README.md

NeetCode roadmap

The NeetCode roadmap is a super useful guide designed to help you master coding interviews. It lays out a clear, step-by-step plan to learn important data structures and algorithms, starting from beginner-friendly concepts and working up to more advanced ones. The idea is to give you a structured path to follow, with curated problems from LeetCode that you can practice along the way.

All credit to Navdeep Singh.
Thank you 🙏 Navdeep for your work !

https://neetcode.io/roadmap

graph TD
    A(Arrays & Hashing)
    A --> C(Two Pointers)
    A --> E(Stack)
    C --> F(Binary Search)
    C --> D[Sliding Window]
    C --> G(Linked List)
    G --> H(Trees)
    F --> H
    H --> J[Heap & Priority Queue]
    J --> S(Intervals)
    J --> N(Greedy)
    J --> M(Advanced Graphs)
    K --> L[Graphs]
    H --> I(Tries)
    H --> K[Backtracking]
    K --> O(1-D DP)
    O --> P
    L --> M
    L --> R(Math & Geometry)
    L --> P(2-P DP)
    O --> Q(Bit Manipulation)
    Q --> R

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Problems

Arrays & Hashing

Problem	Difficulty	Python Module
Contains Duplicate	Easy	contains_duplicate.py
Valid Anagram	Easy	valid_anagram.py
Two Sum	Easy	two_sum.py
Group Anagrams	Medium	group_anagrams.py
Top K Frequent Elements	Medium	top_k_frequent_elements.py
Encode and Decode Strings	Medium	encode_decode_strings.py
Product of Array Except Self	Medium	product_of_array_except_self.py
Valid Sudoku	Medium	valid_sudoku.py
Longest Consecutive Sequence	Medium	longest_consecutive_sequence.py

Stack

Problem	Difficulty	Python Module
Valid Parentheses	Easy	valid_parentheses.py
Min Stack	Medium	min_stack.py
Evaluate Reverse Polish Notation	Medium	evaluate_reverse_polish_notation.py
Generate Parentheses	Medium	generate_parentheses.py
Daily Temperatures	Medium	daily_temperatures.py
Car Fleet	Medium	car_fleet.py
Largest Rectangle In Histogram	Hard	largest_rectangle.py

Two Pointers

Problem	Difficulty	Local Code Link
Valid Palindrome	Easy	valid_palindrome.py
Two Sum II - Input Array Is Sorted	Medium	two_sum_ii.py
3Sum	Medium	three_sum.py
Container With Most Water	Medium	container_with_most_water.py
Trapping Rain Water	Hard	trapping_rain_water.py

Binary Search

Problem	Difficulty	Local Code Link
Binary Search	Easy	binary_search.py
Search a 2D Matrix	Medium	search_2d_matrix.py
Koko Eating Bananas	Medium	koko_eating_bananas.py
Find Minimum In Rotated Sorted Array	Medium	find_min_in_rotated_sorted_array.py
Search In Rotated Sorted Array	Medium	search_in_rotated_sorted_array.py
Time Based Key Value Store	Medium	time_based_key_value_store.py
Median of Two Sorted Arrays	Hard	median_of_two_sorted_arrays.py

Sliding Window

Problem	Difficulty	Local Code Link
Best Time to Buy And Sell Stock	Easy	buy_sell.py
Longest Substring Without Repeating Characters	Medium	longest_substring_without_repeating_characters.py
Longest Repeating Character Replacement	Medium	longest_repeating_character_replacement.py
Permutation In String	Medium	permutation_in_string.py
Minimum Window Substring	Hard	minimum_window_substring.py
Sliding Window Maximum	Hard	sliding_window_maximum.py

Linked List

Problem	Difficulty	Local Code Link
Reverse Linked List	Easy	reverse_linked_list.py
Merge Two Sorted Lists	Easy	merge_two_sorted_lists.py
Reorder List	Medium	reorder_list.py
Remove Nth Node From End of List	Medium	remove_nth_node_from_end_of_list.py
Copy List With Random Pointer	Medium	copy_list_with_random_pointer.py
Add Two Numbers	Medium	add_two_numbers.py
Linked List Cycle	Easy	linked_list_cycle.py
Find The Duplicate Number	Medium	find_the_duplicate_number.py
LRU Cache	Medium	lru_cache.py
Merge K Sorted Lists	Hard	merge_k_sorted_lists.py
Reverse Nodes In K Group	Hard	reverse_nodes_in_k_group.py

Trees

Problem	Difficulty	Local Code Link
Invert Binary Tree	Easy	invert_binary_tree.py
Maximum Depth of Binary Tree	Easy	maximum_depth.py
Diameter of Binary Tree	Easy	diameter_of_binary_tree.py
Balanced Binary Tree	Easy	balanced_binary_tree.py
Same Tree	Easy	same_tree.py
Subtree of Another Tree	Easy	subtree_of_another_tree.py
Lowest Common Ancestor of a Binary Search Tree	Medium	lowest_common_ancestor.py
Binary Tree Level Order Traversal	Medium	levelorder_traversal.py
Binary Tree Right Side View	Medium	binary_tree_right_side_view.py
Count Good Nodes in Binary Tree	Medium	count_good_nodes_in_binary_tree.py
Validate Binary Search Tree	Medium	valid_tree.py
Kth Smallest Element in a BST	Medium	kth_smallest_element_in_a_bst.py
Construct Binary Tree from Preorder and Inorder Traversal	Medium	construct_binary_tree.py
Binary Tree Maximum Path Sum	Hard	binary_tree_maximum_path_sum.py
Serialize and Deserialize Binary Tree	Hard	serialize_and_deserialize_binary_tree.py