Things I learned after solving 50+ Codeforces problems as a beginner

I've been practicing Codeforces regularly, and these are some things that helped me improve:

1. Read the constraints first.
   They often tell you whether an O(n), O(n log n), or O(n²) solution is possible.

2. Don't code immediately.
   First understand what the problem is asking and try a few examples manually.

3. Look for patterns in the examples.
   Sometimes the examples reveal an important observation that leads directly to the solution.

4. Check edge cases.
   Especially n = 1, all elements equal, already sorted arrays, and minimum/maximum values.

5. After getting WA, don't immediately copy another solution.
   Find the exact test case where my logic fails and understand why.

6. Keep the implementation simple.
   A shorter solution is often easier to debug and less likely to contain unnecessary mistakes.

I'm still learning, so these are just lessons from my own practice. Hopefully they help other beginners starting Codeforces.