Algorithms & Data Structures

Big-O time/space complexity

Recursion basics

Sorting & searching overview

Two pointers / sliding window patterns

Basic math for coding interviews

Arrays & strings

Stacks & queues

Hash maps/sets

Linked lists basics

Heaps/priority queues overview

Binary trees traversal

BST basics

Trie overview

Segment tree overview

Tree problems practice set

BFS/DFS

Topological sort overview

Shortest paths overview

Union-find overview

Graph problems practice set

Memoization vs tabulation

Common DP patterns

Knapsack overview

LCS/LIS overview

DP problems practice set