Data Structures & Algorithms

Capstone journey

One app · 12 guided projects · Beginner to Expert

Build one real app and carry it all the way to production.

You take the same app (Lexi) through 12 projects, each one solving the pain the last left behind. By the end you have shipped a production-grade system, the kind of portfolio piece that gets interviews.

You start

Search it with a plain scan and measure the pain

You finish

Prove it fast: analyze, benchmark, and ship the library

Beginner4Intermediate4Advanced3Expert1

12 projects · ~64.5h of building · free to preview

Beginner4 projects

Intermediate4 projects

Advanced3 projects

Expert1 project

Capstone journey

Build one real app and carry it all the way to production.

Search it with a plain scan and measure the pain

Index it for instant exact lookups

Sort it and binary-search a range

Walk it recursively and mind the stack

Autocomplete it with a trie

Rank the top results with a heap

Answer multi-word queries with an inverted index

Match phrases with two pointers and a window

Suggest related terms with a graph search

Forgive typos with edit-distance DP

Expand queries with backtracking and a greedy cut

Prove it fast: analyze, benchmark, and ship the library