Coding Interview Questions

⏱ 1 min read When was the last year that looked the same upside down? (1961) 2026 Update: Strobogrammatic Numbers — Rotation Invariant Digits […] Read article

⏱ 2 min read A book costs $1 plus half its price. How much does it cost? 2026 Update: The Interview Icebreaker — How Read article

⏱ 3 min read You have 20 blue balls and 14 red balls in a bag. you put your hand in and remove 2 Read article

⏱ 2 min read A man has two cubes on his desk. every day he arranges both cubes so that the front faces show Read article

⏱ 2 min read In a country in which people only want boys, every family continues to have children until they have a boy. Read article

⏱ 2 min read You can go to a fast food restaurant to buy chicken nuggets in 6-pack, 9-pack or 20-packs. is there such Read article

⏱ 2 min read You have two identical crystal orbs. you need to figure out how high an orb can fall from a 100 Read article

⏱ 2 min read Solution Not really much to solve 🙂 2026 Update: Parallel Lines — Geometry Algorithms and Line Intersection Determining if lines Read article

⏱ 2 min read Solution You may be able to find the solution on the discussion forum. 2026 Update: Collision Detection — Computational Geometry Read article

⏱ 2 min read Solution You may be able to find the solution on the discussion forum. 2026 Update: Gestalt Perception and Counting Algorithms Read article

⏱ 1 min read At one point, a remote island’s population of chameleons was divided as follows: 13 red chameleons 15 green chameleons 17 Read article