Neetcode 150 | Workbook

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Arrays & Hashing

9

	#	Problem	Tags	Diff	Source
	1	Contains Duplicate	Easy	1	LC
	2	Valid Anagram	Easy	1	LC
	3	Two Sum	Easy	1.5	LC
	4	Group Anagrams	Medium	3	LC
	5	Top K Frequent Elements	Medium	3	LC
	6	Encode and Decode Strings	Medium	3.5	LC
	7	Product of Array Except Self	Medium	3.5	LC
	8	Valid Sudoku	Medium	3	LC
	9	Longest Consecutive Sequence	Medium	4	LC

Two Pointers

5

	#	Problem	Tags	Diff	Source
	1	Valid Palindrome	Easy	1	LC
	2	Two Sum II Input Array Is Sorted	Medium	2	LC
	3	3Sum	Medium	3.5	LC
	4	Container With Most Water	Medium	3	LC
	5	Trapping Rain Water	Hard	5	LC

Sliding Window

6

	#	Problem	Tags	Diff	Source
	1	Best Time to Buy and Sell Stock	Easy	1.5	LC
	2	Longest Substring Without Repeating Characters	Medium	3	LC
	3	Longest Repeating Character Replacement	Medium	3.5	LC
	4	Permutation in String	Medium	3.5	LC
	5	Minimum Window Substring	Hard	5	LC
	6	Sliding Window Maximum	Hard	5	LC

Stack

7

	#	Problem	Tags	Diff	Source
	1	Valid Parentheses	Easy	1.5	LC
	2	Min Stack	Medium	3	LC
	3	Evaluate Reverse Polish Notation	Medium	3	LC
	4	Generate Parentheses	Medium	3.5	LC
	5	Daily Temperatures	Medium	3	LC
	6	Car Fleet	Medium	4	LC
	7	Largest Rectangle in Histogram	Hard	5	LC

Binary Search

7

	#	Problem	Tags	Diff	Source
	1	Binary Search	Easy	1	LC
	2	Search a 2D Matrix	Medium	2.5	LC
	3	Koko Eating Bananas	Medium	3.5	LC
	4	Find Minimum in Rotated Sorted Array	Medium	3.5	LC
	5	Search in Rotated Sorted Array	Medium	4	LC
	6	Time Based Key-Value Store	Medium	3.5	LC
	7	Median of Two Sorted Arrays	Hard	5	LC

Linked List

11

	#	Problem	Tags	Diff	Source
	1	Reverse Linked List	Easy	1.5	LC
	2	Merge Two Sorted Lists	Easy	1.5	LC
	3	Reorder List	Medium	3.5	LC
	4	Remove Nth Node From End of List	Medium	3	LC
	5	Copy List with Random Pointer	Medium	3.5	LC
	6	Add Two Numbers	Medium	3	LC
	7	Linked List Cycle	Easy	1.5	LC
	8	Find the Duplicate Number	Medium	4	LC
	9	LRU Cache	Medium	4.5	LC
	10	Merge K Sorted Lists	Hard	5	LC
	11	Reverse Nodes in k-Group	Hard	5	LC

Trees

15

	#	Problem	Tags	Diff	Source
	1	Invert Binary Tree	Easy	1	LC
	2	Maximum Depth of Binary Tree	Easy	1	LC
	3	Diameter of Binary Tree	Easy	2	LC
	4	Balanced Binary Tree	Easy	2	LC
	5	Same Tree	Easy	1.5	LC
	6	Subtree of Another Tree	Easy	2	LC
	7	Lowest Common Ancestor of a BST	Medium	2.5	LC
	8	Binary Tree Level Order Traversal	Medium	2.5	LC
	9	Binary Tree Right Side View	Medium	3	LC
	10	Count Good Nodes in Binary Tree	Medium	3	LC
	11	Validate Binary Search Tree	Medium	3.5	LC
	12	Kth Smallest Element in a BST	Medium	3	LC
	13	Construct Binary Tree from Preorder and Inorder Traversal	Medium	4	LC
	14	Binary Tree Maximum Path Sum	Hard	5	LC
	15	Serialize and Deserialize Binary Tree	Hard	5	LC

Tries

3

	#	Problem	Tags	Diff	Source
	1	Implement Trie (Prefix Tree)	Medium	3	LC
	2	Design Add and Search Words Data Structure	Medium	3.5	LC
	3	Word Search II	Hard	5	LC

Heap / Priority Queue

7

	#	Problem	Tags	Diff	Source
	1	Kth Largest Element in a Stream	Easy	2	LC
	2	Last Stone Weight	Easy	1.5	LC
	3	K Closest Points to Origin	Medium	3	LC
	4	Kth Largest Element in an Array	Medium	3.5	LC
	5	Task Scheduler	Medium	4	LC
	6	Design Twitter	Medium	4	LC
	7	Find Median from Data Stream	Hard	5	LC

Backtracking

9

	#	Problem	Tags	Diff	Source
	1	Subsets	Medium	3	LC
	2	Combination Sum	Medium	3	LC
	3	Permutations	Medium	3	LC
	4	Subsets II	Medium	3.5	LC
	5	Combination Sum II	Medium	3.5	LC
	6	Word Search	Medium	3.5	LC
	7	Palindrome Partitioning	Medium	3.5	LC
	8	Letter Combinations of a Phone Number	Medium	3	LC
	9	N-Queens	Hard	5	LC

Graphs

13

	#	Problem	Tags	Diff	Source
	1	Number of Islands	Medium	3	LC
	2	Clone Graph	Medium	3	LC
	3	Max Area of Island	Medium	3	LC
	4	Pacific Atlantic Water Flow	Medium	3.5	LC
	5	Surrounded Regions	Medium	3.5	LC
	6	Rotting Oranges	Medium	3	LC
	7	Walls and Gates	Medium	3	LC
	8	Course Schedule	Medium	3.5	LC
	9	Course Schedule II	Medium	3.5	LC
	10	Redundant Connection	Medium	3.5	LC
	11	Number of Connected Components in an Undirected Graph	Medium	3	LC
	12	Graph Valid Tree	Medium	3.5	LC
	13	Word Ladder	Hard	4.5	LC

Advanced Graphs

6

	#	Problem	Tags	Diff	Source
	1	Reconstruct Itinerary	Hard	4.5	LC
	2	Min Cost to Connect All Points	Medium	4	LC
	3	Network Delay Time	Medium	4	LC
	4	Swim in Rising Water	Hard	4.5	LC
	5	Alien Dictionary	Hard	4.5	LC
	6	Cheapest Flights Within K Stops	Medium	4.5	LC

1-D Dynamic Programming

12

	#	Problem	Tags	Diff	Source
	1	Climbing Stairs	Easy	1.5	LC
	2	Min Cost Climbing Stairs	Easy	2	LC
	3	House Robber	Medium	3	LC
	4	House Robber II	Medium	3.5	LC
	5	Longest Palindromic Substring	Medium	3.5	LC
	6	Palindromic Substrings	Medium	3.5	LC
	7	Decode Ways	Medium	4	LC
	8	Coin Change	Medium	3.5	LC
	9	Maximum Product Subarray	Medium	3.5	LC
	10	Word Break	Medium	4	LC
	11	Longest Increasing Subsequence	Medium	4	LC
	12	Partition Equal Subset Sum	Medium	4	LC

2-D Dynamic Programming

11

	#	Problem	Tags	Diff	Source
	1	Unique Paths	Medium	3	LC
	2	Longest Common Subsequence	Medium	3.5	LC
	3	Best Time to Buy and Sell Stock with Cooldown	Medium	4	LC
	4	Coin Change II	Medium	4	LC
	5	Target Sum	Medium	4	LC
	6	Interleaving String	Medium	4.5	LC
	7	Longest Increasing Path in a Matrix	Hard	4.5	LC
	8	Distinct Subsequences	Hard	4.5	LC
	9	Edit Distance	Medium	4.5	LC
	10	Burst Balloons	Hard	5	LC
	11	Regular Expression Matching	Hard	5	LC

Greedy

8

	#	Problem	Tags	Diff	Source
	1	Maximum Subarray	Medium	2.5	LC
	2	Jump Game	Medium	3.5	LC
	3	Jump Game II	Medium	4	LC
	4	Gas Station	Medium	4	LC
	5	Hand of Straights	Medium	3.5	LC
	6	Merge Triplets to Form Target Triplet	Medium	3.5	LC
	7	Partition Labels	Medium	3.5	LC
	8	Valid Parenthesis String	Medium	4	LC

Intervals

6

	#	Problem	Tags	Diff	Source
	1	Insert Interval	Medium	3.5	LC
	2	Merge Intervals	Medium	3	LC
	3	Non-overlapping Intervals	Medium	3.5	LC
	4	Meeting Rooms	Easy	2	LC
	5	Meeting Rooms II	Medium	3.5	LC
	6	Minimum Interval to Include Each Query	Hard	5	LC

Math & Geometry

8

	#	Problem	Tags	Diff	Source
	1	Rotate Image	Medium	3.5	LC
	2	Spiral Matrix	Medium	3.5	LC
	3	Set Matrix Zeroes	Medium	3.5	LC
	4	Happy Number	Easy	1.5	LC
	5	Plus One	Easy	1.5	LC
	6	Pow(x, n)	Medium	3.5	LC
	7	Multiply Strings	Medium	4	LC
	8	Detect Squares	Medium	4	LC

Bit Manipulation

7

	#	Problem	Tags	Diff	Source
	1	Single Number	Easy	1.5	LC
	2	Number of 1 Bits	Easy	1.5	LC
	3	Counting Bits	Easy	2.5	LC
	4	Reverse Bits	Easy	2.5	LC
	5	Missing Number	Easy	2	LC
	6	Sum of Two Integers	Medium	4	LC
	7	Reverse Integer	Medium	3	LC