Here's how BudiBadu works from start to finish:

1. Browse Problems: Navigate to /problem and filter by category or difficulty.
2. Select Language: Choose your preferred programming language (Python, JavaScript, Java, etc.).
3. Write Code: Use the built-in code editor with syntax highlighting.
4. Run Tests: Click "Run" to test against sample cases before submitting.
5. Submit: Click "Submit" to run against all hidden test cases via Judge0.
6. View Results: See your result (Accepted, Wrong Answer, TLE, etc.) instantly.

Only "Accepted" submissions are stored and count toward your XP and statistics.

BudiBadu uses Judge0, an open-source online code execution system, to evaluate your submissions:

• Your code is sent to our secure Judge0 cluster.
• It runs in an isolated Docker container with strict resource limits.
• Results are returned within milliseconds, including execution time and memory usage.

Judge0 supports multiple languages and provides accurate, sandboxed execution—ensuring fair and consistent results for all users.

Experience Points (XP) are awarded per answer per platform per problem:

• Easy: 10 XP per accepted answer
• Medium: 25 XP per accepted answer
• Hard: 50 XP per accepted answer

This means if you solve Problem A with Python (10 XP) and then solve it again with Go (10 XP), you earn 20 XP total. Each language/platform combination counts separately!

After you solve a problem, you can view Best Answers—verified reference solutions for each language:

• Switch between tabs to see solutions in Python, JavaScript, Java, Go, etc.
• Each solution includes a "Copy Code" button for easy reference.
• Study optimized approaches and compare with your own solution.

Best answers are curated to show clean, efficient implementations.

Each problem page includes a Comments section where users can:

• Ask questions about the problem statement or test cases.
• Share hints and discuss approaches (without spoiling the answer).
• Help other users who are stuck.

Sign in with GitHub to participate in discussions. Comments are tied to your profile.

Every problem on BudiBadu comes with:

• Problem Description: Clear explanation of what you need to solve.
• Input/Output Examples: Sample test cases with expected results.
• Starter Code: Pre-filled function templates for each language.
• Constraints: Size limits to help you understand time/space requirements.

The code editor loads a starter template based on your selected language, so you can start coding immediately.

BudiBadu uses a carefully designed leveling system:

• Levels 1-15: Each level has a predefined XP range with increasing gaps.
• Levels 16+: XP requirement grows linearly. Each level adds +500 XP to the gap.

The leaderboard ranks users by total XP earned across all problem-platform combinations.