Algorithms

⏱ 5 min read Trie Data Structure Interview Patterns: Autocomplete, Word Search & Prefix Problems A Trie (prefix tree) is the go-to data structure […] Read article

⏱ 5 min read Graph Algorithms Interview Patterns: BFS, DFS, Dijkstra & More Graph problems appear in roughly 25% of FAANG algorithm interviews. Mastering Read article

⏱ 4 min read Why Math in Coding Interviews? Math problems appear in interviews at all levels — they test logical reasoning and knowledge Read article

⏱ 7 min read Why Concurrency in Interviews? Concurrency problems appear at senior-level interviews (SDE-2 and above) at companies like Apple, Google, and Databricks. Read article

⏱ 7 min read Why Hash Maps Are Fundamental Hash maps (dictionaries in Python, HashMaps in Java) provide O(1) average-case lookup, insertion, and deletion. Read article

⏱ 5 min read Why Sorting Algorithms Matter in Interviews Sorting knowledge signals deep CS understanding. Interviewers ask about sorting to evaluate: time/space complexity Read article

⏱ 7 min read What Is Topological Sort? A topological sort of a directed acyclic graph (DAG) produces a linear ordering of vertices such Read article

⏱ 7 min read Grid DP Overview Grid DP problems involve a 2D grid where you make decisions at each cell and need to Read article

⏱ 7 min read When Do You Need These? Segment trees and Fenwick trees (Binary Indexed Trees / BIT) solve range query problems efficiently. Read article

⏱ 6 min read The Recursion Mindset Recursion solves a problem by defining it in terms of a smaller version of the same problem. Read article

⏱ 7 min read The Divide and Conquer Paradigm Divide and conquer solves problems by: (1) Divide — split the problem into smaller subproblems Read article

⏱ 6 min read What Is Union-Find? Union-Find (also called Disjoint Set Union or DSU) is a data structure that efficiently tracks which elements Read article

⏱ 7 min read What Is a Monotonic Stack? A monotonic stack is a stack that maintains its elements in either monotonically increasing or Read article

⏱ 7 min read Tree Traversal Fundamentals Binary tree problems appear in nearly every technical interview. The foundation is traversal order, which determines which Read article

⏱ 8 min read String dynamic programming problems — longest common subsequence, edit distance, palindromic subsequences — appear frequently in senior engineering interviews. These Read article