The coding interview is the most challenging part of the tech hiring process. Here's your complete guide to acing it.
The 4-Week Prep Plan
Week-by-week breakdown:
- Week 1: Arrays, Strings, Hash Tables (30 problems)
- Week 2: Trees, Graphs, BFS/DFS (25 problems)
- Week 3: Dynamic Programming, Recursion (25 problems)
- Week 4: Mock interviews and review (10 problems + 5 mocks)
Problem-Solving Framework
Use this framework for every problem:
UMPIRE Method:
- U - Understand the problem (ask clarifying questions)
- M - Match to known patterns
- P - Plan your approach
- I - Implement the solution
- R - Review and test
- E - Evaluate complexity
Always think out loud! Interviewers want to see your thought process.
Common Patterns to Know
Master these patterns:
- Two Pointers
- Sliding Window
- Fast & Slow Pointers
- Merge Intervals
- Top K Elements
- Binary Search variations
- Tree DFS/BFS
- Graph traversals
During the Interview
Interview tips:
- Take 2-3 minutes to understand before coding
- Start with brute force, then optimize
- Write clean, readable code
- Test with examples before submitting
- Handle edge cases explicitly
Don't memorize solutions! Focus on understanding patterns and approaches.