Lilly Tech Systems
Timed Coding Practice
Simulate real coding interviews with full mock exams. Each exam contains 3 problems you must solve under time pressure — just like the real thing. Progress from warm-up sets to full-difficulty gauntlets, with detailed solutions, complexity analysis, and strategies for maximizing your score when time is short.
Your Learning Path
Start with time management strategy, then tackle progressively harder mock exams.
1. How to Practice Under Time Pressure
Time management frameworks, when to move on to the next problem, partial credit strategies, and how to stay calm under pressure.
2. Mock Exam 1: Warm-Up
3 problems (Easy/Easy/Medium): Two Sum, Valid Anagram, Group Anagrams. 45-minute target time with full solutions.
3. Mock Exam 2: Arrays & Strings
3 problems (Easy/Medium/Medium): Contains Duplicate, Longest Substring Without Repeating Characters, Product of Array Except Self. 60 minutes.
4. Mock Exam 3: Trees & Graphs
3 problems (Medium/Medium/Medium): Binary Tree Level Order Traversal, Number of Islands, Course Schedule. 60 minutes.
5. Mock Exam 4: DP & Design
3 problems (Medium/Medium/Hard): Coin Change, Word Break, LRU Cache. 60 minutes. Dynamic programming meets system design.
6. Mock Exam 5: Full Difficulty
3 problems (Medium/Hard/Hard): Merge Intervals, Trapping Rain Water, Minimum Window Substring. 75 minutes. The real interview gauntlet.
7. Mock Exam 6: ML-Focused
3 problems: Implement KNN from Scratch, Build Feature Pipeline, Design Rate Limiter. 75 minutes. ML engineering meets coding.
8. Review & Improvement
How to review your performance, identify weak areas, build a spaced repetition plan, and continuously improve your timed solving speed.
What You'll Learn
By the end of this course, you will be able to:
Manage Your Time
Allocate time across problems, know when to move on, and maximize partial credit when you cannot finish a solution.
Solve Under Pressure
Build the muscle memory to read, plan, code, and test solutions within strict time limits without panicking.
Cover All Difficulty Levels
Progress from easy warm-ups through medium-level core problems to hard challenges that separate top candidates.
Review & Improve
Analyze your performance after each exam, identify weak patterns, and build a targeted improvement plan using spaced repetition.