NeetCode 150

Problems

A full interview prep map grouped by pattern, with local mock prompts ready to open while the backend catches up.

150

Total problems

18

Pattern tracks

28

Easy

100

Medium

22

Hard

All Problems

Contains Duplicate

Arrays & Hashing

Two Sum

Arrays & Hashing

Valid Anagram

Arrays & Hashing

Valid Palindrome

Best Time to Buy and Sell Stock

Valid Parentheses

Binary Search

Linked List Cycle

Merge Two Sorted Lists

Reverse Linked List

Balanced Binary Tree

Diameter of Binary Tree

Invert Binary Tree

Maximum Depth of Binary Tree

Same Tree

Subtree of Another Tree

Kth Largest Element in a Stream

Heap / Priority Queue

Last Stone Weight

Heap / Priority Queue

Climbing Stairs

1-D Dynamic Programming

Min Cost Climbing Stairs

1-D Dynamic Programming

Meeting Rooms

Happy Number

Math & Geometry

Plus One

Math & Geometry

Counting Bits

Bit Manipulation

Missing Number

Bit Manipulation

Number of 1 Bits

Bit Manipulation

Reverse Bits

Bit Manipulation

Single Number

Bit Manipulation

Encode and Decode Strings

Arrays & Hashing

Group Anagrams

Arrays & Hashing

Longest Consecutive Sequence

Arrays & Hashing

Product of Array Except Self

Arrays & Hashing

Top K Frequent Elements

Arrays & Hashing

Valid Sudoku

Arrays & Hashing

3Sum

Container With Most Water

Two Sum II Input Array Is Sorted

Longest Repeating Character Replacement

Longest Substring Without Repeating Characters

Permutation in String

Car Fleet

Daily Temperatures

Evaluate Reverse Polish Notation

Generate Parentheses

Min Stack

Find Minimum in Rotated Sorted Array

Koko Eating Bananas

Search a 2D Matrix

Search in Rotated Sorted Array

Time Based Key-Value Store

Add Two Numbers

Copy List with Random Pointer

Find the Duplicate Number

LRU Cache

Remove Nth Node From End of List

Reorder List

Binary Tree Level Order Traversal

Binary Tree Right Side View

Construct Binary Tree from Preorder and Inorder Traversal

Count Good Nodes in Binary Tree

Kth Smallest Element in a BST

Lowest Common Ancestor of a Binary Search Tree

Validate Binary Search Tree

Design Add and Search Words Data Structure

Implement Trie Prefix Tree

Design Twitter

Heap / Priority Queue

K Closest Points to Origin

Heap / Priority Queue

Kth Largest Element in an Array

Heap / Priority Queue

Task Scheduler

Heap / Priority Queue

Combination Sum

Combination Sum II

Letter Combinations of a Phone Number

Palindrome Partitioning

Permutations

Subsets

Subsets II

Word Search

Clone Graph

Course Schedule

Course Schedule II

Graph Valid Tree

Max Area of Island

Number of Connected Components in an Undirected Graph

Number of Islands

Pacific Atlantic Water Flow

Redundant Connection

Rotting Oranges

Surrounded Regions

Walls and Gates

Cheapest Flights Within K Stops

Advanced Graphs

Min Cost to Connect All Points

Advanced Graphs

Network Delay Time

Advanced Graphs

Coin Change

1-D Dynamic Programming

Decode Ways

1-D Dynamic Programming

House Robber

1-D Dynamic Programming

House Robber II

1-D Dynamic Programming

Longest Increasing Subsequence

1-D Dynamic Programming

Longest Palindromic Substring

1-D Dynamic Programming

Maximum Product Subarray

1-D Dynamic Programming

Palindromic Substrings

1-D Dynamic Programming

Partition Equal Subset Sum

1-D Dynamic Programming

Word Break

1-D Dynamic Programming

Best Time to Buy and Sell Stock with Cooldown

2-D Dynamic Programming

Coin Change II

2-D Dynamic Programming

Interleaving String

2-D Dynamic Programming

Longest Common Subsequence

2-D Dynamic Programming

Target Sum

2-D Dynamic Programming

Unique Paths

2-D Dynamic Programming

Gas Station

Hand of Straights

Jump Game

Jump Game II

Maximum Subarray

Merge Triplets to Form Target Triplet

Partition Labels

Valid Parenthesis String

Insert Interval

Meeting Rooms II

Merge Intervals

Non-overlapping Intervals

Detect Squares

Math & Geometry

Multiply Strings

Math & Geometry

Pow(x, n)

Math & Geometry

Rotate Image

Math & Geometry

Set Matrix Zeroes

Math & Geometry

Spiral Matrix

Math & Geometry

Reverse Integer

Bit Manipulation

Sum of Two Integers

Bit Manipulation

Trapping Rain Water

Minimum Window Substring

Sliding Window Maximum

Largest Rectangle in Histogram

Median of Two Sorted Arrays

Merge k Sorted Lists

Reverse Nodes in k-Group

Binary Tree Maximum Path Sum

Serialize and Deserialize Binary Tree

Word Search II

Find Median from Data Stream

Heap / Priority Queue

N-Queens

Word Ladder

Alien Dictionary

Advanced Graphs

Reconstruct Itinerary

Advanced Graphs

Swim in Rising Water

Advanced Graphs

Burst Balloons

2-D Dynamic Programming

Distinct Subsequences

2-D Dynamic Programming

Edit Distance

2-D Dynamic Programming

Longest Increasing Path in a Matrix

2-D Dynamic Programming

Regular Expression Matching

2-D Dynamic Programming

Minimum Interval to Include Each Query