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Your Skill Tree

Complete topics in order to unlock the next. Each algorithm earns XP.

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Arrays & Hashing

Master the building blocks of data storage. Learn how to use...

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Solve array and string problems in linear time using two mov...

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Efficiently process contiguous subarrays with a dynamic wind...

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Sorting Algorithms

From bubble to merge — understand how and why different sort...

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LIFO and FIFO structures powering undo systems, schedulers, ...

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Dynamic data chains. Master insertion, deletion, and reversa...

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Hierarchical structures powering file systems, databases, an...

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Model real-world networks: social graphs, maps, and dependen...

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Dynamic Programming

Break hard problems into overlapping subproblems and cache s...

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Modern & System Design

Algorithms powering today's distributed systems: Bloom Filte...