Problem Index

All problems from the Blind 75, Grind 75, Grind 169, NeetCode 150, Amazon Top 50, and Google Top 50 lists. Problems marked 🔒 require a LeetCode Premium subscription.

Use the dropdowns to filter by pattern, list, or status.

Problem	Lists	Status
Two Sum	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Contains Duplicate	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Valid Anagram	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Ransom Note	Grind 75, Grind 169	✅ Covered
Majority Element	Grind 75, Grind 169	✅ Covered
Longest Palindrome	Grind 75, Grind 169	⬜ Missing
Group Anagrams	Blind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Top K Frequent Elements	Blind 75, NeetCode 150, Google Top 50	⬜ Missing
Product of Array Except Self	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Encode and Decode Strings	Blind 75, Grind 169, NeetCode 150	🔒 Premium
Longest Consecutive Sequence	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Valid Sudoku	Grind 169, NeetCode 150	✅ Covered
Valid Palindrome	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
3Sum	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Container With Most Water	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Sort Colors	Grind 75, Grind 169	⬜ Missing
Two Sum II	NeetCode 150	✅ Covered
Trapping Rain Water	Grind 75, Grind 169, NeetCode 150, Amazon Top 50, Google Top 50	⬜ Missing
Best Time to Buy and Sell Stock	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Longest Substring Without Repeating Characters	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Find All Anagrams in a String	Grind 75, Grind 169	⬜ Missing
Longest Repeating Character Replacement	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Minimum Window Substring	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Permutation in String	NeetCode 150	⬜ Missing
Sliding Window Maximum	Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Valid Parentheses	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Implement Queue using Stacks	Grind 75, Grind 169	⬜ Missing
Min Stack	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Evaluate Reverse Polish Notation	Grind 75, Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Basic Calculator	Grind 75, Grind 169, Google Top 50	⬜ Missing
Generate Parentheses	Grind 169, NeetCode 150	✅ Covered
Daily Temperatures	Grind 169, NeetCode 150	⬜ Missing
Car Fleet	NeetCode 150	⬜ Missing
Largest Rectangle in Histogram	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Binary Search	Grind 75, Grind 169, NeetCode 150	⬜ Missing
First Bad Version	Grind 75, Grind 169, Google Top 50	⬜ Missing
Find Minimum in Rotated Sorted Array	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Search in Rotated Sorted Array	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Search a 2D Matrix	Grind 169, NeetCode 150	⬜ Missing
Koko Eating Bananas	NeetCode 150	⬜ Missing
Time Based Key-Value Store	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Median of Two Sorted Arrays	Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Reverse Linked List	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Merge Two Sorted Lists	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Middle of the Linked List	Grind 75, Grind 169	⬜ Missing
Reorder List	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Remove Nth Node From End of List	Blind 75, Grind 169, NeetCode 150	✅ Covered
Merge K Sorted Lists	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Linked List Cycle	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Add Two Numbers	Grind 169, NeetCode 150, Google Top 50	✅ Covered
Copy List With Random Pointer	NeetCode 150, Amazon Top 50	⬜ Missing
Find the Duplicate Number	Grind 169, NeetCode 150	⬜ Missing
LRU Cache	Grind 75, Grind 169, NeetCode 150, Amazon Top 50, Google Top 50	✅ Covered
Reverse Nodes in K Group	Grind 169, NeetCode 150	⬜ Missing
Invert Binary Tree	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Maximum Depth of Binary Tree	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Diameter of Binary Tree	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Balanced Binary Tree	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Same Tree	Blind 75, Grind 169, NeetCode 150	✅ Covered
Subtree of Another Tree	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Lowest Common Ancestor of a BST	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Lowest Common Ancestor of Binary Tree	Grind 75, Grind 169	⬜ Missing
Binary Tree Level Order Traversal	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Binary Tree Right Side View	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Validate Binary Search Tree	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Kth Smallest Element in a BST	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Construct Binary Tree from Preorder and Inorder Traversal	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
Binary Tree Maximum Path Sum	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Serialize and Deserialize Binary Tree	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Count Good Nodes in Binary Tree	NeetCode 150	⬜ Missing
Implement Trie (Prefix Tree)	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Design Add and Search Words	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Word Search II	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Find Median from Data Stream	Blind 75, Grind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
K Closest Points to Origin	Grind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Task Scheduler	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Kth Largest Element in a Stream	NeetCode 150	⬜ Missing
Last Stone Weight	NeetCode 150	⬜ Missing
Kth Largest Element in an Array	Grind 169, NeetCode 150	⬜ Missing
Design Twitter	NeetCode 150	⬜ Missing
Combination Sum	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Word Search	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Subsets	Grind 75, Grind 169, NeetCode 150	✅ Covered
Permutations	Grind 75, Grind 169, NeetCode 150	✅ Covered
Letter Combinations of a Phone Number	Grind 75, Grind 169, NeetCode 150	✅ Covered
Subsets II	NeetCode 150	⬜ Missing
Combination Sum II	NeetCode 150	⬜ Missing
Palindrome Partitioning	NeetCode 150	⬜ Missing
N-Queens	Grind 169, NeetCode 150	⬜ Missing
Number of Islands	Blind 75, Grind 75, Grind 169, NeetCode 150, Amazon Top 50, Google Top 50	⬜ Missing
Flood Fill	Grind 75, Grind 169	⬜ Missing
01 Matrix	Grind 75, Grind 169	⬜ Missing
Clone Graph	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Rotting Oranges	Grind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Accounts Merge	Grind 75, Grind 169	⬜ Missing
Minimum Height Trees	Grind 75, Grind 169	⬜ Missing
Pacific Atlantic Water Flow	Blind 75, Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Course Schedule	Blind 75, Grind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Graph Valid Tree	Blind 75, Grind 169, NeetCode 150	🔒 Premium
Number of Connected Components	Blind 75, Grind 169, NeetCode 150	🔒 Premium
Max Area of Island	NeetCode 150, Google Top 50	⬜ Missing
Surrounded Regions	NeetCode 150	⬜ Missing
Walls and Gates	NeetCode 150	🔒 Premium
Course Schedule II	Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Redundant Connection	NeetCode 150	⬜ Missing
Word Ladder	Grind 75, Grind 169, NeetCode 150, Amazon Top 50	⬜ Missing
Alien Dictionary	Blind 75, Grind 169, NeetCode 150	🔒 Premium
Reconstruct Itinerary	NeetCode 150	⬜ Missing
Min Cost to Connect All Points	NeetCode 150	⬜ Missing
Network Delay Time	NeetCode 150	⬜ Missing
Swim in Rising Water	NeetCode 150	⬜ Missing
Cheapest Flights Within K Stops	Grind 169, NeetCode 150	⬜ Missing
Climbing Stairs	Blind 75, Grind 75, Grind 169, NeetCode 150	✅ Covered
House Robber	Blind 75, Grind 169, NeetCode 150	⬜ Missing
House Robber II	Blind 75, NeetCode 150, Google Top 50	⬜ Missing
Longest Palindromic Substring	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Decode Ways	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Coin Change	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Maximum Product Subarray	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Word Break	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Longest Increasing Subsequence	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Palindromic Substrings	Blind 75, NeetCode 150	⬜ Missing
Min Cost Climbing Stairs	NeetCode 150	⬜ Missing
Partition Equal Subset Sum	Grind 75, Grind 169, NeetCode 150	⬜ Missing
Unique Paths	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Longest Common Subsequence	Blind 75, NeetCode 150	⬜ Missing
Maximum Profit in Job Scheduling	Grind 75, Grind 169	⬜ Missing
Regular Expression Matching	NeetCode 150, Google Top 50	⬜ Missing
Best Time to Buy and Sell Stock with Cooldown	NeetCode 150	⬜ Missing
Coin Change II	NeetCode 150	⬜ Missing
Target Sum	NeetCode 150	⬜ Missing
Interleaving String	NeetCode 150	⬜ Missing
Longest Increasing Path in a Matrix	Grind 169, NeetCode 150	⬜ Missing
Distinct Subsequences	NeetCode 150	⬜ Missing
Edit Distance	NeetCode 150	⬜ Missing
Burst Balloons	NeetCode 150	⬜ Missing
Maximum Subarray	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Jump Game	Blind 75, Grind 169, NeetCode 150	✅ Covered
Gas Station	Grind 169, NeetCode 150	✅ Covered
Jump Game II	NeetCode 150	⬜ Missing
Hand of Straights	NeetCode 150	⬜ Missing
Merge Triplets to Form Target Triplet	NeetCode 150	⬜ Missing
Partition Labels	NeetCode 150	⬜ Missing
Valid Parenthesis String	NeetCode 150	⬜ Missing
Insert Interval	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	⬜ Missing
Merge Intervals	Blind 75, Grind 75, Grind 169, NeetCode 150, Google Top 50	✅ Covered
Non-overlapping Intervals	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Meeting Rooms	Blind 75, Grind 169, NeetCode 150	🔒 Premium
Meeting Rooms II	Blind 75, Grind 169, NeetCode 150, Amazon Top 50, Google Top 50	🔒 Premium
Minimum Interval to Include Each Query	NeetCode 150	⬜ Missing
Rotate Image	Blind 75, Grind 169, NeetCode 150	✅ Covered
Spiral Matrix	Blind 75, Grind 75, Grind 169, NeetCode 150	⬜ Missing
Set Matrix Zeroes	Blind 75, Grind 169, NeetCode 150	✅ Covered
Add Binary	Grind 75, Grind 169	✅ Covered
String to Integer (atoi)	Grind 75, Grind 169	✅ Covered
Happy Number	NeetCode 150, Google Top 50	✅ Covered
Plus One	NeetCode 150	⬜ Missing
Pow(x, n)	Grind 169, NeetCode 150	✅ Covered
Multiply Strings	NeetCode 150	⬜ Missing
Detect Squares	NeetCode 150	⬜ Missing
Sum of Two Integers	Blind 75, NeetCode 150	⬜ Missing
Number of 1 Bits	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Counting Bits	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Reverse Bits	Blind 75, Grind 169, NeetCode 150	⬜ Missing
Missing Number	Blind 75, Grind 169, NeetCode 150	✅ Covered
Single Number	Grind 169, NeetCode 150	⬜ Missing
Reverse Integer	Grind 169, NeetCode 150	✅ Covered
Move Zeroes	Grind 169	⬜ Missing
Squares of a Sorted Array	Grind 169	⬜ Missing
Rotate Array	Grind 169	⬜ Missing
Contiguous Array	Grind 169	⬜ Missing
Subarray Sum Equals K	Grind 169, Google Top 50	⬜ Missing
3Sum Closest	Grind 169	⬜ Missing
Maximal Square	Grind 169	⬜ Missing
Combination Sum IV	Grind 169	⬜ Missing
Shortest Path to Get Food	Grind 169	🔒 Premium
Minimum Knight Moves	Grind 169	🔒 Premium
Bus Routes	Grind 169	⬜ Missing
Employee Free Time	Grind 169	🔒 Premium
Palindrome Linked List	Grind 169	✅ Covered
Swap Nodes in Pairs	Grind 169	⬜ Missing
Odd Even Linked List	Grind 169	⬜ Missing
Sort List	Grind 169	✅ Covered
Rotate List	Grind 169	⬜ Missing
Sudoku Solver	Grind 169	⬜ Missing
Backspace String Compare	Grind 169	⬜ Missing
Decode String	Grind 169, Google Top 50	⬜ Missing
Asteroid Collision	Grind 169	⬜ Missing
Basic Calculator II	Grind 169	⬜ Missing
Maximum Frequency Stack	Grind 169	⬜ Missing
Longest Valid Parentheses	Grind 169	⬜ Missing
Longest Common Prefix	Grind 169, Google Top 50	✅ Covered
Largest Number	Grind 169	⬜ Missing
Palindrome Pairs	Grind 169	⬜ Missing
Convert Sorted Array to Binary Search Tree	Grind 169	✅ Covered
Symmetric Tree	Grind 169	✅ Covered
Path Sum II	Grind 169	⬜ Missing
Maximum Width of Binary Tree	Grind 169	⬜ Missing
Binary Tree Zigzag Level Order Traversal	Grind 169	✅ Covered
Path Sum III	Grind 169	⬜ Missing
All Nodes Distance K in Binary Tree	Grind 169, Amazon Top 50	⬜ Missing
Inorder Successor in BST	Grind 169	🔒 Premium
Design Hit Counter	Grind 169	🔒 Premium
Design In-Memory File System	Grind 169, Amazon Top 50	🔒 Premium
Insert Delete GetRandom O(1)	Grind 169	✅ Covered
First Missing Positive	Grind 169	⬜ Missing
Top K Frequent Words	Grind 169	⬜ Missing
Find K Closest Elements	Grind 169	⬜ Missing
Smallest Range Covering Elements from K Lists	Grind 169	⬜ Missing
Next Permutation	Grind 169	⬜ Missing
Roman to Integer	Grind 169, Google Top 50	✅ Covered
Palindrome Number	Grind 169, Google Top 50	✅ Covered
Random Pick with Weight	Grind 169, Google Top 50	⬜ Missing
Integer to Roman		✅ Covered
Find the Index of the First Occurrence in a String		✅ Covered
Compare Version Numbers		⬜ Missing
Integer to English Words	Amazon Top 50	⬜ Missing
First Unique Character in a String		✅ Covered
Most Common Word		⬜ Missing
Reorder Data in Log Files	Amazon Top 50	⬜ Missing
Word Ladder II		⬜ Missing
Cut Off Trees for Golf Event		⬜ Missing
Design Tic-Tac-Toe	Amazon Top 50	🔒 Premium
Design Search Autocomplete System	Google Top 50	🔒 Premium
Prison Cells After N Days		⬜ Missing
Battleships in a Board	Google Top 50	⬜ Missing
Bulls and Cows	Google Top 50	⬜ Missing
Find Duplicate Subtrees	Google Top 50	⬜ Missing
Find Leaves of Binary Tree	Google Top 50	🔒 Premium
Find Original Array From Doubled Array	Google Top 50	⬜ Missing
Find Winner on a Tic Tac Toe Game	Google Top 50	⬜ Missing
H-Index	Google Top 50	✅ Covered
Logger Rate Limiter	Google Top 50	🔒 Premium
Maximum Points You Can Obtain from Cards	Google Top 50	⬜ Missing
Minimum Time Difference	Google Top 50	⬜ Missing
Number of Matching Subsequences	Google Top 50	⬜ Missing
Snapshot Array	Google Top 50	⬜ Missing
Stock Price Fluctuation	Google Top 50	⬜ Missing
Student Attendance Record II	Google Top 50	⬜ Missing
Text Justification	Google Top 50	⬜ Missing
Time Needed to Inform All Employees	Google Top 50	⬜ Missing
Analyze User Website Visit Pattern	Amazon Top 50	🔒 Premium
Boundary of Binary Tree	Amazon Top 50	🔒 Premium
Build Binary Expression Tree From Infix Expression	Amazon Top 50	🔒 Premium
Concatenated Words	Amazon Top 50	⬜ Missing
Count Unique Characters of All Substrings of a Given String	Amazon Top 50	⬜ Missing
Design an Expression Tree With Evaluate Function	Amazon Top 50	🔒 Premium
Design Parking System	Amazon Top 50	⬜ Missing
Find Good Days to Rob the Bank	Amazon Top 50	⬜ Missing
Find K-th Smallest Pair Distance	Amazon Top 50	⬜ Missing
Find the K-Sum of an Array	Amazon Top 50	⬜ Missing
Find Triangular Sum of an Array	Amazon Top 50	⬜ Missing
Make Array Zero by Subtracting Equal Amounts	Amazon Top 50	⬜ Missing
Maximum Length of Subarray With Positive Product	Amazon Top 50	⬜ Missing
Maximum Number of Books You Can Take	Amazon Top 50	🔒 Premium
Maximum Number of Robots Within Budget	Amazon Top 50	⬜ Missing
Maximum Units on a Truck	Amazon Top 50	⬜ Missing
Minimum Adjacent Swaps to Make a Valid Array	Amazon Top 50	⬜ Missing
Minimum Health to Beat Game	Amazon Top 50	🔒 Premium
Minimum Number of Keypresses	Amazon Top 50	🔒 Premium
Minimum Number of Moves to Make Palindrome	Amazon Top 50	⬜ Missing
Minimum Number of Swaps to Make the Binary String Alternating	Amazon Top 50	⬜ Missing
Number of Ways to Select Buildings	Amazon Top 50	⬜ Missing
Plates Between Candles	Amazon Top 50	⬜ Missing
Race Car	Amazon Top 50	⬜ Missing
Reorganize String	Amazon Top 50	⬜ Missing
Search Suggestions System	Amazon Top 50	⬜ Missing
Sequential Digits	Amazon Top 50	⬜ Missing
Sequentially Ordinal Rank Tracker	Amazon Top 50	⬜ Missing
Substring With Largest Variance	Amazon Top 50	⬜ Missing
Sum of Subarray Ranges	Amazon Top 50	⬜ Missing
Sum of Total Strength of Wizards	Amazon Top 50	⬜ Missing
Total Appeal of A String	Amazon Top 50	⬜ Missing
Word Break II	Amazon Top 50	⬜ Missing