Question 1

What is the Leetcode Pattern Tracker?

Accepted Answer

It is a free web app that organizes Leetcode-style problems into 24+ DSA patterns such as Sliding Window, Two Pointers, Binary Search, DFS, BFS, Backtracking, Dijkstra, and Union-Find, and lets you track which problems you have solved.

Question 2

Do I need an account to use it?

Accepted Answer

No. Progress is stored locally in your browser using localStorage, so you can use it instantly with no sign-up.

Question 3

Which patterns are covered?

Accepted Answer

Sliding Window, Two Pointers, Prefix Sum, Hash Map, Sorting + Greedy, Binary Search, Binary Search on Answer, Monotonic Stack, Monotonic Queue, Heap / Priority Queue, Difference Array, Sweep Line, DFS on Trees, BFS on Trees, Binary Search Tree, Recursion, Backtracking, Graph BFS, Graph DFS, Topological Sort, Cycle Detection, Trie, Union-Find (DSU), and Dijkstra / Shortest Path.

Question 4

Is it free?

Accepted Answer

Yes, it is completely free and open source on GitHub.