Warm-ups (J1–J2)

The First 30 Marks Practice Problems

Data Structures, Simulation and Ad-hoc (J2–J4)

Lists and maps Simulation Intro to Geometry Ad-hoc insight problems

Strings (J3)

Strings: parsing, transforms, palindromes

Sorting and Greedy (J4)

Sorting and ordering Greedy with sorting

Counting and Casework

Counting and careful casework

Graphs and Search (J5)

Graph representation and traversal Flood fill and multi-source BFS Complete search and recursion

Prefix Sums and Intro DP (J5)

Prefix sums and difference arrays Introduction to dynamic programming Weighted grids and shortest paths

Sorting and Greedy (J4)

Sorting and ordering

common

Work in progress

This module is still being written — the content here is a placeholder. This guide is open source, and contributions are welcome.

Contribute on GitHub — help write this module by opening a pull request.

Strings: parsing, transforms, palindromes

Strings: parsing, transforms, and palindromes, anchored on 2021 J3 *Secret Instructions*, 2015 J3 *Rövarspråket*, and 2019 J3 *Cold Compress*

Greedy with sorting

Greedy with sorting — anchored on 2021 J4 *Arranging Books* and 2025 J4 *Sunny Days*

On this page

Sorting and ordering