30-days learning plan to master Data Structures and Algorithms (DSA) and prepare for coding interviews.
### Week 1: Foundations and Basic Data Structures
Day 1-3: Arrays and Strings
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Topics to Cover:
- Array basics, operations (insertion, deletion, searching)
- String manipulation
- Two-pointer technique, sliding window technique
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Practice Problems:
- Two Sum
- Maximum Subarray
- Reverse a String
- Longest Substring Without Repeating Characters
Day 4-5: Linked Lists
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Topics to Cover:
- Singly linked list, doubly linked list, circular linked list
- Common operations (insertion, deletion, reversal)
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Practice Problems:
- Reverse a Linked List
- Merge Two Sorted Lists
- Remove Nth Node From End of List
Day 6-7: Stacks and Queues
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Topics to Cover:
- Stack operations (push, pop, top)
- Queue operations (enqueue, dequeue)
- Applications (expression evaluation, backtracking, breadth-first search)
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Practice Problems:
- Valid Parentheses
- Implement Stack using Queues
- Implement Queue using Stacks
### Week 2: Advanced Data Structures
Day 8-10: Trees
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Topics to Cover:
- Binary Trees, Binary Search Trees (BST)
- Tree traversal (preorder, inorder, postorder, level order)
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Practice Problems:
- Invert Binary Tree
- Validate Binary Search Tree
- Serialize and Deserialize Binary Tree
Day 11-13: Heaps and Priority Queues
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Topics to Cover:
- Binary heap (min-heap, max-heap)
- Heap operations (insert, delete, extract-min/max)
- Applications (heap sort, priority queues)
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Practice Problems:
- Kth Largest Element in an Array
- Top K Frequent Elements
- Find Median from Data Stream
Day 14: Hash Tables
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Topics to Cover:
- Hashing concept, hash functions, collision resolution (chaining, open addressing)
- Applications (caching, counting frequencies)
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Practice Problems:
- Two Sum (using hash map)
- Group Anagrams
- Subarray Sum Equals K
### Week 3: Algorithms
Day 15-17: Sorting and Searching Algorithms
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Topics to Cover:
- Sorting algorithms (quick sort, merge sort, bubble sort, insertion sort)
- Searching algorithms (binary search, linear search)
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Practice Problems:
- Merge Intervals
- Search in Rotated Sorted Array
- Sort Colors
- Find Peak Element
Day 18-20: Recursion and Backtracking
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Topics to Cover:
- Basic recursion, tail recursion
- Backtracking (N-Queens, Sudoku solver)
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Practice Problems:
- Permutations
- Combination Sum
- Subsets
- Word Search
Day 21: Divide and Conquer
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Topics to Cover:
- Basic concept, merge sort, quick sort, binary search
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Practice Problems:
- Median of Two Sorted Arrays
- Pow(x, n)
- Kth Largest Element in an Array (using divide and conquer)
- Maximum Subarray (using divide and conquer)
### Week 4: Graphs and Dynamic Programming
Day 22-24: Graphs
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Topics to Cover:
- Graph representations (adjacency list, adjacency matrix)
- Traversal algorithms (DFS, BFS)
- Shortest path algorithms (Dijkstra's, Bellman-Ford)
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Practice Problems:
- Number of Islands
Day 25-27: Dynamic Programming
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Topics to Cover:
- Basic concept, memoization, tabulation
- Common problems (knapsack, longest common subsequence)
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Practice Problems:
- Longest Increasing Subsequence
- Maximum Product Subarray
Day 28: Advanced Topics and Miscellaneous
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Topics to Cover:
- Bit manipulation
- Greedy algorithms
- Miscellaneous problems (trie, segment tree, disjoint set)
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Practice Problems:
- Single Number
- Decode Ways
- Minimum Spanning Tree
### Week 5: Review and Mock Interviews
Day 29: Review and Weakness Analysis
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Activities:
- Review topics you found difficult
- Revisit problems you struggled with
Day 30: Mock Interviews and Practice
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Activities:
- Conduct mock interviews with a friend or use online platforms
- Focus on communication and explaining your thought process
Top DSA resources to crack coding interview
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GeekforGeeks
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Leetcode
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DSA Steps
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FreeCodeCamp
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Coding Interviews
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Best DSA Resources
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ENJOY LEARNING ๐๐