Meta OA Comprehensive Review | 4 Questions All AC

📋 OA Basic Info

• Company: Meta
• Role: SDE
• Platform: CodeSignal
• Time: 70 mins
• Difficulty: Medium-Hard

🎯 Question Overview

Just guided a student to get All AC on Meta OA! 4 questions total, medium-hard difficulty, mainly testing logic, arrays, and simulations.

Q1: Array Simulation

Difficulty: ⭐⭐ Topic: Array traversal, Boundary handling Simulate array operations. Watch out for index out of bounds and O(n) complexity.

Q2: String Processing

Difficulty: ⭐⭐ Topic: String, Hash Map Pattern matching and replacement. Use Hash Map for mapping. Handle case sensitivity.

Q3: Greedy Algorithm

Difficulty: ⭐⭐⭐⭐ Topic: Greedy, Sorting Find optimal strategy. Sort first, derive global optimum from local optimum.

Q4: Dynamic Programming

Difficulty: ⭐⭐⭐⭐ Topic: DP, State Transition Define clear states, find transition equation, optimize space complexity.

💡 Summary

1. Time Management: 15-20-25-30 mins split.
2. Debugging: Run examples first, consider edge cases.
3. Code Style: Clean code, comments.
4. Test Cases: Construct extreme cases.

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