DSA Preparation: Complete Roadmap

## DSA is Non-Negotiable For product companies (Google, Amazon, Microsoft, Flipkart, etc.), DSA is the primary filter. You need to solve problems efficiently under time pressure. ## Preparation Order ### Phase 1: Basics (2-3 weeks) - Arrays, Strings - Basic Sorting (Bubble, Selection, Insertion) - Time/Space Complexity (Big O) - Recursion basics ### Phase 2: Core (4-6 weeks) - Linked Lists - Stacks & Queues - Trees (BST, traversals) - Hashing (HashMap, HashSet) - Binary Search - Two Pointers - Sorting (Merge, Quick) ### Phase 3: Advanced (4-6 weeks) - Graphs (BFS, DFS, shortest path) - Dynamic Programming - Greedy algorithms - Backtracking - Tries - Segment Trees (optional) ## Daily Practice - Solve 2-3 problems daily - Mix: 1 easy + 1 medium + attempt 1 hard - Review solutions you couldn't solve - Maintain a patterns notebook