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42+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes interview approach framework, recursion basics, frequency counting, two pointers, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Problem-solving patterns (fresher level) introduces the DSA patterns a junior interview expects. This module is an elevation arc: it opens with the interview-approach framework (how to attack a problem), then recursion (the foundation for several patterns). Frequency counting, two pointers, and sliding window follow as the core patterns, then backtracking and dynamic programming intros at the advanced tier. Common fresher programs close the module.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–42 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–42 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q42.