Hey there, ready to grind?

75 flashcards across 13 pattern categories. Pick a topic and start building pattern recognition.

Total Cards

Easy

Medium

Hard

Pattern Categories

Organized by algorithm pattern, inspired by the NeetCode 150. Each problem links to LeetCode.

📊8 cards

Arrays & Hashing

Frequency counting, hash maps, and array manipulation

3 Easy5 Med

🎯5 cards

Two Pointers

Converging pointers, fast/slow, and partition techniques

1 Easy3 Med1 Hard

🖼4 cards

Sliding Window

Fixed and variable-size window techniques

1 Easy2 Med1 Hard

📚5 cards

Stack

LIFO structure for matching, parsing, and monotonic patterns

1 Easy3 Med1 Hard

🔍6 cards

Binary Search

Divide and conquer on sorted or monotonic data

1 Easy4 Med1 Hard

🔗6 cards

Linked List

Pointer manipulation, reversal, and cycle detection

3 Easy2 Med1 Hard

🌳9 cards

Trees

Binary trees, BSTs, traversals, and recursive patterns

4 Easy3 Med2 Hard

🏔5 cards

Heap / Priority Queue

Top-K, streaming, and merge patterns

2 Easy2 Med1 Hard

🔀5 cards

Backtracking

Exhaustive search with pruning

4 Med1 Hard

🕸6 cards

Graphs

BFS, DFS, union-find, and topological sort

5 Med1 Hard

🧩8 cards

1-D Dynamic Programming

Optimal substructure with single-dimension state

1 Easy7 Med

⚡4 cards

Greedy

Locally optimal choices that lead to global optima

4 Med

📏4 cards

Intervals

Merge, insert, and scheduling with interval data

1 Easy3 Med