Coding Interview Preparation
“In preparing for battle I have always found that plans are useless, but planning is indispensable.” — Dwight D. Eisenhower
🎯 What Coding Interviews Test
Coding interviews evaluate far more than your ability to write code. Interviewers assess:
┌─────────────────────────────────────────────────────────┐
│ CODING INTERVIEW EVALUATION │
├─────────────────────────────────────────────────────────┤
│ │
│ 1. Problem Solving (40%) │
│ ├── Understanding the problem │
│ ├── Breaking it down │
│ ├── Identifying patterns │
│ └── Handling edge cases │
│ │
│ 2. Technical Knowledge (30%) │
│ ├── Data structure selection │
│ ├── Algorithm design │
│ ├── Complexity analysis │
│ └── Language proficiency │
│ │
│ 3. Communication (20%) │
│ ├── Explaining your approach │
│ ├── Asking clarifying questions │
│ ├── Discussing trade-offs │
│ └── Responding to hints │
│ │
│ 4. Code Quality (10%) │
│ ├── Readable variable names │
│ ├── Clean structure │
│ ├── Error handling │
│ └── Testing │
│ │
└─────────────────────────────────────────────────────────┘
📖 In This Section
| Guide | What You’ll Learn |
|---|---|
| Data Structures | Complete reference for arrays, trees, graphs, hash maps, and more |
| Problem Patterns | 15+ patterns that solve 90% of interview problems |
| Complexity Analysis | Big-O notation, amortized analysis, space-time trade-offs |
| Coding Framework | Step-by-step approach to any coding problem |
📊 Problem Difficulty Distribution
Based on analysis of recent FAANG interviews (2024-2026):
Easy ████████░░░░░░░░░░░░ 20% (Warm-up, usually < 10 min)
Medium ████████████████░░░░ 55% (Core of most interviews)
Hard █████░░░░░░░░░░░░░░░ 25% (Differentiator for senior roles)
Key insight: You don’t need to solve Hard problems to get hired. Consistently solving Medium problems with clean code and good communication is enough for most offers.
🎓 Recommended Problem Sets
By Platform
- LeetCode: Top 150 (Blind 75 + NeetCode 150)
- HackerRank: Interview Preparation Kit
- CodeForces: Div 2 A-C problems for speed
By Topic Priority
- Arrays & Strings — Most common, master these first
- Trees & Graphs — Second most common, essential for Google
- Dynamic Programming — Hard but predictable patterns
- Linked Lists — Common for fundamentals testing
- Stacks & Queues — Often combined with other structures
- Hash Maps — Used in almost every problem as a component
⏱️ Time Management in Interviews
For a 45-minute coding interview:
┌─────────────────────────────────────────────┐
│ TIME ALLOCATION (45 min) │
├─────────────────────────────────────────────┤
│ Understanding & Questions 5 min (11%) │
│ Approach & Discussion 8 min (18%) │
│ Coding 20 min (44%) │
│ Testing & Edge Cases 7 min (16%) │
│ Follow-up / Optimization 5 min (11%) │
└─────────────────────────────────────────────┘
🔗 Cross-References
- Cheat Sheets — Quick reference for all CS fundamentals
- Revision Notes — Quick review before interviews
- System Design — For senior roles, coding + system design are both critical