I think it's possible people have different levels of intelligence. I've also experienced that I learn better through some teachers. If you're having trouble wi

I think it's possible people have different levels of intelligence. I've also experienced that I learn better through some teachers. If you're having trouble with combinatorics/algorithms, may I suggest: Probability: For the Enthusiastic Beginner by David Morin is the book that helped me get it. It's got tons of examples and I felt like I could work through them. Grokking Algorithms by me(!) is (in my biased opinion) an easier text for learning algorithms. Lots of pictures and examples. I initially learned through CLRS and did not find that one easy.