1582 articles
LeetCode 318 Maximum Product of Word Lengths — find two words sharing no letters with maximum length product. Encode each word as a 26-bit set, then check disjointness with one bitwise AND. The textbook FAANG bitmask interview problem.
Complete bit manipulation cheatsheet for FAANG interviews: all critical tricks, bitmask DP patterns, XOR properties, complexity table, and full problem index across 18 problems.
Strategic playbook for FAANG-specific DSA preparation. Covers Google graph and DP focus, Meta tree and string emphasis, and Amazon Leadership Principles alignment with BFS, heap and design problems.
LeetCode 240 Search a 2D Matrix II is a Google favourite that tests staircase elimination. We solve it in O(m + n) by walking from the top-right corner — beating the naive O(m * n) scan and the O(m * log n) per-row binary search.
LeetCode 269 Alien Dictionary is a Google premium classic that derives a character ordering from a sorted word list. We model it as a directed graph and run Kahn topological sort BFS to detect cycles and emit a valid order in O(C) time.