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Two Pointers Technique
A simple pattern that turns O(NĀ²) brute force solutions into O(N). Master the two pointer technique and recognize the problem types where it applies.
Tries ā Prefix Trees Explained
The data structure behind autocomplete, spell checkers, and IP routing. Learn how tries store strings efficiently and enable O(L) search regardless of how many words are stored.
Trees ā Binary Trees and Traversals
The data structure behind file systems, databases, and compilers. Master binary trees, the four traversal algorithms, and the recursive thinking pattern that unlocks every tree interview problem.
Transformers ā The Architecture Behind GPT
The neural network architecture that changed everything. Understand how transformers work, why attention replaced RNNs, and what actually happens inside GPT when you send a message.
Sliding Window Technique
The pattern that solves all contiguous subarray and substring problems in O(N). Learn fixed and variable window variants and recognise when to apply them.
Rate Limiting ā Algorithms and Implementation
How to protect your APIs from abuse, control costs, and ensure fair usage. Covers token bucket, leaky bucket, fixed window, and sliding window algorithms with real implementation patterns.
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