⚡ DSA Cheatsheet — Java
Quick-reference tables grouped by category — Fundamentals → Data Structures → Algorithm Patterns
🎯 Pattern Radar
Read the problem → identify keywords → pick the right pattern. Used for first-2-minute decisions in interviews.
📋 Interview Templates
Ready-to-write code for structures you must implement manually. Memorize these — they appear in almost every interview.
⚠️ Java Pitfalls
Things that compile fine, run silently wrong, or throw unexpected exceptions in interviews. Know all of these.
🔁 Recursion → Iteration
Interviewers often ask: "Can you do this iteratively?" Here's every major conversion pattern with side-by-side code.