially understanding the mathematical proofs and mechanism behind the scene . However, this class is designed to get good grade easily.

Solid lectures, blending slides and hand worked examples, thoroughly going through every step of an algorithm. He very intentionally does not have a curve, but he makes sure the scores are roughly reasonable. I highly recommend his office hours; I did not attend myself until the end of the semester.

Super Awesome professor

When he actually cares about your mental health :)

says he cares about our mental health and proves it

Super interesting lectures and actually cares about students' mental health.

He actually cares about his students' mental health and is a good lecturer. Really cares about students learning the material in a meaningful way

Legendary Professor. Cares about all of his students. Exciting lectures, easy exams, sometimes difficult homework and projects but a prepared student should be able to handle with no problems.

Amazing professor all around. His lectures are interesting and fairly easy to follow. His slideshows are top tier, easy to take in with plenty of examples and plenty of visuals to assist with understanding. He cares a lot about his students and is very receptive to any questions or comments regarding the class. Overall, absolute king of a professor

Relates to the struggles of students and is reasonable; even gave a few "mental health days" without lectures throughout the semester. Class content is fairly tough, but he explains the topics well.

Just a really solid lecturer for CS251. I took it during summer and he made appropriate adjustments to the course structure.

Amazing professor all around, who is willing to help if you actually talk to him. Was never unreasonable, and willing to admit mistakes and change things based on feedback from his few screwups. Engaging lecturer.

I took this class in the summer, and he gave us a lot of Extra Credit to help us out. Very fair grader with fair assignments and exams, and an awesome lecturer that actually cares. Overall, great guy.

He is a great lecturer, as well as a professor who actually cared about his students. We had a much more difficult course compare to previous one, but his wonderful lectures and sense of humor during lectures really lightened things up. Also, after exams, he would consider the actual difficulty and made reasonable decisions to help his students.

Difficulty of exams needs to be adjusted, but lectures were top tier.

CS251 Fall 2022 was a reasonably difficult class made easier by the fact that Posada is a great guy and a really good lecturer. The main weaknesses of the class is poor project design, but I heard that Posada was asked to make the class a lot easier and it shows. The midterms are very doable if you put in the time required. Little-no curve.

Amazing Professor. Exams were all doable. I got 100s on two midterms. Homework grading is great. Very easy class overall. Office hours are helpful to get help on homework and concepts. Final was worth the same as the midterms and did not have a super big impact on the grade, so the grading was well distributed.

Prof. Bejarano was an amazing lecturer. He didn't just read off of the slides, he wrote down the rundown of the algorithm and made sure that students understood the topics. This resulted in skipping a few topics, but I think it is better this way. Reasonably tough projects and exams, but not impossible if you put effort. He's nice in office hour

Course had a pretty good structure. The lectures were entertaining and kept me engaged. The homework sometimes felt tedious, but it was always pretty fair. The exams I would say are very fair, and very well reflect your understanding of the material. The projects were fine if you start on time and seek help if needed. Great course!

Definitely attend lecture since he randomly gives 1 quiz a week which contributes towards participation. His lectures are great, but personally I used JB's slides for the same content. Start the projects early and they should be an easy A (definitely go to office hrs for them). Homework is straight forward and really good practice for the exams.

He's pretty thorough when explaining concepts, and is always willing to reexplain something if need be in or out of class. The office hours, both his own and TA, are very helpful, and all projects and homework are manageable if you start early. The weekly quizzes aren't hard, but still not the most enjoyable thing to have to worry about.

Probably the best CS class I've taken at Purdue so far. Bejarano knows his stuff and explains it really well. His lectures are thorough and if you pay attention you'll definitely learn a lot about data structures & algorithms. A lot of his 1 ratings were cuz of one semester he had to make the class really hard cuz the department pressured him to.

His lectures have been the most interesting so far, as he is knowledgeable in what he is teaching and he explains them very clearly. Though he may have to sacrifice certain topics for the sake of time, he makes it up by explaining more difficult concepts much more clearly and making sure that no one falls behind on content.

Best lectures in the CS department. Was constantly cracking jokes that would make the whole class laugh, while also giving the best and most straight-forward lectures ever. If you paid attention, it was very easy to know what to do on the midterms. Projects were tough but doable. Overall, best professor I've had at Purdue.

One of the best teachers in the department. He's not afraid to move at the rate the class needs, lectures keep your attention, and they're almost always helpful. He's got a sense of humor and isn't scared to make a fool of himself.

Professor Bejarano is one of my favorite CS professors here at Purdue. His lecture style is good and engaging. It's definitely worth coming to his lectures in my opinion. I've taken two courses with him at Purdue (summer CS 182 and summer CS 251), and both have been great.

My favorite CS Professor. He is smart, funny, and give hard exams.

Difficult class, but learned a lot. Gave good lectures.

Posada is a very good professor. lectures engaging, projects challenging, exams very hard, but nice curve in the end.

His lectures are probably the most engaging I've seen so far. He's also able to explain most course content well, and it made the class much easier to experience.

Genuinely the greatest pure lecturer I've had thus far. He is entertaining and explains everything incredibly succinctly. His office hours are helpful and he cares about his students. The only problems I had were the course organization and the exam structure.

He is my favorite CS professor I have had so far. His lectures were actually worth attending and helped me understand what we were working on. The homeworks were tough but we had plenty of time to complete them. The projects could take some time but connected well with what we worked on.

One of the best lecturers at Purdue: he cares a lot about our learning and will go at good pace where we can take notes AND understand what is going on. Homework/projects are a lot of work, but they are very fair and TAs can help. Midterms/Finals were all MCQs so it isn't hard to do well (C/B) but it can be quite hard to get an A/A- as no curve.

My favorite CS professor by far. His lectures are amazing and he clearly explains the difficult concpets well. His exams and projects can be difficult, but far from unreasonable.

Very hard class with a lot of workload but the professor was quite easily the best CS professor I have had at Purdue. The lectures are optional but he does an amazing job of explaining every concept and makes them very interesting.

One of my favorite CS professors I've had at Purdue, his lectures were extremely helpful. Not mandatory, but I highly recommend going to them, they're pretty easy to follow and take notes on. Lots of examples so that we can see the concepts in practice. The content is definitely hard, the projects took a while, and there were 3 midterms.

Very good lecturer. Class was not too hard, homeworks and projects were doable if you started early.

Definitely go to all lectures and take notes. Posada is an AMAZING lecturer and really makes otherwise difficult concepts easy to understand. Midterms and the final are worth most of your grade, so be sure to study ahead of time. Also complete the projects, they will boost your understanding of concepts even through they are hard.

GOAT lecturer and fair grading.

By far the best lecturer I have ever had. He writes down essential information and elaborates on it during lectures. I think the clearest way to tell he was great was the fact that attendance wasn't required but the lecture was always packed. My only problem is that the TAs were pretty useless and gave wrong information sometimes.

If you're going to take 251, try to do it with him. He's one of the most competent lecturers in the department and teaches the content really well. Homeworks and projects are tough, so make sure to reach out to TAs.

Some of the best lectures I have ever attended. Class is heavily skewed toward tests. Tests are difficult but they are fairly graded.

A very good professor, explained everything clearly and also had some funny jokes. Sarcastic in brightspace, and in a cool way. Tests were difficult, but fair. He set a decently big curve for the class.

Easily one of my favorite CS professors I've had the fortune of learning from in my time here. He is clearly well versed not only in the material, but also how to appropriately teach it. Some of the best paced and digestible lectures I've ever attended. I think he's witty,charming, and clearly cares about his students. Can't recommend him enough!