Deep dives into web development, AI engineering, and modern programming practices. From React patterns to building intelligent applications with LLMs.
Discover how a single character difference in duplicate-skipping logic can silently break your Four Sum solution. Learn why j > 1 fails across different loop iterations and how j > i + 1 ensures all valid quadruplets are found through real debugging examples.
Discover why nums[-1] doesn't crash JavaScript and how understanding arrays as objects can help you debug algorithm problems like 3Sum. Learn about negative indexing, property access patterns, and JavaScript's unique array behavior.
Master Floyd's cycle detection algorithm for finding cycle entry points in linked lists. Covers both compact interview solution and teaching-friendly implementation with mathematical intuition.
Master two iterative approaches for swapping adjacent nodes in linked lists: straightforward pointer manipulation vs elegant dummy head technique for cleaner code.
Compare two approaches to removing the nth node from the end of a linked list: explicit length counting versus elegant two-pointer technique with dummy head pattern.