Having a clear learning sequence was really helpful. I haven't used C++ for development yet so I'm not entirely sure, but when learning data structure concepts, there were so many different types of sorting that it was difficult to decide which ones to skip and which ones to study.

Occasionally, after running the test cases, all the test cases I wrote get wiped out — this is really inconvenient.

When you're studying data structures and algorithms on your own, I don't think there's a site like Codetree.

Codetree lets you learn stage by stage, and I think using a system like that will get you proficient quickly.

It seems like a good platform for improving your algorithm and coding skills.

Now that Baekjoon is gone, I think this is the best environment for studying problem solving.

I couldn't help but admire how the service keeps getting better day by day.

The advantage that stuck with me most is that you don't have to enter the expected output yourself for the test cases you write.

With mobile support I could study seamlessly on a tablet and other devices, which I found more satisfying than other services. It's useful for every learner, from non-majors to people preparing for coding tests.

I appreciated getting answers to my questions right away.