~/roadmap

Roadmap

Start at the top and work down: each topic builds on the ones above it. Colour shows how well you know it, from every problem, quiz and "which technique?" you answer.

not started shaky getting there solid

Algos 75 0/75

The essentials: one pass through every interview topic, the problems that come up again and again.

Up next: Two Sum

Algos 150 0/150

Algos 75 plus the next tier of classics, company-style assessments, and the practical, concurrency and quant staples.

Up next: Two Sum

Interview roadmap

The core of coding interviews, in the order that builds on itself. Start at the top.

Arrays & hashing 0/38

Two pointers 0/14 Stacks 0/24 Math & matrices 0/9

Sliding window 0/13 Binary search 0/42 Linked lists 0/19

Trees 0/34

Tries 0/10 Heaps 0/23 Backtracking 0/19

Intervals 0/14 Greedy 0/21 Graphs 0/50 1-D dynamic programming 0/23

Weighted graphs 0/21 2-D dynamic programming 0/32 Bit manipulation 0/14

Practical systems

What company online assessments actually ask: build a small working system, level by level.

Simulation & OOP design 0/49 Stateful stores 0/16 Iterators & parsers 0/18 Streams & durability 0/16 Files & networks 0/6

Concurrency

Threads that share state safely: the other half of many systems interviews.

Locks 0/12 Coordination 0/12 Pools & pipelines 0/10

Quant & trading

For trading firms: probability, randomness and exchange mechanics.

Probability 0/18 Trading systems 0/9

Plus mental math and probability puzzles.

Advanced & competitive

Competitive-programming techniques. Rare in interviews; here when you want them.

Range queries 0/12 Tree techniques 0/8 More shortest paths 0/6 Advanced DP 0/11 Search tricks 0/10 String hashing 0/6 Number theory 0/18 Counting 0/9 Geometry 0/5