String Interview Patterns
9 min read Strings appear in roughly 25-30% of coding interviews. Unlike arrays or trees, string problems have a concentrated set of patterns […] Read article
Algorithms, Coding Interview Questions, String Manipulation
Algorithms, Coding Interview Questions
Interval Interview Patterns
7 min read Interval problems are a reliable interview topic at every level. The core patterns repeat across dozens of problems – learn Read article
Algorithms, Coding Interview Questions, Trie
Trie Interview Patterns
9 min read Trie (prefix tree) problems appear frequently in coding interviews. This guide covers the core patterns with Python implementations you can Read article
Algorithms, Coding Interview Questions, Graphs, Shortest Path
Graph Shortest Path Interview Patterns
11 min read Shortest path problems appear in nearly every graph interview. The key skill is recognizing which algorithm applies to the given Read article
Algorithms, Coding Interview Questions, Data Structures
Range Query Interview Patterns
10 min read Range query problems appear frequently in competitive programming and technical interviews. Knowing which data structure to reach for – and Read article
Algorithms, Coding Interview Questions, Monotonic Queue, Queue
Queue and Deque Interview Patterns
8 min read Monotonic Deque Pattern – Sliding Window Maximum LeetCode 239. Given an array and window size k, return the maximum in Read article
Algorithms, Coding Interview Questions, Math
Probability and Statistics Interview Patterns
7 min read Core Probability Concepts Probability questions test your ability to reason about uncertainty and expected behavior. Three concepts appear repeatedly in Read article
Coding Interview Questions
Two Eggs and an 80-Floor Building: Optimal Drop Strategy
5 min read The Two-Eggs (Light Bulbs) Problem: 80-Floor Building, Optimal Strategy, and DP “You have 2 eggs and a 100-floor building. Find Read article
Coding Interview Questions
Return True with Probability p/q: Sampling Without Bias
5 min read Return True with Probability p/q: Sampling Without Bias “Given a function that returns a uniform random value, write a function Read article
Coding Interview Questions
Multiply Two Integers Without Multiplication: Russian Peasant, Bit Shifts
5 min read Multiply Two Integers Without Using Multiplication: Russian Peasant, Bit Shifts, Recursion “Multiply two integers without using the * operator” is Read article
Coding Interview Questions
Generate rand7 from rand5: Rejection Sampling for Random Sources
5 min read Generate Random Numbers in a Range Using a Smaller Random Source “Given rand5() that returns a uniform integer 1–5, implement Read article
Coding Interview Questions
Compute x^y for Floats and Negative Exponents: Fast Exponentiation
5 min read Compute x^y for Floats and Negative Exponents: Fast Exponentiation Computing pow(x, y) efficiently is LeetCode #50 and a frequently-asked interview Read article
Coding Interview Questions
paradox dragon
2 min read I met three dragons. One always tells the truth, other one always lies and the last one alternates between lie Read article
Coding Interview Questions
Bayesian Weather Forecasting: How Forecasts Update with Evidence
5 min read Bayesian Weather Forecasting: How Forecasts Update with Evidence “How do you forecast tomorrow’s weather given today’s observation?” is a classic Read article
Coding Interview Questions
Half full
2 min read A half is a third of it. What is it? 2026 Update: The Half-Full Glass — Estimation and Fermi Problems Read article