📘 Top Coding Interview Questions – Must Practice 💼💥

These are commonly asked in coding interviews at companies like Google, Amazon, Microsoft, etc.

✅ 1. Arrays & Strings
🔹 Two Sum
🔹 Kadane’s Algorithm (Max Subarray Sum)
🔹 Longest Substring Without Repeating Characters
🔹 Rotate Matrix / Array

✅ 2. Linked Lists
🔹 Reverse a Linked List
🔹 Detect Cycle (Floyd’s Algorithm)
🔹 Merge Two Sorted Lists
🔹 Remove N-th Node from End

✅ 3. Stacks & Queues
🔹 Valid Parentheses
🔹 Min Stack
🔹 Implement Queue using Stacks
🔹 Next Greater Element

✅ 4. Trees
🔹 Inorder, Preorder, Postorder Traversals
🔹 Lowest Common Ancestor (LCA)
🔹 Balanced Binary Tree
🔹 Serialize and Deserialize Binary Tree

✅ 5. Heaps
🔹 Kth Largest Element
🔹 Top K Frequent Elements
🔹 Merge K Sorted Lists

✅ 6. Hashing
🔹 Two Sum with HashMap
🔹 Group Anagrams
🔹 Subarray Sum Equals K

✅ 7. Recursion & Backtracking
🔹 N-Queens
🔹 Word Search
🔹 Generate Parentheses
🔹 Subsets & Permutations

✅ 8. Graphs
🔹 Number of Islands
🔹 Clone Graph
🔹 Dijkstra’s Algorithm
🔹 Course Schedule (Topological Sort)

✅ 9. Dynamic Programming
🔹 0/1 Knapsack
🔹 Longest Common Subsequence
🔹 Coin Change
🔹 House Robber

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