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Amazon Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real Amazon interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

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1938
Kth Smallest Element in a Sorted Matrix
Find Servers That Handled Most Number of Requests
Dota2 Senate
Minimum Additions to Make Valid String
Double Modular Exponentiation
Inorder Successor in BST
Subarray Product Less Than K6 Months
Word Ladder II6 Months
N-Queens II6 Months
Knight Probability in Chessboard
Insert Delete GetRandom O(1) - Duplicates allowed6 Months
Minimum Penalty for a Shop3 Months
Maximize Area of Square Hole in Grid3 Months
Number of Connected Components in an Undirected Graph6 Months
Asteroid Collision30 Days
Grumpy Bookstore Owner
Active Users
Open the Lock30 Days
Snapshot Array6 Months
Validate IP Address
Find the Length of the Longest Common Prefix
Escape a Large Maze
Design HashMap6 Months
Permutation Sequence30 Days
K-th Smallest Prime Fraction
Majority Element II6 Months
String Compression II
Count Number of Ways to Place Houses6 Months
Divide an Array Into Subarrays With Minimum Cost II30 Days
Length of Longest V-Shaped Diagonal Segment6 Months
Jump Game II3 Months
Rotating the Box
Find the Closest Palindrome
Walking Robot Simulation
Difference Between Element Sum and Digit Sum of an Array
Longest Univalue Path
Reverse Prefix of Word
Minimized Maximum of Products Distributed to Any Store
Determine if Two Strings Are Close
Minimum Number of Steps to Make Two Strings Anagram
Minimum Score of a Path Between Two Cities
Sort Integers by The Number of 1 Bits
Count Good Triplets
Find Greatest Common Divisor of Array
Maximum XOR After Operations
Design A Leaderboard
Longest Subarray of 1's After Deleting One Element
Longest Happy String
Score After Flipping Matrix
Number of People Aware of a Secret6 Months
Furthest Building You Can Reach6 Months
Operations on Tree
Market Analysis I
Non-negative Integers without Consecutive Ones
Reverse Linked List3 Months
Design Tic-Tac-Toe6 Months
String Without AAA or BBB
Minimum Height Trees6 Months
Find a Peak Element II6 Months
Best Sightseeing Pair
Print Binary Tree
Distribute Elements Into Two Arrays I
Count Unguarded Cells in the Grid
Day of the Year
User Activity for the Past 30 Days I
Max Stack
Max Difference You Can Get From Changing an Integer
Longest Nice Subarray3 Months
Minimum ASCII Delete Sum for Two Strings
Minimum Number of Operations to Sort a Binary Tree by Level
Sort Matrix by Diagonals
Finding the Users Active Minutes
Reachable Nodes In Subdivided Graph
Minimum Operations to Make Array Equal
Special Array II
Most Beautiful Item for Each Query6 Months
Minimum Index Sum of Two Lists3 Months
Process Tasks Using Servers
Pseudo-Palindromic Paths in a Binary Tree
Partitioning Into Minimum Number Of Deci-Binary Numbers
Jump Game III
Maximum Side Length of a Square with Sum Less than or Equal to Threshold3 Months
Maximum Fruits Harvested After at Most K Steps
Minimum Subsequence in Non-Increasing Order
Game Play Analysis II
Minimum Difficulty of a Job Schedule
Shortest Uncommon Substring in an Array
Min Stack3 Months
Meeting Rooms II3 Months
Minimum Genetic Mutation
Product's Price for Each Store
Largest Magic Square3 Months
Minimize Maximum of Array
Maximum Tastiness of Candy Basket
Special Binary String
Paint House IV
Minimum Distance to the Target Element
Shortest Subarray With OR at Least K II
Count Operations to Obtain Zero6 Months
Number of Valid Subarrays
Valid Parentheses30 Days
Check If a Word Occurs As a Prefix of Any Word in a Sentence
Destination City
Find Followers Count3 Months
Range Addition II
Fruits Into Baskets II
Best Meeting Point
Minimum Moves to Reach Target Score
Second Highest Salary30 Days
Using a Robot to Print the Lexicographically Smallest String
Longest Substring Of All Vowels in Order
Design SQL
Maximum Length of Subarray With Positive Product
Minimum Value to Get Positive Step by Step Sum
Maximum Subarray Sum with One Deletion
Vowel Spellchecker6 Months
Spiral Matrix30 Days
Minimum Number of Swaps to Make the Binary String Alternating
Graph Valid Tree
Linked List in Binary Tree
Minimum Bit Flips to Convert Number
Count the Number of Arrays with K Matching Adjacent Elements
Top K Frequent Words3 Months
Brick Wall
Avoid Flood in The City6 Months
Minimum Deletions to Make String Balanced
Shortest Distance from All Buildings
Alternating Groups I
Letter Case Permutation
Find Resultant Array After Removing Anagrams
Delete Characters to Make Fancy String
Customer Placing the Largest Number of Orders
Convert Sorted List to Binary Search Tree
Monthly Transactions I3 Months
Special Array I
Find Closest Number to Zero
Count Visited Nodes in a Directed Graph
Maximum Number of Balloons
Invalid Tweets
Smallest Range Covering Elements from K Lists6 Months
Unique Binary Search Trees30 Days
Course Schedule III6 Months
Investments in 2016
Course Schedule II6 Months
Find Common Characters
Zigzag Conversion30 Days
Customer Who Visited but Did Not Make Any Transactions3 Months
Pacific Atlantic Water Flow6 Months
Trapping Rain Water30 Days
Subarray With Elements Greater Than Varying Threshold
Compare Version Numbers3 Months
Get Maximum in Generated Array
Unique Email Addresses
Remove Sub-Folders from the Filesystem
The Number of Employees Which Report to Each Employee6 Months
Two Out of Three
Shortest Word Distance
Sum of Perfect Square Ancestors6 Months
Number of Days Between Two Dates
Merge Intervals30 Days
Path Sum III
Product of Array Except Self3 Months
Sort the Students by Their Kth Score
Maximum Sum Circular Subarray
Koko Eating Bananas30 Days
Unique Morse Code Words3 Months
Count the Hidden Sequences
Find K Closest Elements3 Months
Minimum Number of Days to Make m Bouquets30 Days
Find Original Array From Doubled Array6 Months
Binary Number with Alternating Bits3 Months
Kth Smallest Element in a BST6 Months
Shopping Offers
Divide Intervals Into Minimum Number of Groups
Design Spreadsheet
Event Emitter
Climbing Stairs30 Days
Maximize Distance to Closest Person
Alien Dictionary30 Days
Non-decreasing Subsequences
Partition Array Into Two Arrays to Minimize Sum Difference6 Months
Encode and Decode Strings
Power of Four
Serialize and Deserialize Binary Tree3 Months
Maximum Number of Words You Can Type
Pow(x, n)3 Months
Minimum Number of Coins to be Added
Minimum Operations to Write the Letter Y on a Grid
Palindrome Pairs
Design HashSet
Design a Stack With Increment Operation3 Months
Find Maximum Value in a Constrained Sequence3 Months
Longest Substring Without Repeating Characters30 Days
3Sum With Multiplicity
Copy List with Random Pointer3 Months
All Nodes Distance K in Binary Tree3 Months
Maximum Depth of N-ary Tree
Transpose Matrix6 Months
Distribute Candies Among Children II
Maximum Product Subarray3 Months
Generate Parentheses30 Days
Monotone Increasing Digits
Two City Scheduling
Minimum Deletions to Make Character Frequencies Unique
Split Array Largest Sum30 Days
Next Permutation30 Days
Get Watched Videos by Your Friends
Invalid Transactions
Split BST
Maximize Greatness of an Array
Time Based Key-Value Store30 Days
Battleships in a Board30 Days
Number of Paths with Max Score
Movie Rating6 Months
Maximum Height by Stacking Cuboids
Count Subarrays With Score Less Than K
Minimum Distance Between BST Nodes
Building H2O
Clone Graph3 Months
Count Zero Request Servers6 Months
Construct Quad Tree
Find Numbers with Even Number of Digits
Find the Longest Balanced Substring of a Binary String
Managers with at Least 5 Direct Reports30 Days
Substring with Concatenation of All Words
Minimum Cost For Tickets
Finding Pairs With a Certain Sum
Maximum Depth of Binary Tree6 Months
Find Closest Node to Given Two Nodes
Optimal Account Balancing
Create Target Array in the Given Order
Maximum Distance in Arrays
Describe the Painting
Maximum Score of Non-overlapping Intervals
Baseball Game
Button with Longest Push Time
Count Salary Categories3 Months
Longest Harmonious Subsequence6 Months
Longest Palindromic Substring30 Days
Search Suggestions System6 Months
Binary Tree Paths
Maximum Product of Two Elements in an Array
Car Pooling
The Number of the Smallest Unoccupied Chair
Largest 1-Bordered Square
Two Sum IV - Input is a BST3 Months
K Closest Points to Origin6 Months
Verifying an Alien Dictionary
Longest String Chain6 Months
Diameter of Binary Tree3 Months
Minimum Cost to Move Chips to The Same Position
Painting the Walls
Nth Highest Salary6 Months
Count Vowel Strings in Ranges
Number of 1 Bits3 Months
Largest Number3 Months
Remove Boxes
The Number of Beautiful Subsets
Maximum Good Subarray Sum
Find the Distance Value Between Two Arrays
Minimum Non-Zero Product of the Array Elements
Minimum Number of K Consecutive Bit Flips
Rabbits in Forest
Swim in Rising Water6 Months
Design Excel Sum Formula6 Months
Longest Repeating Character Replacement30 Days
Longest Word in Dictionary
Valid Word
Longest Increasing Path in a Matrix3 Months
Regular Expression Matching6 Months
Capacity To Ship Packages Within D Days30 Days
Reverse Nodes in Even Length Groups
Basic Calculator III
Maximum Number of Visible Points
High-Access Employees
Remove All Occurrences of a Substring
Game of Life6 Months
First Unique Number
Check if All the Integers in a Range Are Covered
Wildcard Matching
Maximum Profit in Job Scheduling6 Months
Number of Ways to Form a Target String Given a Dictionary
Maximum Swap
Number of Visible People in a Queue
Count Nodes With the Highest Score
Number of Adjacent Elements With the Same Color
Count Elements With Maximum Frequency6 Months
My Calendar I
Longest Non-decreasing Subarray From Two Arrays
Exchange Seats3 Months
Unique Paths II3 Months
Maximum Length Substring With Two Occurrences
Minimum String Length After Removing Substrings
High Five
Minimum Reverse Operations
Count Ways To Build Good Strings
Collecting Chocolates
Average Time of Process per Machine3 Months
Make Lexicographically Smallest Array by Swapping Elements
Middle of the Linked List3 Months
Maximum Number of Integers to Choose From a Range I
Manhattan Distances of All Arrangements of Pieces
Queue Reconstruction by Height6 Months
Reverse Bits30 Days
Maximize the Minimum Game Score
Number of Ways to Separate Numbers
Find All Anagrams in a String6 Months
Reverse Odd Levels of Binary Tree
Maximum Sum BST in Binary Tree6 Months
Basic Calculator II6 Months
Longest Strictly Increasing or Strictly Decreasing Subarray
Random Pick with Weight30 Days
House Robber III3 Months
Maximum Strength of K Disjoint Subarrays
Parallel Courses III
Stock Price Fluctuation
Find the Array Concatenation Value
Permutation in String30 Days
Minimum Knight Moves
IPO
Minimum Window Substring30 Days
Rotate Image30 Days
Max Chunks To Make Sorted
Group the People Given the Group Size They Belong To
Find Winner on a Tic Tac Toe Game
Find All Numbers Disappeared in an Array6 Months
Count Sub Islands
Sqrt(x)30 Days
Minimum Difference Between Highest and Lowest of K Scores
Merge Two Binary Trees6 Months
Valid Palindrome II30 Days
Maximum Number of Consecutive Values You Can Make
Maximum Number of Tasks You Can Assign6 Months
Task Scheduler30 Days
Find Words That Can Be Formed by Characters
Convert Binary Number in a Linked List to Integer
Students and Examinations6 Months
Divisor Game
Lexicographically Smallest String After Applying Operations6 Months
Analyze User Website Visit Pattern30 Days
Count Subarrays With Median K30 Days
Minimum Length of String After Operations
Maximum Width Ramp
Daily Temperatures3 Months
Valid Sudoku30 Days
Palindrome Partitioning II6 Months
Decoded String at Index
First Missing Positive30 Days
Minimum Number of Operations to Make Arrays Similar
Find the Prefix Common Array of Two Arrays
String Compression30 Days
Max Points on a Line30 Days
The Skyline Problem
Backspace String Compare
Minimum Absolute Difference Between Elements With Constraint
Search in Rotated Sorted Array30 Days
Angle Between Hands of a Clock
Kth Largest Element in a Stream6 Months
Check If It Is a Straight Line
Two Sum II - Input Array Is Sorted3 Months
Max Sum of a Pair With Equal Sum of Digits
Escape the Spreading Fire
Minimum Operations to Make All Array Elements Equal
As Far from Land as Possible
Alice and Bob Playing Flower Game
Combination Sum30 Days
Count Subarrays With Fixed Bounds
Lemonade Change6 Months
Two Sum30 Days
Exclusive Time of Functions30 Days
Roman to Integer3 Months
Palindromic Substrings6 Months
Rotting Oranges30 Days
Rearrange String k Distance Apart
LFU Cache6 Months
Insert Delete GetRandom O(1)6 Months
Count Binary Substrings30 Days
Minimum Number of Refueling Stops6 Months
Longest Common Prefix30 Days
Distribute Candies Among Children III
Restaurant Growth6 Months
Number of Islands30 Days
Average Waiting Time
Valid Number6 Months
Word Search II6 Months
Find the Index of the First Occurrence in a String30 Days
Length of the Longest Alphabetical Continuous Substring
Time Needed to Rearrange a Binary String
Interval List Intersections3 Months
Valid Perfect Square
Sliding Window Median
Count Square Submatrices with All Ones30 Days
Maximal Square3 Months
Logger Rate Limiter3 Months
Guess the Word
Height Checker
Find and Replace Pattern
Find the Minimum Area to Cover All Ones II
Design Parking System3 Months
Split Array into Consecutive Subsequences
Reverse Words in a String30 Days
Detect Cycles in 2D Grid
Check if a Parentheses String Can Be Valid
Maximum Sum of Distinct Subarrays With Length K6 Months
Split Message Based on Limit
Count the Number of Inversions
Successful Pairs of Spells and Potions6 Months
Minimum Cost Path with Edge Reversals30 Days
Partition Array Into Three Parts With Equal Sum
Taking Maximum Energy From the Mystic Dungeon6 Months
Find the Smallest Divisor Given a Threshold3 Months
Linked List Cycle II3 Months
Binary Tree Cameras6 Months
Burst Balloons6 Months
Distribute Candies Among Children I
Merge Sorted Array30 Days
Permutations30 Days
Walls and Gates
Insert Interval3 Months
Shortest Path in Binary Matrix3 Months
Heaters
Web Crawler
Maximum Total Damage With Spell Casting6 Months
Add Binary3 Months
Single Number III
LRU Cache30 Days
Product of the Last K Numbers
Remove K Digits6 Months
Reaching Points
Trapping Rain Water II3 Months
Populating Next Right Pointers in Each Node II
Minimum Rounds to Complete All Tasks
Bus Routes6 Months
Set Matrix Zeroes3 Months
Minimum Edge Reversals So Every Node Is Reachable
Design In-Memory File System
Isomorphic Strings3 Months
Closest Prime Numbers in Range
Pascal's Triangle30 Days
Count and Say3 Months
Find All Possible Recipes from Given Supplies6 Months
Range Sum Query 2D - Immutable3 Months
Partition to K Equal Sum Subsets3 Months
Bitwise ORs of Subarrays
Longest Arithmetic Subsequence3 Months
Shortest Bridge6 Months
Design Circular Queue6 Months
Closest Binary Search Tree Value II
All O`one Data Structure6 Months
Robot Bounded In Circle6 Months
Container With Most Water30 Days
Power Grid Maintenance6 Months
Find The Original Array of Prefix Xor
Fair Candy Swap
Rank Teams by Votes
Design Snake Game
Basic Calculator3 Months
Minimum Space Wasted From Packaging
Longest Valid Parentheses3 Months
Find Distance in a Binary Tree
Single Element in a Sorted Array30 Days
Restore IP Addresses3 Months
Last Person to Fit in the Bus
Count the Digits That Divide a Number
Move Zeroes30 Days
Search a 2D Matrix II30 Days
Course Schedule30 Days
Making A Large Island3 Months
Longest Common Subsequence6 Months
Excel Sheet Column Number
Serialize and Deserialize BST6 Months
Number of Ways to Select Buildings
Snakes and Ladders
Maximum Number of Robots Within Budget
Frog Jump6 Months
Maximum Number of Vowels in a Substring of Given Length3 Months
Non-overlapping Intervals3 Months
Find Valid Pair of Adjacent Digits in String
Range Product Queries of Powers
Divide Nodes Into the Maximum Number of Groups
Loud and Rich6 Months
Edit Distance6 Months
Minimum Time to Collect All Apples in a Tree
Minimum Degree of a Connected Trio in a Graph
Minimize the Maximum Difference of Pairs
Path With Minimum Effort
Cut Off Trees for Golf Event
Lexicographically Smallest String After Substring Operation
Decode String3 Months
Intersection of Two Linked Lists30 Days
Count Complete Subarrays in an Array
Department Highest Salary3 Months
Count Vowel Substrings of a String
Sort the Matrix Diagonally
Word Ladder30 Days
Beautiful Arrangement
Find the Minimum Area to Cover All Ones I
Count Univalue Subtrees
Find the Substring With Maximum Cost
Maximum Subarray30 Days
Minimum Equal Sum of Two Arrays After Replacing Zeros
Shifting Letters II
Minimum Number of Keypresses
Shuffle an Array
Distribute Coins in Binary Tree6 Months
Bulls and Cows
Beautiful Towers II
Split a String in Balanced Strings
Minimum Increment to Make Array Unique6 Months
Maximum Ascending Subarray Sum
Contains Duplicate30 Days
Rectangle Overlap
Rearrange Array to Maximize Prefix Score
Fraction Addition and Subtraction
Squares of a Sorted Array3 Months
Cherry Pickup
Minimum Absolute Difference
Replace Words
Check If Array Pairs Are Divisible by k6 Months
Critical Connections in a Network6 Months
Number of Digit One6 Months
Word Pattern II
Maximum Length of Pair Chain6 Months
Parallel Courses
Number of Changing Keys
Sort Colors3 Months
Merge Two Sorted Lists30 Days
Diagonal Traverse II
Flood Fill3 Months
Validate Stack Sequences
Binary Search Tree to Greater Sum Tree
Greatest Common Divisor of Strings6 Months
Pairs of Songs With Total Durations Divisible by 60
Number of Matching Subsequences
Top K Frequent Elements30 Days
Find All Duplicates in an Array
Image Smoother
Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
Decode the Slanted Ciphertext
Minimum Cost to Connect Sticks
Median of Two Sorted Arrays30 Days
Falling Squares
3Sum30 Days
Add to Array-Form of Integer
Regions Cut By Slashes
Largest Rectangle in Histogram3 Months
HTML Entity Parser
Maximum Median Sum of Subsequences of Size 3
Reverse Nodes in k-Group3 Months
Replace Elements with Greatest Element on Right Side
Shortest Path with Alternating Colors
Construct Binary Tree from String
Minimum Adjacent Swaps to Make a Valid Array
Decode Ways3 Months
Binary Tree Right Side View3 Months
Two Sum III - Data structure design
Minimum Number of Chairs in a Waiting Room
Count Days Without Meetings
Minimum Operations to Reduce X to Zero
Erect the Fence
The Maze II
Online Stock Span30 Days
Reverse Words in a String II
Average Selling Price3 Months
Trips and Users
Minimum Sum of Squared Difference3 Months
Minimum Health to Beat Game
Design Front Middle Back Queue
Minimum Path Sum6 Months
Uncrossed Lines
Maximum Number of Occurrences of a Substring6 Months
Minimum Suffix Flips
Group Anagrams30 Days
Find the Duplicate Number3 Months
Find Minimum Time to Reach Last Room II
Minimum Time for K Connected Components
Implement Trie (Prefix Tree)3 Months
Remove Linked List Elements30 Days
Shortest Palindrome3 Months
Lucky Numbers in a Matrix
Find Minimum Time to Finish All Jobs
Design Log Storage System
Encode and Decode TinyURL
Remove Stones to Minimize the Total
Jump Game30 Days
Find Users With Valid E-Mails
Number of Recent Calls3 Months
All Ancestors of a Node in a Directed Acyclic Graph
Decode the Message
Palindrome Partitioning3 Months
Consecutive Numbers6 Months
Delete Nodes And Return Forest
Integer to Roman3 Months
Find Duplicate Subtrees
Construct Binary Tree from Inorder and Postorder Traversal6 Months
Palindrome Number30 Days
Robot Collisions
Minimum Substring Partition of Equal Character Frequency
Same Tree6 Months
Reconstruct Itinerary
Shortest Common Supersequence6 Months
Sum of Two Integers3 Months
Concatenation of Array30 Days
Minimum Operations to Make Binary Array Elements Equal to One I
Merge k Sorted Lists30 Days
Valid Anagram30 Days
Make The String Great
Minimum Operations to Exceed Threshold Value II
Rotate Array30 Days
Random Pick with Blacklist
K Divisible Elements Subarrays
Reverse String3 Months
Maximum XOR for Each Query
Word Break II3 Months
Minimum Score Triangulation of Polygon
The Maze
Maximum Units on a Truck6 Months
Check if a String Is an Acronym of Words
Divide Array Into Arrays With Max Difference
Valid Palindrome30 Days
Best Time to Buy and Sell Stock II3 Months
Majority Element30 Days
Number of Students Unable to Eat Lunch6 Months
Design Underground System
Remove Invalid Parentheses
Longest Substring with At Most Two Distinct Characters
Convert Binary Search Tree to Sorted Doubly Linked List
Check for Contradictions in Equations
Advantage Shuffle
Sell Diminishing-Valued Colored Balls30 Days
Immediate Food Delivery II3 Months
Contiguous Array3 Months
Fibonacci Number3 Months
Odd Even Jump
Island Perimeter6 Months
Remove All Adjacent Duplicates in String II30 Days
Longest Substring with At Most K Distinct Characters
Rectangle Area
Maximize Score of Numbers in Ranges
Add Two Numbers30 Days
Sentence Similarity II
Minimum Remove to Make Valid Parentheses
Minimum Cuts to Divide a Circle
Partition Equal Subset Sum3 Months
Dungeon Game3 Months
Last Substring in Lexicographical Order
Max Consecutive Ones III30 Days
Minimum Time to Complete Trips6 Months
Longest Cycle in a Graph
Finding MK Average
Make Sum Divisible by P
Construct K Palindrome Strings
Subarrays with K Different Integers30 Days
Word Search30 Days
Simplify Path3 Months
Count Unreachable Pairs of Nodes in an Undirected Graph6 Months
Race Car
Maximum Profit From Trading Stocks
Delete Duplicate Folders in System
Subsets II6 Months
Maximum Repeating Substring
Leaf-Similar Trees
Find the City With the Smallest Number of Neighbors at a Threshold Distance
Maximum Subarray Min-Product
Recyclable and Low Fat Products3 Months
Course Schedule IV
Design Hit Counter6 Months
Evaluate Division6 Months
Letter Combinations of a Phone Number30 Days
Permutations II3 Months
Monotonic Array3 Months
Reorder List30 Days
Sum of Nodes with Even-Valued Grandparent
Sum of Subarray Minimums30 Days
Create Binary Tree From Descriptions
Design Add and Search Words Data Structure3 Months
Find Duplicate File in System
Minimum Cost Path with Teleportations3 Months
Find the Town Judge
Find the K-Sum of an Array6 Months
Sum of Square Numbers6 Months
Moving Average from Data Stream
Implement Stack using Queues3 Months
Symmetric Tree6 Months
Final Prices With a Special Discount in a Shop3 Months
Minimum Number of Work Sessions to Finish the Tasks
Longest Balanced Subarray I3 Months
Employee Importance
Combine Two Tables30 Days
Maximum Score From Removing Substrings
Super Egg Drop
Triangle3 Months
Remove Zero Sum Consecutive Nodes from Linked List
Delete Node in a BST6 Months
Subarray Sum Equals K30 Days
Network Delay Time6 Months
3Sum Closest30 Days
N-Queens3 Months
All Paths From Source to Target
Binary Tree Maximum Path Sum3 Months
Sum of All Odd Length Subarrays
Largest Local Values in a Matrix
Diagonal Traverse6 Months
Lowest Common Ancestor of a Binary Tree30 Days
Multiply Strings3 Months
Best Time to Buy and Sell Stock30 Days
Maximal Rectangle3 Months
Gas Station30 Days
How Many Numbers Are Smaller Than the Current Number3 Months
Longest Mountain in Array
Longest Palindromic Subsequence6 Months
Keys and Rooms6 Months
Valid Word Abbreviation
Find N Unique Integers Sum up to Zero6 Months
Soup Servings
Sort an Array6 Months
Delete Duplicate Emails6 Months
Find Lucky Integer in an Array
Find Bottom Left Tree Value
Most Expensive Item That Can Not Be Bought
Best Time to Buy and Sell Stock III
Minimum Moves to Spread Stones Over Grid
Count Number of Nice Subarrays6 Months
Optimal Partition of String
Largest Triangle Area6 Months
Remove Duplicates from Sorted Array3 Months
Random Pick Index
Number of Subarrays That Match a Pattern I
Coin Change II3 Months
Concatenated Words
Design Browser History3 Months
Cousins in Binary Tree
Best Time to Buy and Sell Stock IV
Department Top Three Salaries3 Months
Text Justification6 Months
House Robber II6 Months
Number of Submatrices That Sum to Target
Minimum Obstacle Removal to Reach Corner
Convert Sorted Array to Binary Search Tree6 Months
Delete Node in a Linked List3 Months
Reorder Routes to Make All Paths Lead to the City Zero
Count Good Nodes in Binary Tree
Fizz Buzz6 Months
Balanced Binary Tree30 Days
Defanging an IP Address
N-th Tribonacci Number6 Months
Minimum Fuel Cost to Report to the Capital6 Months
Maximum Product of Splitted Binary Tree3 Months
Find Score of an Array After Marking All Elements
Find the Highest Altitude
Candy30 Days
Sum Root to Leaf Numbers
Champagne Tower30 Days
Flatten Binary Tree to Linked List6 Months
Length of Last Word30 Days
Number of Distinct Islands
Design Linked List6 Months
Smallest Subtree with all the Deepest Nodes6 Months
Lowest Common Ancestor of Deepest Leaves
Minimum Time Difference
Maximum Number of Groups With Increasing Length
Find Triangular Sum of an Array6 Months
Insert into a Binary Search Tree
Lowest Common Ancestor of a Binary Search Tree6 Months
Reverse Vowels of a String6 Months
Assign Cookies30 Days
Delete the Middle Node of a Linked List
Next Greater Node In Linked List3 Months
Article Views I3 Months
Ugly Number3 Months
Reverse Substrings Between Each Pair of Parentheses
Scramble String6 Months
Remove Digit From Number to Maximize Result
132 Pattern30 Days
Binary Tree Longest Consecutive Sequence
Summary Ranges3 Months
Minimum Interval to Include Each Query
Number of Closed Islands
Time Taken to Cross the Door
Find Center of Star Graph
Add Strings6 Months
Excel Sheet Column Title3 Months
Divide Players Into Teams of Equal Skill
Dot Product of Two Sparse Vectors
Reverse Integer30 Days
Max Consecutive Ones30 Days
K-diff Pairs in an Array
Combination Sum II6 Months
Tree Diameter
Palindrome Linked List3 Months
Check If Two String Arrays are Equivalent
Maximum Population Year3 Months
Remove Element3 Months
Sliding Puzzle
Ugly Number II
Maximum Number of Events That Can Be Attended6 Months
Next Greater Element II3 Months
Nearest Exit from Entrance in Maze
Apply Discount to Prices
Path Sum II6 Months
Plus One30 Days
Largest Positive Integer That Exists With Its Negative
Count Pairs Whose Sum is Less than Target6 Months
Count Good Numbers6 Months
Minimum Falling Path Sum3 Months
Kth Largest Element in an Array30 Days
01 Matrix
Count Servers that Communicate
Longest Nice Substring
Expression Add Operators
Odd Even Linked List3 Months
Reverse Linked List II6 Months
Single Number II3 Months
Max Area of Island3 Months
Interleaving String6 Months
Minimum Number of Arrows to Burst Balloons
Missing Number30 Days
Minimum Time to Make Rope Colorful
Is Subsequence3 Months
Minimum Number of Removals to Make Mountain Array
Number of Provinces3 Months
Maximum Length of Repeated Subarray
Unique Paths III
Best Time to Buy and Sell Stock with Transaction Fee
All Possible Full Binary Trees
N-Repeated Element in Size 2N Array3 Months
Count Odd Numbers in an Interval Range
Product Sales Analysis I
Implement Queue using Stacks6 Months
Find Customer Referee
Replace Non-Coprime Numbers in Array
Coin Change3 Months
Matrix Diagonal Sum
Patching Array
Find Occurrences of an Element in an Array
Sort Array by Increasing Frequency
Substrings of Size Three with Distinct Characters
Continuous Subarray Sum
Fair Distribution of Cookies
Shuffle the Array3 Months
Most Profitable Path in a Tree
Deepest Leaves Sum
Sum of Unique Elements
Search Insert Position30 Days
Number of Flowers in Full Bloom
Car Fleet3 Months
Number of Substrings Containing All Three Characters
Find Leaves of Binary Tree
Find First and Last Position of Element in Sorted Array30 Days
Lexicographically Smallest Beautiful String
Minimum Operations to Reduce an Integer to 0
Path Crossing
Word Pattern
Binary Tree Zigzag Level Order Traversal6 Months
Best Time to Buy and Sell Stock using Strategy3 Months
Sentence Similarity III
Length of Longest Subarray With at Most K Frequency
Strong Password Checker
Rising Temperature3 Months
Number of Good Pairs
Minimum Number of Primes to Sum to Target
Is Graph Bipartite?6 Months
The k-th Lexicographical String of All Happy Strings of Length n
Flip String to Monotone Increasing
Minimum Difference Between Largest and Smallest Value in Three Moves
Best Time to Buy and Sell Stock with Cooldown6 Months
Minimum Cost to Make at Least One Valid Path in a Grid
Find the Longest Substring Containing Vowels in Even Counts
Convert a Number to Hexadecimal
Sum of Beauty of All Substrings6 Months
Find Missing Observations
Fruit Into Baskets30 Days
Valid Arrangement of Pairs
Search in Rotated Sorted Array II6 Months
Add Two Numbers II3 Months
Intersection of Two Arrays6 Months
Reverse Pairs3 Months
Longest Increasing Subsequence30 Days
Maximum K to Sort a Permutation
Fraction to Recurring Decimal6 Months
Relative Sort Array
Maximum Product of Three Numbers
Make String a Subsequence Using Cyclic Increments
Find Peak Element3 Months
Remove Nth Node From End of List30 Days
Perfect Squares3 Months
Distinct Subsequences6 Months
Delete and Earn6 Months
Word Subsets
Number of Ways to Split Array
Count Nodes Equal to Average of Subtree
Arranging Coins3 Months
Jewels and Stones6 Months
Subsets30 Days
Add Digits30 Days
Cheapest Flights Within K Stops3 Months
Missing Element in Sorted Array
Count the Number of Good Subarrays
Validate Binary Search Tree30 Days
Step-By-Step Directions From a Binary Tree Node to Another
Minimum Cost to Equalize Array
Meeting Rooms III3 Months
Sudoku Solver3 Months
Function Composition
Find the Number of Possible Ways for an Event
Find Minimum in Rotated Sorted Array3 Months
Integer to English Words6 Months
Unique Paths30 Days
Brightest Position on Street
Minimum Number of Pushes to Type Word I
Lexicographically Smallest Negated Permutation that Sums to Target3 Months
Maximum Number of Removable Characters
Restore the Array From Adjacent Pairs
Remove All Adjacent Duplicates In String3 Months
Happy Number3 Months
Reverse Words in a String III3 Months
Duplicate Emails6 Months
Contains Duplicate II3 Months
Next Greater Element III6 Months
Rotate String3 Months
Divide Two Integers3 Months
Process String with Special Operations I
Minimum Number of Swaps to Make the String Balanced
Relative Ranks
Remove Duplicate Letters
Water Bottles
Stickers to Spell Word
Split Array With Same Average
Truncate Sentence
Widest Vertical Area Between Two Points Containing No Points
Target Sum3 Months
Longest Continuous Increasing Subsequence
Degree of an Array6 Months
Sliding Window Maximum3 Months
Find K Pairs with Smallest Sums3 Months
Minimum Amount of Time to Collect Garbage
Next Greater Element I30 Days
Path with Maximum Gold
Minimum Number of Moves to Make Palindrome
Maximum Beauty of an Array After Applying Operation
Vertical Order Traversal of a Binary Tree30 Days
Minimum Insertion Steps to Make a String Palindrome
Design Memory Allocator6 Months
Find Missing and Repeated Values30 Days
Intersection of Two Arrays II
Merge Strings Alternately3 Months
Minimum Size Subarray Sum3 Months
Rotated Digits
Sequence Reconstruction
Non-decreasing Array
Kill Process
Number of Substrings With Only 1s
Word Break30 Days
Find Longest Self-Contained Substring
Maximum Points You Can Obtain from Cards3 Months
Find the Winner of the Circular Game
Time Needed to Buy Tickets
Numbers At Most N Given Digit Set
Number of Islands II
Sort Characters By Frequency30 Days
Longest Consecutive Sequence30 Days
Alternating Digit Sum
Project Employees I
Find Median from Data Stream3 Months
House Robber3 Months
Reorganize String30 Days
Minimum Moves to Equal Array Elements II
Last Stone Weight30 Days
Divide Array Into Equal Pairs
Water and Jug Problem
Longest Path With Different Adjacent Characters
String to Integer (atoi)30 Days
Consecutive Numbers Sum
Remove Duplicates From an Unsorted Linked List
Range Sum of BST
Boundary of Binary Tree
Employee Bonus3 Months
First Unique Character in a String30 Days
Check if Array Is Sorted and Rotated6 Months
Create a DataFrame from List6 Months
Detonate the Maximum Bombs6 Months
Number of Longest Increasing Subsequence6 Months
Sort List3 Months
Allow One Function Call
Combinations
Min Cost to Connect All Points
4Sum30 Days
Power of Two6 Months
Populating Next Right Pointers in Each Node6 Months
Longest Duplicate Substring
Zuma Game
Maximum Number of Books You Can Take
Can Place Flowers
Merge Operations to Turn Array Into a Palindrome
Design File System6 Months
Shortest Unsorted Continuous Subarray
Count Different Palindromic Subsequences
Spiral Matrix II30 Days
Add Two Integers3 Months
Number of Atoms6 Months
Grand Slam Titles
Power of Three6 Months
Sort Features by Popularity
My Calendar III
Plates Between Candles6 Months
Max Sum of Rectangle No Larger Than K3 Months
Count the Number of K-Free Subsets
Maximum Linear Stock Score
Count Number of Pairs With Absolute Difference K
Perfect Number6 Months
Minimum Swaps to Avoid Forbidden Values3 Months
Swapping Nodes in a Linked List6 Months
Minimize the Difference Between Target and Chosen Elements
Valid Mountain Array
Pyramid Transition Matrix3 Months
Maximize the Beauty of the Garden
Minimum Number of Operations to Move All Balls to Each Box
Number of Enclaves
Not Boring Movies
Customers With Strictly Increasing Purchases
Find the Original Typed String I
Minimum Difference in Sums After Removal of Elements
Maximum Number of Events That Can Be Attended II
Put Marbles in Bags
Count Stepping Numbers in Range
Shortest Subarray to be Removed to Make Array Sorted
Minimum Pair Removal to Sort Array I3 Months
Maximum Width of Binary Tree3 Months
Kth Ancestor of a Tree Node
Sign of the Product of an Array3 Months
Lexicographical Numbers
Counting Bits
Binary Tree Vertical Order Traversal
Remove Palindromic Subsequences
Friendly Movies Streamed Last Month
Count the Number of K-Big Indices
Wiggle Sort
Paint House3 Months
Maximum Alternating Subarray Sum
Valid Parenthesis String6 Months
Find the Difference30 Days
Minimum Operations to Make the Array K-Increasing
Shortest Subarray with Sum at Least K6 Months
Insert into a Sorted Circular Linked List
Reverse String Prefix
Big Countries3 Months
Repeated String Match
Pascal's Triangle II
Maximum Average Subarray I6 Months
Remove Vowels from a String
Maximize the Profit as the Salesman
Find the Kth Smallest Sum of a Matrix With Sorted Rows
Minimize Max Distance to Gas Station
Maximum Number of Non-Overlapping Substrings
Number of Good Paths
Maximize Number of Subsequences in a String
Find the K-or of an Array
Count the Number of Substrings With Dominant Ones6 Months
Plus One Linked List
Sales Analysis II
Repeated DNA Sequences
Maximal Range That Each Element Is Maximum in It
Design a Text Editor
Max Pair Sum in an Array
Element Appearing More Than 25% In Sorted Array
Add Two Polynomials Represented as Linked Lists
Max Dot Product of Two Subsequences3 Months
Minimum Garden Perimeter to Collect Enough Apples
Insufficient Nodes in Root to Leaf Paths
The kth Factor of n
Check if Grid can be Cut into Sections
GCD Sort of an Array
Find the Lexicographically Largest String From the Box I
Amount of Time for Binary Tree to Be Infected3 Months
Prime Number of Set Bits in Binary Representation
Strange Printer
Partition List30 Days
Longest Subsequence Repeated k Times
Find the Maximum Achievable Number6 Months
Sum of Subarray Ranges6 Months
Partition Labels3 Months
Number of Calls Between Two Persons
Matchsticks to Square
Kth Missing Positive Number3 Months
Clone N-ary Tree
Kth Smallest Product of Two Sorted Arrays
Longest Winning Streak
Number of Operations to Make Network Connected6 Months
Number of Steps to Reduce a Number in Binary Representation to One
Split Linked List in Parts
Maximum Balanced Subsequence Sum
Maximum Score After Splitting a String
Subtree of Another Tree6 Months
Evaluate Boolean Binary Tree
Find Elements in a Contaminated Binary Tree
Single-Threaded CPU
Sum of Number and Its Reverse
Sum of Prefix Scores of Strings
Possible Bipartition
Primary Department for Each Employee
Maximum Size of a Set After Removals
Construct String from Binary Tree
Maximum Average Subtree
Product Sales Analysis V
Form Array by Concatenating Subarrays of Another Array
NPV Queries
Maximum Subsequence Score
License Key Formatting
Concatenation of Consecutive Binary Numbers
Count Palindromic Subsequences
Build Binary Expression Tree From Infix Expression
Most Stones Removed with Same Row or Column6 Months
Stone Game II
Find the Median of the Uniqueness Array
Percentage of Users Attended a Contest6 Months
Find a Corresponding Node of a Binary Tree in a Clone of That Tree
Smallest Subsequence of Distinct Characters
Minimum Right Shifts to Sort the Array
Different Ways to Add Parentheses6 Months
Strobogrammatic Number II
Maximum Matrix Sum3 Months
All People Report to the Given Manager
Range Sum of Sorted Subarray Sums
Sum of Digits in the Minimum Number
Game Play Analysis IV
Minimize the Maximum of Two Arrays
Remove One Element to Make the Array Strictly Increasing
Binary Subarrays With Sum3 Months
Longest Binary Subsequence Less Than or Equal to K
Threshold Majority Queries
Create Hello World Function30 Days
Repeated Substring Pattern6 Months
Find Smallest Common Element in All Rows
Maximum Unique Subarray Sum After Deletion
Third Maximum Number6 Months
Count Beautiful Substrings II
Construct Binary Tree from Preorder and Inorder Traversal3 Months
Replace Elements in an Array
Maximum Employees to Be Invited to a Meeting
Make Three Strings Equal
Global and Local Inversions
Minimum Number of Taps to Open to Water a Garden
Closest Binary Search Tree Value
Check if the Rectangle Corner Is Reachable
Count Primes30 Days
Find the Minimum and Maximum Number of Nodes Between Critical Points
Meeting Rooms6 Months
Maximum Sum of Almost Unique Subarray
Handshakes That Don't Cross
Rank Scores30 Days
Minimum Depth of Binary Tree
Game Play Analysis I6 Months
Balance a Binary Search Tree30 Days
Freedom Trail
Flipping an Image
Relocate Marbles
Minimum Operations to Make the Array Increasing
Remove Duplicates from Sorted List II
Find Common Elements Between Two Arrays
Richest Customer Wealth6 Months
Sum of Scores of Built Strings
Longest Substring with At Least K Repeating Characters30 Days
Single Number30 Days
Counter
Lexicographically Minimum String After Removing Stars
Smallest Integer Divisible by K
Count Negative Numbers in a Sorted Matrix3 Months
Evaluate Reverse Polish Notation30 Days
Replace Employee ID With The Unique Identifier6 Months
Maximum Frequency of an Element After Performing Operations II
Maximum Bags With Full Capacity of Rocks
Find in Mountain Array6 Months
Prison Cells After N Days
Tiling a Rectangle with the Fewest Squares
Ones and Zeroes
Shuffle String
Longest Balanced Substring II30 Days
Parsing A Boolean Expression
Teemo Attacking
Identify the Largest Outlier in an Array
Find the Missing IDs
Minimum Cost to Reach Destination in Time
Wiggle Sort II
Shift 2D Grid
Queries on a Permutation With Key
Two Sum Less Than K
DI String Match
Spiral Matrix III
Find Pivot Index
Maximal Score After Applying K Operations
Predict the Winner6 Months
Minimum Cost to Cut a Stick
Number of Steps to Reduce a Number to Zero
Path With Maximum Minimum Value
Ad-Free Sessions
Sequentially Ordinal Rank Tracker
Stable Subarrays With Equal Boundary and Interior Sum
Min Cost Climbing Stairs3 Months
Delete Columns to Make Sorted II3 Months
Range Sum Query 2D - Mutable
Range Addition
Serialize and Deserialize N-ary Tree
Minimum Time to Activate String
Unique Number of Occurrences6 Months
Check if Move is Legal
Number of Equivalent Domino Pairs
Can I Win
Find the Index of the Large Integer
Zigzag Iterator
Find All People With Secret
Employee Free Time
Minimum Swaps to Group All 1's Together II
Optimal Division
Design Search Autocomplete System
Count Complete Tree Nodes
Number of Subarrays with Bounded Maximum
Maximum Difference Between Even and Odd Frequency II
House Robber IV
Binary Tree Preorder Traversal
Construct Binary Search Tree from Preorder Traversal6 Months
Destroying Asteroids
Index Pairs of a String
Product Sales Analysis II
All Valid Triplets That Can Represent a Country
Maximum Candies Allocated to K Children6 Months
Linked List Cycle3 Months
Path with Maximum Probability
Longest Palindrome
Sum of Left Leaves
Super Pow
Find the Difference of Two Arrays6 Months
Map of Highest Peak
Product Price at a Given Date6 Months
Lexicographically Smallest Palindrome
Increasing Triplet Subsequence6 Months
To Be Or Not To Be6 Months
Armstrong Number
Binary Search Tree Iterator
Number of Sets of K Non-Overlapping Line Segments
Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values
Equal Tree Partition
Flatten Nested List Iterator
Contains Duplicate III6 Months
Human Traffic of Stadium
Two Sum BSTs
Find the Team Size
Decompress Run-Length Encoded List
Running Sum of 1d Array3 Months
Find Target Indices After Sorting Array6 Months
Accounts Merge3 Months
Counter II
Find the Maximum Length of Valid Subsequence II
Count Hills and Valleys in an Array
Recover Binary Search Tree6 Months
K-th Smallest in Lexicographical Order
Number of Days in a Month
Find K-Length Substrings With No Repeated Characters
Replace Question Marks in String to Minimize Its Value
Sum of Beauty in the Array
Search a 2D Matrix3 Months
Students With Invalid Departments
Sum of Distances in Tree
Best Poker Hand
Task Scheduler II
Maximum of Minimum Values in All Subarrays
Guess Number Higher or Lower6 Months
Difference Between Ones and Zeros in Row and Column
Verify Preorder Serialization of a Binary Tree
Remove Outermost Parentheses3 Months
Count Triplets with Even XOR Set Bits I
Closest Room
Jump Game VII
Path Sum
Find Interview Candidates
Subarray Sums Divisible by K6 Months
Remove Duplicates from Sorted List3 Months
Maximum Element After Decreasing and Rearranging
Count Pairs Of Nodes
Rearrange Characters to Make Target String
Filling Bookcase Shelves
Find the Maximum Number of Elements in Subset
Maximum Score After Binary Swaps
Find Eventual Safe States3 Months
Integer Replacement
Remove Duplicates from Sorted Array II6 Months
Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
Max Number of K-Sum Pairs6 Months
Shortest Path in a Grid with Obstacles Elimination
Customers Who Never Order30 Days
Redundant Connection
Boats to Save People3 Months
Count Number of Special Subsequences
Maximum Score of a Good Subarray
Combination Sum IV
Minesweeper
Delete Columns to Make Sorted III3 Months
Nim Game
Sales by Day of the Week
Max Chunks To Make Sorted II
Subarrays Distinct Element Sum of Squares II
Valid Triangle Number6 Months
Maximum Average Pass Ratio
Cache With Time Limit
Maximum Calories Burnt from Jumps
Find Minimum Time to Finish All Jobs II
Merge In Between Linked Lists6 Months
Count Beautiful Substrings I
Minimum Add to Make Parentheses Valid3 Months
Invert Binary Tree3 Months
Product Sales Analysis IV
Employees Earning More Than Their Managers30 Days
Maximum Frequency Stack6 Months
Magnetic Force Between Two Balls6 Months
Simple Bank System
Find Number of Ways to Reach the K-th Stair
Continuous Subarrays
Confirmation Rate6 Months
Valid Palindrome III
Set Mismatch3 Months
Integer Break
Cherry Pickup II
Factorial Trailing Zeroes3 Months
Find Minimum Operations to Make All Elements Divisible by Three6 Months
Count Numbers With Unique Digits II
Binary Tree Level Order Traversal II
Minimum Operations to Remove Adjacent Ones in Matrix
Count Triplets with Even XOR Set Bits II
Two Best Non-Overlapping Events3 Months
Closest Divisors
Largest Values From Labels
Find if Path Exists in Graph
Count the Number of Fair Pairs
Merge Nodes in Between Zeros
String Compression III
Maximize Points After Choosing K Tasks
Connecting Cities With Minimum Cost
Maximum Consecutive Floors Without Special Floors
Hand of Straights
Maximum Bitwise AND After Increment Operations
Binary Search3 Months
Nth Digit
Number of Unique Categories
Grid Game
Find Subsequence of Length K With the Largest Sum
Range Sum Query - Immutable6 Months
Employees With Deductions
Maximum Product of Word Lengths
Shortest Matching Substring
Strange Printer II
Maximum Gap
Merge Two 2D Arrays by Summing Values
Clumsy Factorial
Linked List Components
Profitable Schemes6 Months
Find the Number of Subarrays Where Boundary Elements Are Maximum
Count the Number of Special Characters II
My Calendar II
Create Maximum Number
Minimum Cost to Merge Stones
Maximum of Absolute Value Expression
Next Palindrome Using Same Digits
Bulb Switcher30 Days
Ant on the Boundary
Keyboard Row
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Russian Doll Envelopes3 Months
2 Keys Keyboard
Minimum Unique Word Abbreviation
Least Number of Unique Integers after K Removals
Find Xor-Beauty of Array
Maximum Nesting Depth of the Parentheses
Custom Sort String
Products With Three or More Orders in Two Consecutive Years
Count of Range Sum
Distinct Numbers in Each Subarray
Largest Sum of Averages
Find Maximum Non-decreasing Array Length
Minimum Money Required Before Transactions
First Bad Version3 Months
Binary Tree Coloring Game
Closest Leaf in a Binary Tree
Maximum Sum Score of Array
Arithmetic Slices6 Months
Pizza With 3n Slices
Score of a String6 Months
Design an Expression Tree With Evaluate Function6 Months
Get the Size of a DataFrame
Minimum Insertions to Balance a Parentheses String
Memoize
Kids With the Greatest Number of Candies
Customer Order Frequency
Prime Arrangements
Sparse Matrix Multiplication
Diet Plan Performance
Find the Celebrity6 Months
Largest Divisible Subset6 Months
Rotate List3 Months
Nested List Weight Sum
Meeting Scheduler
Search in a Binary Search Tree
Minimum Sensors to Cover Grid
Smallest String Starting From Leaf
Decode XORed Permutation
Surrounded Regions30 Days
Maximum Size Subarray Sum Equals k
H-Index30 Days
Longest Common Subpath
Ransom Note6 Months
Warehouse Manager
Frequency of the Most Frequent Element30 Days
Rearranging Fruits
Return Length of Arguments Passed
K Radius Subarray Averages
Peak Index in a Mountain Array3 Months
Partition Array According to Given Pivot
Separate Black and White Balls
Sales Analysis I
Maximum Performance of a Team
Number of Good Ways to Split a String
Buildings With an Ocean View
Maximum Difference Between Even and Odd Frequency I
Lowest Common Ancestor of a Binary Tree III6 Months
Minimum Number of Increments on Subarrays to Form a Target Array6 Months
Minimum Operations to Make Array Equal to Target
Number of Distinct Averages
Design an Array Statistics Tracker
Report Contiguous Dates
Longest Balanced Subarray II30 Days
Users With Two Purchases Within Seven Days
Design Twitter3 Months
Find Words Containing Character
Calculate Money in Leetcode Bank
Digit Count in Range
Largest Unique Number
Reordered Power of 26 Months
Most Profit Assigning Work
Binary Tree Level Order Traversal3 Months
Minimum Array Sum
Minimum Speed to Arrive on Time
Letter Tile Possibilities
Count Items Matching a Rule
Substring Matching Pattern
Binary Tree Inorder Traversal6 Months
Total Sum of Interaction Cost in Tree Groups
Jump Game VIII
Count Ways to Make Array With Product
Minimum Numbers of Function Calls to Make Target Array
Find Cumulative Salary of an Employee
Maximum Number of Points From Grid Queries
Maximum Number of Achievable Transfer Requests
Friend Requests II: Who Has the Most Friends
Minimize Malware Spread
Minimum Stability Factor of Array
Number of Times a Driver Was a Passenger
Swap Nodes in Pairs3 Months
Robot Room Cleaner
Valid Tic-Tac-Toe State
Unique Length-3 Palindromic Subsequences
Convert Integer to the Sum of Two No-Zero Integers6 Months
Count of Smaller Numbers After Self3 Months
Substring With Largest Variance
Complete Binary Tree Inserter
Count Partitions with Even Sum Difference3 Months
Find Number of Coins to Place in Tree Nodes
A Number After a Double Reversal
Find the Minimum Amount of Time to Brew Potions6 Months
Find Closest Person
Find All K-Distant Indices in an Array
Find Mode in Binary Search Tree
Reach a Number
Convert BST to Greater Tree
Maximum Coins From K Consecutive Bags
Find X-Sum of All K-Long Subarrays I6 Months
Replace the Substring for Balanced String
Count Subarrays Where Max Element Appears at Least K Times
Count Unique Characters of All Substrings of a Given String
Minimum Falling Path Sum II
Find Largest Value in Each Tree Row
Sort the People
Paths in Matrix Whose Sum Is Divisible by K6 Months
Binary Tree Postorder Traversal
Crawler Log Folder
Fix Names in a Table3 Months
Smallest Number in Infinite Set
Minimum Amount of Damage Dealt to Bob
Find Most Frequent Vowel and Consonant
Take K of Each Character From Left and Right
The K Weakest Rows in a Matrix
Minimum Operations to Convert All Elements to Zero
Trim a Binary Search Tree
Maximum Difference Between Increasing Elements
Lexicographically Smallest Equivalent String
Count Total Number of Colored Cells
Maximum Ice Cream Bars
Bag of Tokens
Count the Number of Computer Unlocking Permutations
Time Needed to Inform All Employees
Actors and Directors Who Cooperated At Least Three Times
Zero Array Transformation III
Balanced K-Factor Decomposition
Base 73 Months
Longest Square Streak in an Array
Split a String Into the Max Number of Unique Substrings
Count Number of Rectangles Containing Each Point6 Months
Longest Subarray With Maximum Bitwise AND
Find the K-th Character in String Game I
Increasing Decreasing String
Apply Transform Over Each Element in Array
Maximum 69 Number6 Months
Root Equals Sum of Children
Triangle Judgement
Maximum Frequency of an Element After Performing Operations I6 Months
Longest Happy Prefix
Reverse String II
Maximum Subarray Sum With Length Divisible by K3 Months
Longest Balanced Substring I30 Days
Reschedule Meetings for Maximum Free Time I
Append K Integers With Minimal Sum
Check If N and Its Double Exist
Jump Game IV
Finding 3-Digit Even Numbers
Count Submatrices With All Ones
Group Sold Products By The Date
Find Longest Special Substring That Occurs Thrice I
Kth Smallest Instructions
Find the Maximum Length of Valid Subsequence I3 Months
Smallest Subarrays With Maximum Bitwise OR
Maximize Happiness of Selected Children3 Months
Sum of Absolute Differences in a Sorted Array6 Months
Out of Boundary Paths
Sort Items by Groups Respecting Dependencies
Maximum Number of Distinct Elements After Operations6 Months
Insert Greatest Common Divisors in Linked List
Minimum Hours of Training to Win a Competition
Delete Nodes From Linked List Present in Array6 Months
Count Number of Teams
Count Largest Group6 Months
Trionic Array II
Find Kth Bit in Nth Binary String
Unique Binary Search Trees II6 Months
Minimum Number of Operations to Make Elements in Array Distinct
Average of Levels in Binary Tree
Minimum Number Game
Minimum Operations to Make a Subsequence
Queries Quality and Percentage
Move Pieces to Obtain a String
Maximum Running Time of N Computers3 Months
K-th Symbol in Grammar
Minimum Removals to Balance Array30 Days
Domino and Tromino Tiling6 Months
Adding Spaces to a String
Maximum Absolute Sum of Any Subarray
4Sum II
The Earliest and Latest Rounds Where Players Compete
Minimum Limit of Balls in a Bag
Find Total Time Spent by Each Employee
Maximum Score Words Formed by Letters
Mirror Reflection
Self Dividing Numbers
Minimum Operations to Make the Integer Zero6 Months
Separate Squares I3 Months
Largest Perimeter Triangle
Design Circular Deque
Maximum Sum of 3 Non-Overlapping Subarrays
New 21 Game
Check Knight Tour Configuration
Distinct Subsequences II
Solving Questions With Brainpower
Car Fleet II
Tuple with Same Product
Water Bottles II6 Months
Product Sales Analysis III6 Months
Happy Students3 Months
Minimum Score After Removals on a Tree
Sum of Total Strength of Wizards
Check If Digits Are Equal in String After Operations I
Shortest Distance After Road Addition Queries I
Numbers With Same Consecutive Differences
Delete Leaves With a Given Value
Painting a Grid With Three Different Colors
Count Partitions With Max-Min Difference at Most K6 Months
Check if Two Chessboard Squares Have the Same Color
Lexicographically Smallest Permutation Greater Than Target6 Months
Divisible and Non-divisible Sums Difference
Number of Laser Beams in a Bank
Minimum Positive Sum Subarray
Maximum Erasure Value6 Months
Determine Whether Matrix Can Be Obtained By Rotation
List the Products Ordered in a Period
Stream of Characters
Find Minimum in Rotated Sorted Array II
Find the Original Typed String II
Longest ZigZag Path in a Binary Tree
Smallest Range II6 Months
Apply Operations to Make All Array Elements Equal to Zero
Minimum Cost to Convert String I30 Days
Cat and Mouse
Reorder Data in Log Files
Maximum Value after Insertion
Binary Tree Pruning
Minimum Number of Groups to Create a Valid Assignment30 Days
Three Consecutive Odds
Design a Food Rating System
Set Intersection Size At Least Two6 Months
Minimum Seconds to Equalize a Circular Array
Greatest Sum Divisible by Three3 Months
Count Number of Texts
Number of Employees Who Met the Target
Count the Number of Complete Components
Surface Area of 3D Shapes
Total Characters in String After Transformations I
Nth Magical Number30 Days
Minimum Addition to Make Integer Beautiful
Count Subarrays of Length Three With a Condition
Construct the Lexicographically Largest Valid Sequence
Extra Characters in a String
Clear Digits
Select K Disjoint Special Substrings
Count the Number of Ideal Arrays
Convert 1D Array Into 2D Array
Smallest Missing Non-negative Integer After Operations6 Months
Array Partition3 Months
Circular Array Loop
String Matching in an Array
Longest Repeating Substring
Remove Covered Intervals
Convert the Temperature6 Months
Best Time to Buy and Sell Stock V6 Months
Sales Analysis III
Find the K-th Character in String Game II
Sales Person
Maximum and Minimum Sums of at Most Size K Subsequences
Most Frequent IDs
Reformat Department Table
Minimum Swaps To Make Sequences Increasing
Number of Pairs Satisfying Inequality
Minimum Number of Vertices to Reach All Nodes
Solve the Equation
Find the Number of Ways to Place People I6 Months
Find the Pivot Integer
Partition Array Such That Maximum Difference Is K
Minimum Cost Walk in Weighted Graph
Maximum Sum of Three Numbers Divisible by Three6 Months
Number of Distinct Islands II
Longest Common Prefix Between Adjacent Strings After Removals
Minimum Cost to Convert String II
Number of Ways to Paint N × 3 Grid3 Months
Number of Wonderful Substrings
Reducing Dishes
Append Characters to String to Make Subsequence
Distant Barcodes
Sum of Digits in Base K
Construct Smallest Number From DI String
Maximum Total Importance of Roads
Final Array State After K Multiplication Operations I
Maximum Number of Fish in a Grid
Number of Smooth Descent Periods of a Stock
Maximum Level Sum of a Binary Tree3 Months
Perfect Rectangle3 Months
Super Washing Machines
Check Balanced String
Array Nesting
Number of Subsequences That Satisfy the Given Sum Condition6 Months
Range Module
Last Stone Weight II6 Months
Removing Stars From a String
Analyze Organization Hierarchy
Minimum Operations to Make Array Sum Divisible by K6 Months
Minimum Index of a Valid Split
Maximum Difference by Remapping a Digit
Distribute Candies to People
Find Special Substring of Length K
Largest Multiple of Three
Parse Lisp Expression
Longest Turbulent Subarray
Count Symmetric Integers
Maximum Frequency After Subarray Operation30 Days
Kth Distinct String in an Array
Valid Palindrome IV
Dinner Plate Stacks
Check if Number is a Sum of Powers of Three
Count Collisions on a Road
Binary Prefix Divisible By 56 Months
Minimum Number of Operations to Make Array Empty
Check if One String Swap Can Make Strings Equal
Total Appeal of A String
Minimum Operations to Equalize Binary String6 Months
Consecutive Transactions with Increasing Amounts
Number of Pairs of Interchangeable Rectangles
Transformed Array30 Days
Strictly Palindromic Number3 Months
Customer Purchasing Behavior Analysis
Recover a Tree From Preorder Traversal
Ways to Express an Integer as Sum of Powers
Friends Of Appropriate Ages6 Months
Maximum Number of K-Divisible Components
Rearrange Products Table
First and Last Call On the Same Day
Maximum Star Sum of a Graph
Super Ugly Number
Implement Trie II (Prefix Tree)
Complex Number Multiplication
Vowels Game in a String
Trionic Array I30 Days
Detect Squares6 Months
Neighboring Bitwise XOR
Minimum Cost to Make Arrays Identical
Count Collisions of Monkeys on a Polygon
Count the Number of Special Characters I
Adjacent Increasing Subarrays Detection I
The Two Sneaky Numbers of Digitville
Frog Jump II
Minimize the Maximum Adjacent Element Difference
Valid Phone Numbers
Take Gifts From the Richest Pile
Two-Letter Card Game
Maximum Sum With at Most K Elements
Maximum Odd Binary Number
Employees Whose Manager Left the Company
Separate Squares II3 Months
Maximum Balanced Shipments6 Months
Minimum Time to Repair Cars
Longest Absolute File Path
Number of Common Factors
Filter Elements from Array
Modify Columns
Second Minimum Node In a Binary Tree
Maximum Number of Coins You Can Get
Uncommon Words from Two Sentences
Maximum Total from Optimal Activation Order
Find The K-th Lucky Number
Maximize Cyclic Partition Score6 Months
Removing Minimum and Maximum From Array
Longest Ideal Subsequence
Minimum Cost to Hire K Workers
Gray Code6 Months
Shortest Path Visiting All Nodes
Construct Product Matrix
Buy Two Chocolates
Minimum Domino Rotations For Equal Row
Check if Matrix Is X-Matrix
Find Smallest Letter Greater Than Target
Maximum Matching of Players With Trainers
Special Array With X Elements Greater Than or Equal X
Minimum Time to Visit a Cell In a Grid
Maximum Difference Between Node and Ancestor
Minimum Time Visiting All Points
All Elements in Two Binary Search Trees
XOR Queries of a Subarray
Maximum Value of an Ordered Triplet I
Lowest Common Ancestor of a Binary Tree IV
Sort Array By Parity II6 Months
Find the Power of K-Size Subarrays I
Patients With a Condition
Minimum Pair Removal to Sort Array II3 Months
Length of the Longest Subsequence That Sums to Target
Promise Time Limit
Maximum Capacity Within Budget6 Months
Maximum Value of an Ordered Triplet II
Row With Maximum Ones
Delete Greatest Value in Each Row
Make Array Zero by Subtracting Equal Amounts
Maximize the Minimum Powered City6 Months
Prime Subtraction Operation
Minimum Number of Operations to Make All Array Elements Equal to 16 Months
Maximum Possible Number by Binary Concatenation
Find Nearest Point That Has the Same X or Y Coordinate
N-ary Tree Preorder Traversal
Allocate Mailboxes
Maximum Twin Sum of a Linked List6 Months
Find Building Where Alice and Bob Can Meet
Count Bowl Subarrays6 Months
Zero Array Transformation II
Find the Number of Good Pairs I
Data Stream as Disjoint Intervals
Number of Zero-Filled Subarrays
Find the Middle Index in Array
Minimum Time to Complete All Deliveries3 Months
Biggest Single Number
Minimum Number of Moves to Seat Everyone
Count Number of Maximum Bitwise-OR Subsets
Reveal Cards In Increasing Order6 Months
Find the Number of Distinct Colors Among the Balls
Flatten a Multilevel Doubly Linked List3 Months
Sort the Jumbled Numbers
Sleep6 Months
Find Right Interval
Count of Matches in Tournament
Number of Unique Subjects Taught by Each Teacher6 Months
Maximum Number of Words Found in Sentences3 Months
Rearrange Array Elements by Sign30 Days
Encrypt and Decrypt Strings
Kth Largest Sum in a Binary Tree
Maximum Number of Points with Cost
Knight Dialer
Equal Row and Column Pairs
Flip Columns For Maximum Number of Equal Rows
Sum of All Subset XOR Totals3 Months
Reschedule Meetings for Maximum Free Time II
Smallest Even Multiple6 Months
Magic Squares In Grid3 Months
Shortest Distance to a Character
Maximum Difference Between Adjacent Elements in a Circular Array
Design Task Manager6 Months
Delete Operation for Two Strings
Smallest Palindromic Rearrangement I
N-ary Tree Level Order Traversal
Generate Binary Strings Without Adjacent Zeros
Array Reduce Transformation
Minimum Number of People to Teach6 Months
Construct the Rectangle
Bitwise AND of Numbers Range
Minimum Absolute Difference in BST3 Months
Construct Binary Tree from Preorder and Postorder Traversal
The Latest Time to Catch a Bus
Build Array from Permutation
Minimize Manhattan Distances
Minimum Recolors to Get K Consecutive Black Blocks
Make Array Elements Equal to Zero6 Months
Partition Array for Maximum Sum3 Months
Hamming Distance
Elimination Game30 Days
Longest Subsequence With Limited Sum6 Months
Maximum Number of Operations to Move Ones to the End6 Months
Length of Longest Fibonacci Subsequence
Construct the Minimum Bitwise Array I3 Months
Zero Array Transformation I
Largest Element in an Array after Merge Operations
Minimum Division Operations to Make Array Non Decreasing
Smallest Good Base
Pizza Toppings Cost Analysis
Split With Minimum Sum
Four Divisors
Final Value of Variable After Performing Operations6 Months
Duplicate Zeros
Maximize Subarrays After Removing One Conflicting Pair
Count Beautiful Splits in an Array
Sort By
Minimize XOR
Find Good Days to Rob the Bank
Fruits Into Baskets III
Minimum Number of Days to Disconnect Island
Check if All Characters Have Equal Number of Occurrences
Minimum Average of Smallest and Largest Elements
Find K-th Smallest Pair Distance
Split Array into Fibonacci Sequence
Array Prototype Last
X of a Kind in a Deck of Cards
Rank Transform of an Array
Unique 3-Digit Even Numbers3 Months
Prime Palindrome
Maximum XOR of Two Numbers in an Array
Apply Operations to an Array
Defuse the Bomb
Minimum Sum of Four Digit Number After Splitting Digits6 Months
Minimum Array End
N-ary Tree Postorder Traversal
Smallest Number With All Set Bits
Minimum Length of String After Deleting Similar Ends
Mini Parser
Ugly Number III6 Months
Rotate Function
Count of Substrings Containing Every Vowel and K Consonants II
Remove Nodes From Linked List
Most Common Word
Sorting the Sentence
Double a Number Represented as a Linked List
Maximum Sum of Two Non-Overlapping Subarrays
Minimize Maximum Pair Sum in Array
Implement Router6 Months
Delete Columns to Make Sorted
Minimum Number of Operations to Make Array XOR Equal to K
Customers Who Bought All Products6 Months
Last Day Where You Can Still Cross6 Months
Display the First Three Rows
Insertion Sort List6 Months
Sliding Subarray Beauty
Reshape the Matrix
Sort Array By Parity6 Months
Number of Dice Rolls With Target Sum
Check Completeness of a Binary Tree
Length of the Longest Valid Substring
Even Odd Tree6 Months
Sum of Root To Leaf Binary Numbers
Reshape Data: Concatenate
Largest Odd Number in String
Year on Year Growth Rate
Most Frequent Subtree Sum
Push Dominoes
Find the Number of Good Pairs II
Nested List Weight Sum II
Robot Return to Origin
Maximum Sum With Exactly K Elements
Similar String Groups6 Months
Clone Binary Tree With Random Pointer
Largest Combination With Bitwise AND Greater Than Zero
Construct the Minimum Bitwise Array II3 Months
Binary Tree Tilt
Count Number of Bad Pairs
Orderly Queue6 Months
Increasing Order Search Tree
Minimum Number of Pushes to Type Word II
Cousins in Binary Tree II
Binary Watch
Flip Equivalent Binary Trees
Number of Segments in a String
Count Covered Buildings6 Months
The Most Recent Orders for Each Product
Find if Array Can Be Sorted
Check if the Sentence Is Pangram
Minimum Average Difference
Maximum Number of Moves in a Grid
Minimum Jumps to Reach Home
Divide an Array Into Subarrays With Minimum Cost I30 Days
Swap Sex of Employees
Find the Punishment Number of an Integer
Traffic Light Controlled Intersection
Number of Ways to Arrive at Destination
Magical String
Find the Largest Palindrome Divisible by K
Beautiful Array
Circular Sentence
Reshape Data: Pivot
Make Two Arrays Equal by Reversing Subarrays
Minimum Operations to Make the Array Alternating
Number of Even and Odd Bits
The Most Frequently Ordered Products for Each Customer
Count Substrings That Can Be Rearranged to Contain a String I
Determine if String Halves Are Alike
Combination Sum III6 Months
Number of Sub-arrays With Odd Sum
Reshape Data: Melt
Arithmetic Slices II - Subsequence
Consecutive Characters
Corporate Flight Bookings
Find the Divisibility Array of a String
Minimum Moves to Equal Array Elements
Can Make Arithmetic Progression From Sequence