Himanshi on Instagram: "1. Master the Fundamentals 📚 Before jumping into complex problems, build a strong foundation in these core topics: * Arrays & Strings – Sliding Window, Two Pointers, Kadane’s Algorithm * Linked Lists – Reversal, Cycle Detection, Merge Two Lists * Stacks & Queues – Next Greater Element, LRU Cache * Recursion & Backtracking – Subset Generation, N-Queens, Permutations * Hashing – Hash Maps, Frequency Counting, Anagrams * Trees & Graphs – BFS, DFS, Dijkstra’s Algorithm, Bina