Prep Hub
Everything for systems interviews and competitive programming in one place. Read the C++ and language-internals guides, drill MCQs, revise CP patterns and track what you've solved.
C++ / OS Guide
C++ internals, operating systems and networking for interviews, with traps, drills and mock rounds.
Language Internals
How CPython, the JVM, the Go runtime and the Rust compiler work underneath, with programs you can run and interview drills.
MCQ Prep
Practice by subject and difficulty, review mistakes, and take timed mock tests with full explanations.
CP Atlas
Data structure → algorithm → variant, with recognition signals, tested templates and a review queue for solved problems.
Ladder
Codeforces 2000–2400 ladder, the hard DP/trees/graphs drill, segment tree & BIT practice and a PYQ tracker.
Practice Counter
Count problems solved on LeetCode, Codeforces, AtCoder and CSES, synced to a private GitHub Gist.