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Meta Master DSA Sheet

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

top-specificmeta-prep
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1387
Minimum Genetic Mutation
Medium
Maximum Count of Positive Integer and Negative Integer
Easy
Asteroid Collision3 Months
Medium
Minimum Bit Flips to Convert Number
Easy
Find the Integer Added to Array II
Medium
Customer Who Visited but Did Not Make Any Transactions6 Months
Easy
Jump Game II6 Months
Medium
Rotating the Box
Medium
Majority Element II
Medium
Find the Closest Palindrome
Hard
Maximize Area of Square Hole in Grid6 Months
Medium
Walking Robot Simulation
Medium
Maximum Alternating Subsequence Sum
Medium
Longest Univalue Path
Medium
Valid Parentheses30 Days
Easy
Min Stack3 Months
Medium
Find Followers Count
Easy
Fruits Into Baskets II6 Months
Easy
Longest Subarray of 1's After Deleting One Element
Medium
Invalid Tweets
Easy
Vowel Spellchecker
Medium
Find Resultant Array After Removing Anagrams
Easy
Bitwise XOR of All Pairings
Medium
User Activity for the Past 30 Days II
Easy
Special Array I
Easy
Find Closest Number to Zero
Easy
K Inverse Pairs Array
Hard
Smallest Range Covering Elements from K Lists
Hard
Second Highest Salary6 Months
Medium
Grumpy Bookstore Owner6 Months
Medium
Monthly Transactions I
Medium
Convert Sorted List to Binary Search Tree
Medium
Delete Characters to Make Fancy String
Easy
Tree Node3 Months
Medium
Inorder Successor in BST
Medium
Avoid Flood in The City
Medium
Shortest Cycle in a Graph
Hard
Minimum ASCII Delete Sum for Two Strings3 Months
Medium
Kth Smallest Element in a Sorted Matrix30 Days
Medium
Open the Lock6 Months
Medium
Snapshot Array
Medium
Validate IP Address6 Months
Medium
Find the Length of the Longest Common Prefix
Medium
Design HashMap3 Months
Easy
Permutation Sequence
Hard
Meeting Rooms II30 Days
Medium
Shortest Subarray With OR at Least K II
Medium
Number of Connected Components in an Undirected Graph
Medium
Destination City
Easy
Longest Nice Subarray
Medium
Best Meeting Point
Hard
Max Stack
Hard
User Activity for the Past 30 Days I6 Months
Easy
Count Unguarded Cells in the Grid6 Months
Medium
Minimum Moves to Reach Target Score
Medium
Using a Robot to Print the Lexicographically Smallest String
Medium
Special Array II
Medium
Furthest Building You Can Reach
Medium
Best Sightseeing Pair
Medium
Print Binary Tree
Medium
Reverse Linked List3 Months
Easy
Design Tic-Tac-Toe6 Months
Medium
Max Difference You Can Get From Changing an Integer
Medium
Sort Matrix by Diagonals
Medium
Find a Peak Element II
Medium
Course Schedule II30 Days
Medium
Minimum Height Trees
Medium
Dota2 Senate
Medium
Subarray Product Less Than K3 Months
Medium
Word Ladder II6 Months
Hard
N-Queens II
Hard
Knight Probability in Chessboard
Medium
Insert Delete GetRandom O(1) - Duplicates allowed
Hard
Minimum Penalty for a Shop
Medium
Unique Binary Search Trees3 Months
Medium
Zigzag Conversion3 Months
Medium
Shortest Distance from All Buildings6 Months
Hard
Minimum Deletions to Make String Balanced30 Days
Medium
Brick Wall
Medium
Investments in 2016
Medium
Count the Number of Infection Sequences6 Months
Hard
Count Equal and Divisible Pairs in an Array
Easy
Pacific Atlantic Water Flow6 Months
Medium
Letter Case Permutation6 Months
Medium
Find Common Characters
Easy
Top K Frequent Words6 Months
Medium
Alternating Groups I
Easy
Linked List in Binary Tree
Medium
Spiral Matrix3 Months
Medium
Graph Valid Tree
Medium
Count the Number of Arrays with K Matching Adjacent Elements
Hard
Design Skiplist
Hard
Nth Highest Salary
Medium
Partition Array Into Two Arrays to Minimize Sum Difference
Hard
Longest Harmonious Subsequence
Easy
Power of Four
Easy
Find K Closest Elements6 Months
Medium
Movie Rating3 Months
Medium
Remove Sub-Folders from the Filesystem
Medium
Alien Dictionary3 Months
Hard
Count Subarrays With Score Less Than K
Hard
All Nodes Distance K in Binary Tree30 Days
Medium
Copy List with Random Pointer3 Months
Medium
Count the Number of Powerful Integers
Hard
Merge Intervals30 Days
Medium
Minimum Distance Between BST Nodes
Easy
Group Shifted Strings3 Months
Medium
Clone Graph3 Months
Medium
Maximum Height by Stacking Cuboids6 Months
Hard
Time Based Key-Value Store6 Months
Medium
Find Original Array From Doubled Array
Medium
Minimum Cost For Tickets6 Months
Medium
Baseball Game
Easy
Longest Palindromic Substring30 Days
Medium
Substring with Concatenation of All Words6 Months
Hard
Generate Parentheses30 Days
Medium
Two City Scheduling
Medium
Search Suggestions System
Medium
Find Numbers with Even Number of Digits6 Months
Easy
Minimum Number of Days to Make m Bouquets
Medium
Next Permutation3 Months
Medium
Split Array Largest Sum6 Months
Hard
Serialize and Deserialize Binary Tree6 Months
Hard
Longest String Chain
Medium
Pow(x, n)3 Months
Medium
K Closest Points to Origin30 Days
Medium
Peeking Iterator
Medium
Battleships in a Board30 Days
Medium
Longest Substring Without Repeating Characters3 Months
Medium
Painting the Walls
Hard
Maximum Product of Two Elements in an Array
Easy
Diameter of Binary Tree30 Days
Easy
Count the Hidden Sequences
Medium
Product of Array Except Self30 Days
Medium
Minimum Cost of Buying Candies With Discount
Easy
Koko Eating Bananas3 Months
Medium
Subtract the Product and Sum of Digits of an Integer
Easy
Maximum Product Subarray3 Months
Medium
Block Placement Queries
Hard
Next Greater Numerically Balanced Number6 Months
Medium
Design HashSet
Easy
Encode and Decode Strings
Medium
Finding Pairs With a Certain Sum6 Months
Medium
Number of Days Between Two Dates
Easy
Maximum Sum Circular Subarray
Medium
Capital Gain/Loss
Medium
Divide Intervals Into Minimum Number of Groups
Medium
3Sum With Multiplicity
Medium
Climbing Stairs3 Months
Easy
Transpose Matrix6 Months
Easy
The Number of Employees Which Report to Each Employee
Easy
Verifying an Alien Dictionary
Easy
Distribute Candies Among Children II
Medium
Managers with at Least 5 Direct Reports
Medium
Two Sum IV - Input is a BST
Easy
Car Pooling6 Months
Medium
Binary Tree Paths6 Months
Easy
Kth Smallest Element in a BST6 Months
Medium
Trapping Rain Water30 Days
Hard
Event Emitter
Medium
Path Sum III
Medium
Palindrome Pairs
Hard
Maximum Depth of Binary Tree6 Months
Easy
Minimum Knight Moves6 Months
Medium
Minimum Window Substring30 Days
Hard
Minimum Difference Between Highest and Lowest of K Scores
Easy
Swim in Rising Water30 Days
Hard
Max Chunks To Make Sorted
Medium
Task Scheduler
Medium
Analyze User Website Visit Pattern
Medium
Shortest Way to Form String
Medium
Decoded String at Index
Medium
Basic Calculator II3 Months
Medium
Average Time of Process per Machine6 Months
Easy
Basic Calculator III
Hard
My Calendar I
Medium
Rabbits in Forest6 Months
Medium
Rotate Image3 Months
Medium
Find Winner on a Tic Tac Toe Game
Easy
Exchange Seats
Medium
Find All Numbers Disappeared in an Array3 Months
Easy
Number of Visible People in a Queue
Hard
Middle of the Linked List3 Months
Easy
Valid Sudoku6 Months
Medium
Count Sub Islands
Medium
Longest Repeating Character Replacement3 Months
Medium
Maximum Profit in Job Scheduling
Hard
Minimum Number of K Consecutive Bit Flips
Hard
House Robber III
Medium
Number of 1 Bits6 Months
Easy
Permutation in String6 Months
Medium
Find All Anagrams in a String3 Months
Medium
Reverse Bits6 Months
Easy
Merge Two Binary Trees6 Months
Easy
Palindrome Partitioning II
Hard
Capacity To Ship Packages Within D Days6 Months
Medium
Random Pick with Weight30 Days
Medium
Sqrt(x)3 Months
Easy
Find the Prefix Common Array of Two Arrays
Medium
Group the People Given the Group Size They Belong To
Medium
Valid Palindrome II30 Days
Easy
Queue Reconstruction by Height
Medium
Maximum Number of Tasks You Can Assign
Hard
Wildcard Matching
Hard
Find Words That Can Be Formed by Characters
Easy
Divisor Game
Easy
Minimum Area Rectangle
Medium
IPO
Hard
Two Furthest Houses With Different Colors
Easy
Stock Price Fluctuation
Medium
First Unique Number
Medium
Maximum Sum BST in Binary Tree
Hard
One Edit Distance
Medium
Largest Number
Medium
Regular Expression Matching6 Months
Hard
Count Ways To Build Good Strings
Medium
Unique Paths II
Medium
Calculate Amount Paid in Taxes
Easy
Game of Life6 Months
Medium
Maximum Width Ramp
Medium
Reverse Nodes in Even Length Groups
Medium
Number of Ways to Form a Target String Given a Dictionary
Hard
Longest Increasing Path in a Matrix3 Months
Hard
Daily Temperatures3 Months
Medium
Remove Boxes
Hard
Students and Examinations6 Months
Easy
Longest Strictly Increasing or Strictly Decreasing Subarray
Easy
Convert Binary Number in a Linked List to Integer
Easy
First Missing Positive30 Days
Hard
Remove All Occurrences of a Substring6 Months
Medium
Maximum Swap3 Months
Medium
Count Elements With Maximum Frequency6 Months
Easy
Valid Word
Easy
Making A Large Island3 Months
Hard
Longest Common Subsequence6 Months
Medium
Populating Next Right Pointers in Each Node II3 Months
Medium
Add Binary30 Days
Easy
Web Crawler Multithreaded
Medium
Binary Tree Cameras
Hard
Bitwise ORs of Subarrays
Medium
Power Grid Maintenance6 Months
Medium
All O`one Data Structure
Hard
Two Sum II - Input Array Is Sorted6 Months
Medium
Number of Islands30 Days
Medium
Web Crawler
Medium
Walls and Gates6 Months
Medium
Word Search II6 Months
Hard
Burst Balloons
Hard
Range Sum Query 2D - Immutable
Medium
Closest Prime Numbers in Range
Medium
LRU Cache3 Months
Medium
Maximal Square
Medium
String Compression30 Days
Medium
Design Snake Game
Medium
Interval List Intersections3 Months
Medium
Trapping Rain Water II6 Months
Hard
Isomorphic Strings30 Days
Easy
Find All Possible Recipes from Given Supplies
Medium
Count Binary Substrings3 Months
Easy
Partition to K Equal Sum Subsets
Medium
Permutations30 Days
Medium
Partition Array Into Three Parts With Equal Sum
Easy
Linked List Cycle II
Medium
Merge Sorted Array30 Days
Easy
Restaurant Growth
Medium
Pascal's Triangle3 Months
Easy
Maximum Total Damage With Spell Casting
Medium
Single Number III
Medium
Count and Say
Medium
Sliding Window Median3 Months
Hard
Matrix Similarity After Cyclic Shifts
Easy
Find and Replace Pattern
Medium
Longest Common Prefix30 Days
Easy
Design In-Memory File System
Hard
Valid Perfect Square
Easy
Minimum Cost Path with Edge Reversals
Medium
Logger Rate Limiter
Easy
Insert Interval30 Days
Medium
Detect Cycles in 2D Grid
Medium
Check if a Parentheses String Can Be Valid
Medium
Maximum Sum of Distinct Subarrays With Length K
Medium
Valid Number3 Months
Hard
Find the Smallest Divisor Given a Threshold
Medium
Beautiful Towers I
Medium
Longest Arithmetic Subsequence
Medium
Shortest Bridge6 Months
Medium
Largest Plus Sign
Medium
Palindromic Substrings30 Days
Medium
Exclusive Time of Functions30 Days
Medium
Max Sum of a Pair With Equal Sum of Digits
Medium
Successful Pairs of Spells and Potions6 Months
Medium
Minimum Number of Refueling Stops
Hard
Find the Index of the First Occurrence in a String6 Months
Easy
Snakes and Ladders
Medium
Last Person to Fit in the Bus
Medium
Heaters
Medium
Product of the Last K Numbers6 Months
Medium
Leftmost Column with at Least a One
Medium
Angle Between Hands of a Clock
Medium
Maximum Earnings From Taxi
Medium
Non-overlapping Intervals6 Months
Medium
Basic Calculator3 Months
Hard
Single Element in a Sorted Array3 Months
Medium
LFU Cache
Hard
Rotting Oranges3 Months
Medium
Satisfiability of Equality Equations
Medium
Two Sum30 Days
Easy
Move Zeroes30 Days
Easy
Guess the Word3 Months
Hard
Height Checker
Easy
Combination Sum3 Months
Medium
Roman to Integer3 Months
Easy
Search in Rotated Sorted Array3 Months
Medium
Longest Valid Parentheses3 Months
Hard
Design Circular Queue
Medium
Backspace String Compare
Easy
Collect Coins in a Tree
Hard
Remove K Digits6 Months
Medium
Bus Routes
Hard
Set Matrix Zeroes3 Months
Medium
Restore IP Addresses
Medium
Shortest Path in Binary Matrix3 Months
Medium
Find Minimum Time to Reach Last Room I
Medium
Container With Most Water3 Months
Medium
Fair Candy Swap3 Months
Easy
Toeplitz Matrix3 Months
Easy
Insert Delete GetRandom O(1)6 Months
Medium
Lemonade Change
Easy
Max Points on a Line
Hard
Course Schedule3 Months
Medium
Search a 2D Matrix II
Medium
Rectangle Overlap
Easy
Minimize the Maximum Difference of Pairs
Medium
Divide Nodes Into the Maximum Number of Groups
Hard
Split a String in Balanced Strings3 Months
Easy
Shifting Letters II
Medium
Cherry Pickup
Hard
The Skyline Problem6 Months
Hard
Maximum Subarray3 Months
Medium
Design Parking System
Easy
Count Subarrays With Fixed Bounds
Hard
Fraction Addition and Subtraction
Medium
Path With Minimum Effort6 Months
Medium
Department Highest Salary
Medium
Average Waiting Time
Medium
Squares of a Sorted Array6 Months
Easy
Word Ladder6 Months
Hard
Count Square Submatrices with All Ones
Medium
Contains Duplicate3 Months
Easy
Edit Distance
Medium
Count Complete Subarrays in an Array
Medium
Kth Largest Element in a Stream6 Months
Easy
Decode String6 Months
Medium
Minimum Absolute Difference Between Elements With Constraint6 Months
Medium
Bulls and Cows
Medium
Reverse Words in a String30 Days
Medium
Intersection of Two Linked Lists3 Months
Easy
Split Message Based on Limit
Hard
Loud and Rich
Medium
Shuffle an Array
Medium
Minimum Time to Collect All Apples in a Tree6 Months
Medium
Implement Stack using Queues6 Months
Easy
Average Selling Price6 Months
Easy
Merge k Sorted Lists30 Days
Hard
Reorder List6 Months
Medium
Find the Duplicate Number3 Months
Medium
Greatest Common Divisor of Strings6 Months
Easy
Encode and Decode TinyURL
Medium
Find Users With Valid E-Mails
Easy
Decode Ways II
Hard
Sum of Nodes with Even-Valued Grandparent
Medium
Convert Binary Search Tree to Sorted Doubly Linked List30 Days
Medium
Remove Max Number of Edges to Keep Graph Fully Traversable
Hard
Grid Teleportation Traversal
Medium
Final Prices With a Special Discount in a Shop
Easy
Integer to Roman3 Months
Medium
Replace Elements with Greatest Element on Right Side
Easy
Contiguous Array3 Months
Medium
Remove Invalid Parentheses3 Months
Hard
Partition Equal Subset Sum3 Months
Medium
Best Time to Buy and Sell Stock II6 Months
Medium
Score of Parentheses
Medium
Construct Binary Tree from Inorder and Postorder Traversal
Medium
Divide Array Into Arrays With Max Difference
Medium
Find Duplicate Subtrees
Medium
Implement Trie (Prefix Tree)
Medium
Word Break II
Hard
Course Schedule IV
Medium
Rotate Array6 Months
Medium
Make Sum Divisible by P
Medium
Zigzag Grid Traversal With Skip
Easy
Sum of Subarray Minimums
Medium
Construct Binary Tree from String6 Months
Medium
Online Stock Span
Medium
The Maze II6 Months
Medium
Binary Tree Right Side View3 Months
Medium
Find All Duplicates in an Array
Medium
Combine Two Tables6 Months
Easy
Diagonal Traverse II6 Months
Medium
Make The String Great
Easy
Palindrome Permutation
Easy
Monotonic Array6 Months
Easy
Missing Ranges6 Months
Easy
Number of Recent Calls3 Months
Easy
The Maze
Medium
Pairs of Songs With Total Durations Divisible by 60
Medium
Minimum Cost Path with Teleportations3 Months
Hard
Concatenation of Array30 Days
Easy
Top K Frequent Elements30 Days
Medium
Merge Two Sorted Lists30 Days
Easy
Image Smoother
Easy
HTML Entity Parser
Medium
Reconstruct Itinerary
Hard
Minimum Time to Complete Trips
Medium
Race Car
Hard
Flatten Deeply Nested Array
Medium
Leaf-Similar Trees
Easy
Median of Two Sorted Arrays30 Days
Hard
Multiply Strings
Medium
Count Square Sum Triples6 Months
Easy
Linked List Random Node
Medium
Intersection of Multiple Arrays
Easy
Palindrome Number30 Days
Easy
Diagonal Traverse3 Months
Medium
Largest Rectangle in Histogram6 Months
Hard
Permutations II
Medium
Add Two Numbers3 Months
Medium
Rectangle Area
Medium
Parallel Courses
Medium
Sum of Square Numbers
Medium
Longest Substring with At Most K Distinct Characters
Medium
Find Duplicate File in System6 Months
Medium
Subsets II6 Months
Medium
Remove All Adjacent Duplicates in String II6 Months
Medium
Number of Digit One
Hard
Number of Matching Subsequences
Medium
Dungeon Game6 Months
Hard
Subarrays with K Different Integers
Hard
Island Perimeter
Easy
Flood Fill3 Months
Easy
Moving Average from Data Stream30 Days
Easy
Regions Cut By Slashes
Medium
Minimum Remove to Make Valid Parentheses30 Days
Medium
Immediate Food Delivery II
Medium
Construct K Palindrome Strings
Medium
Palindrome Partitioning3 Months
Medium
Check If Array Pairs Are Divisible by k
Medium
Triangle6 Months
Medium
Find Minimum Time to Finish All Jobs
Hard
Subarray Sum Equals K30 Days
Medium
Minimum Score Triangulation of Polygon6 Months
Medium
Reverse Nodes in k-Group6 Months
Hard
Recyclable and Low Fat Products3 Months
Easy
Remove Zero Sum Consecutive Nodes from Linked List
Medium
Sum of Two Integers
Medium
N-Queens3 Months
Hard
Maximum Number of Occurrences of a Substring
Medium
Decode the Message
Easy
Delete Node in a BST6 Months
Medium
Number of Students Unable to Eat Lunch
Easy
Longest Substring with At Most Two Distinct Characters
Medium
Shortest Palindrome
Hard
Maximum Units on a Truck
Easy
Minimum Operations to Reduce X to Zero
Medium
Validate Stack Sequences3 Months
Medium
Word Search3 Months
Medium
Maximal Rectangle3 Months
Hard
Symmetric Tree6 Months
Easy
All Ancestors of a Node in a Directed Acyclic Graph
Medium
Evaluate Division
Medium
Consecutive Numbers
Medium
Decode Ways3 Months
Medium
Design Hit Counter3 Months
Medium
Fibonacci Number3 Months
Easy
UTF-8 Validation
Medium
Same Tree30 Days
Easy
Gas Station6 Months
Medium
Trips and Users
Hard
Binary Tree Maximum Path Sum6 Months
Hard
Delete Nodes And Return Forest
Medium
Valid Anagram3 Months
Easy
Minimum Operations to Exceed Threshold Value II
Medium
Valid Palindrome30 Days
Easy
Minimum Operations to Make Binary Array Elements Equal to One I
Medium
Find the Town Judge
Easy
Letter Combinations of a Phone Number30 Days
Medium
Largest Local Values in a Matrix
Easy
Majority Element3 Months
Easy
Minimum Absolute Difference3 Months
Easy
3Sum30 Days
Medium
Lowest Common Ancestor of a Binary Tree30 Days
Medium
All Paths From Source to Target
Medium
3Sum Closest6 Months
Medium
Best Time to Buy and Sell Stock30 Days
Easy
Design Add and Search Words Data Structure
Medium
Minimum Path Sum
Medium
Reverse String3 Months
Easy
Simplify Path30 Days
Medium
Shortest Common Supersequence
Hard
Remove Linked List Elements
Easy
Candy Crush
Medium
Jump Game30 Days
Medium
Maximum Score From Removing Substrings
Medium
Find the Number of Ways to Place People II
Hard
Sort Colors6 Months
Medium
Group Anagrams3 Months
Medium
Shortest Path with Alternating Colors
Medium
Max Consecutive Ones III30 Days
Medium
Network Delay Time
Medium
Find the City With the Smallest Number of Neighbors at a Threshold Distance
Medium
Add to Array-Form of Integer
Easy
Odd Even Linked List6 Months
Medium
Sum of Unique Elements
Easy
Interleaving String
Medium
Missing Number6 Months
Easy
Implement Queue using Stacks
Easy
Continuous Subarray Sum3 Months
Medium
Maximum Product of Three Numbers
Easy
Tallest Billboard
Hard
Longest Increasing Subsequence3 Months
Medium
Number of Islands II
Hard
Binary Tree Zigzag Level Order Traversal
Medium
Validate Binary Search Tree6 Months
Medium
Add Digits3 Months
Easy
Remove Duplicates from Sorted Array3 Months
Easy
How Many Numbers Are Smaller Than the Current Number
Easy
Most Profitable Path in a Tree
Medium
Car Fleet6 Months
Medium
Delete and Earn
Medium
Remove Nth Node From End of List3 Months
Medium
Count Nodes Equal to Average of Subtree6 Months
Medium
Arranging Coins6 Months
Easy
Find Peak Element30 Days
Medium
Count the Number of Good Subarrays
Medium
Relative Sort Array
Easy
Fraction to Recurring Decimal6 Months
Medium
Number of Ways to Split Array
Medium
Intersection of Two Arrays3 Months
Easy
Best Time to Buy and Sell Stock using Strategy6 Months
Medium
Convert a Number to Hexadecimal6 Months
Easy
Missing Element in Sorted Array6 Months
Medium
Fruit Into Baskets
Medium
House Robber II6 Months
Medium
Patching Array6 Months
Hard
Reverse Only Letters
Easy
Minimum Number of Removals to Make Mountain Array
Hard
Sort Array by Increasing Frequency
Easy
Is Subsequence6 Months
Easy
N-Repeated Element in Size 2N Array
Easy
Maximum Population Year
Easy
Best Time to Buy and Sell Stock with Transaction Fee
Medium
Count Number of Nice Subarrays
Medium
Unique Paths III6 Months
Hard
Path Sum II6 Months
Medium
Number of Provinces3 Months
Medium
Reverse Vowels of a String3 Months
Easy
Remove Element6 Months
Easy
Expression Add Operators3 Months
Hard
Kth Largest Element in an Array30 Days
Medium
Cutting Ribbons
Medium
3Sum Smaller
Medium
Find Customer Referee
Easy
Find First and Last Position of Element in Sorted Array30 Days
Medium
Minimum Falling Path Sum
Medium
Count Good Numbers6 Months
Medium
Count Pairs Whose Sum is Less than Target
Easy
Prefix and Suffix Search
Hard
Debounce
Medium
Coin Change30 Days
Medium
Word Subsets
Medium
Ugly Number II
Medium
Count Nice Pairs in an Array
Medium
Nearest Exit from Entrance in Maze
Medium
Next Greater Element III
Medium
Maximum Number of Events That Can Be Attended
Medium
Paint Fence
Medium
Stickers to Spell Word
Hard
Product Sales Analysis I
Easy
Count Servers that Communicate
Medium
01 Matrix3 Months
Medium
Word Pattern6 Months
Easy
Add Bold Tag in String
Medium
Max Area of Island3 Months
Medium
Function Composition
Easy
Cheapest Flights Within K Stops
Medium
Reverse Pairs6 Months
Hard
Next Greater Element II
Medium
Decrypt String from Alphabet to Integer Mapping
Easy
Diameter of N-Ary Tree
Medium
Distinct Subsequences
Hard
Sliding Puzzle
Hard
Single Number II3 Months
Medium
Flip String to Monotone Increasing
Medium
Rotate String6 Months
Easy
Search Insert Position3 Months
Easy
Add Two Numbers II6 Months
Medium
Minimum Insertion Steps to Make a String Palindrome
Hard
Shuffle the Array
Easy
Reverse Linked List II30 Days
Medium
Sum of Digits of String After Convert
Easy
Number of Submatrices That Sum to Target
Hard
Best Time to Buy and Sell Stock III30 Days
Hard
Count Odd Numbers in an Interval Range
Easy
Is Graph Bipartite?
Medium
Number of Distinct Islands
Medium
Lowest Common Ancestor of Deepest Leaves6 Months
Medium
Fizz Buzz3 Months
Easy
Populating Next Right Pointers in Each Node3 Months
Medium
Minimum Fuel Cost to Report to the Capital
Medium
Find Score of an Array After Marking All Elements
Medium
Shortest Unsorted Continuous Subarray
Medium
Binary Tree Longest Consecutive Sequence6 Months
Medium
Cinema Seat Allocation
Medium
Delete Node in a Linked List3 Months
Medium
Flatten Binary Tree to Linked List
Medium
Plus One3 Months
Easy
Create a DataFrame from List
Easy
Sort List6 Months
Medium
Number of Closed Islands
Medium
First Unique Character in a String6 Months
Easy
Project Employees I
Easy
4Sum3 Months
Medium
Rotated Digits
Medium
Remove Duplicate Letters
Medium
Min Cost to Connect All Points
Medium
Can Place Flowers6 Months
Easy
Shortest Path in a Hidden Grid
Medium
Duplicate Emails3 Months
Easy
Range Sum of BST3 Months
Easy
132 Pattern
Medium
Reverse Words in a String III
Easy
Long Pressed Name
Easy
Search in Rotated Sorted Array II
Medium
Intersection of Two Arrays II6 Months
Easy
Excel Sheet Column Title
Easy
Spiral Matrix II6 Months
Medium
Power of Two3 Months
Easy
Dot Product of Two Sparse Vectors30 Days
Medium
Reverse Integer30 Days
Medium
Meeting Rooms III6 Months
Hard
Tree Diameter
Medium
Find the Winner of the Circular Game
Medium
Check If Two String Arrays are Equivalent
Easy
Substrings of Size Three with Distinct Characters
Easy
Champagne Tower
Medium
Integer to English Words
Hard
Longest Duplicate Substring
Hard
Water Bottles6 Months
Easy
Time Needed to Buy Tickets
Easy
Word Break3 Months
Medium
Merge Strings Alternately3 Months
Easy
Minimum Size Subarray Sum
Medium
Minimum Time Difference
Medium
Smallest Subtree with all the Deepest Nodes3 Months
Medium
Sudoku Solver6 Months
Hard
Find Minimum in Rotated Sorted Array6 Months
Medium
Longest Consecutive Sequence3 Months
Medium
Remove All Adjacent Duplicates In String3 Months
Easy
Path with Maximum Gold
Medium
Happy Number6 Months
Easy
Divide Two Integers6 Months
Medium
Maximum Points You Can Obtain from Cards6 Months
Medium
Minimum Number of Swaps to Make the String Balanced
Medium
Number of Longest Increasing Subsequence
Medium
Boundary of Binary Tree3 Months
Medium
House Robber6 Months
Medium
Find Missing and Repeated Values
Easy
Design File System
Medium
Find the Highest Altitude
Easy
Contains Duplicate II30 Days
Easy
Sum Root to Leaf Numbers30 Days
Medium
Vertical Order Traversal of a Binary Tree30 Days
Hard
Restore the Array From Adjacent Pairs3 Months
Medium
Next Greater Element I30 Days
Easy
Find K Pairs with Smallest Sums
Medium
Sliding Window Maximum3 Months
Hard
Subsets3 Months
Medium
Length of Last Word3 Months
Easy
Design Linked List
Medium
Reorganize String
Medium
Combinations30 Days
Medium
Check if Array Is Sorted and Rotated30 Days
Easy
Lowest Common Ancestor of a Binary Search Tree6 Months
Medium
Non-decreasing Array
Medium
String to Integer (atoi)3 Months
Medium
Last Stone Weight
Easy
Sum of Beauty of All Substrings6 Months
Medium
K-diff Pairs in an Array
Medium
Department Top Three Salaries
Hard
Defanging an IP Address
Easy
Minimum Cost to Make at Least One Valid Path in a Grid
Hard
Maximum Product of Splitted Binary Tree3 Months
Medium
Find the Longest Substring Containing Vowels in Even Counts
Medium
Valid Word Abbreviation30 Days
Easy
Coin Change II3 Months
Medium
Unique Paths3 Months
Medium
Number of Substrings Containing All Three Characters
Medium
Combination Sum II3 Months
Medium
N-th Tribonacci Number3 Months
Easy
Target Sum6 Months
Medium
Find Center of Star Graph
Easy
Design Memory Allocator
Medium
Insert into a Binary Search Tree
Medium
Max Consecutive Ones3 Months
Easy
Sort an Array
Medium
Valid Arrangement of Pairs
Hard
Jewels and Stones
Easy
Rising Temperature6 Months
Easy
Assign Cookies
Easy
Delete the Middle Node of a Linked List
Medium
Step-By-Step Directions From a Binary Tree Node to Another
Medium
Find Missing Observations
Medium
Remove Digit From Number to Maximize Result
Easy
Product of Two Run-Length Encoded Arrays3 Months
Medium
Palindrome Linked List3 Months
Easy
Summary Ranges
Easy
Sentence Similarity III
Medium
Length of Longest Subarray With at Most K Frequency
Medium
Strong Password Checker
Hard
Candy3 Months
Hard
Number of Good Pairs
Easy
The k-th Lexicographical String of All Happy Strings of Length n
Medium
Balanced Binary Tree30 Days
Easy
Article Views I6 Months
Easy
Text Justification6 Months
Hard
Cousins in Binary Tree
Easy
Find Lucky Integer in an Array6 Months
Easy
Add Two Integers
Easy
Reorder Routes to Make All Paths Lead to the City Zero
Medium
Longest Mountain in Array
Medium
Ugly Number
Easy
Convert Sorted Array to Binary Search Tree6 Months
Easy
Delete Duplicate Emails6 Months
Easy
Find N Unique Integers Sum up to Zero
Easy
Keys and Rooms
Medium
Find Bottom Left Tree Value
Medium
Random Pick Index6 Months
Medium
Find Median from Data Stream6 Months
Hard
Divide Array Into Equal Pairs
Easy
Count Good Nodes in Binary Tree
Medium
Employee Bonus3 Months
Easy
Best Time to Buy and Sell Stock IV
Hard
Sort Characters By Frequency6 Months
Medium
Height of Binary Tree After Subtree Removal Queries
Hard
Longest Palindromic Subsequence
Medium
Longest Continuous Increasing Subsequence
Easy
Add Strings3 Months
Easy
Scramble String
Hard
Game Play Analysis IV6 Months
Medium
Sum of Left Leaves
Easy
Construct Binary Search Tree from Preorder Traversal
Medium
Friend Requests I: Overall Acceptance Rate
Easy
Flipping an Image3 Months
Easy
Find in Mountain Array
Hard
Most Stones Removed with Same Row or Column
Medium
Parsing A Boolean Expression
Hard
Reported Posts
Easy
Project Employees II
Easy
Find the Kth Smallest Sum of a Matrix With Sorted Rows
Hard
Put Marbles in Bags
Hard
Repeated Substring Pattern
Easy
Meeting Rooms
Easy
Maximum Matrix Sum3 Months
Medium
Integer Break6 Months
Medium
Wiggle Sort II
Medium
Binary Tree Level Order Traversal3 Months
Medium
Kth Smallest Number in Multiplication Table
Hard
Maximum Binary Tree II
Medium
Find the Most Common Response
Medium
Apples & Oranges
Medium
Remove Duplicates from Sorted List3 Months
Easy
Percentage of Users Attended a Contest6 Months
Easy
Maximum Binary Tree6 Months
Medium
Max Number of K-Sum Pairs
Medium
Number Of Corner Rectangles
Medium
Min Cost Climbing Stairs6 Months
Easy
Shifting Letters
Medium
Find Common Elements Between Two Arrays
Easy
Continuous Subarrays
Medium
Nth Digit
Medium
Unique Number of Occurrences3 Months
Easy
Replace Employee ID With The Unique Identifier
Easy
Closest Binary Search Tree Value3 Months
Easy
Primary Department for Each Employee
Easy
Maximum Gap6 Months
Medium
Invert Binary Tree
Easy
Minimum Deletions for At Most K Distinct Characters
Easy
Combination Sum IV
Medium
Create Hello World Function6 Months
Easy
Faulty Sensor
Easy
Number of Comments per Post
Easy
Product Price at a Given Date6 Months
Medium
Count of Smaller Numbers After Self
Hard
Russian Doll Envelopes
Hard
Kids With the Greatest Number of Candies6 Months
Easy
Bitwise OR of Even Numbers in an Array
Easy
Count the Number of Fair Pairs
Medium
Ads Performance
Easy
Possible Bipartition
Medium
Reported Posts II
Medium
Moving Stones Until Consecutive
Medium
Customers Who Never Order
Easy
Boats to Save People6 Months
Medium
Accounts Merge6 Months
Medium
Find if Path Exists in Graph
Easy
Valid Triangle Number6 Months
Medium
Project Employees III
Medium
Maximum Compatibility Score Sum
Medium
Employees Earning More Than Their Managers30 Days
Easy
The kth Factor of n
Medium
Count Primes6 Months
Medium
Kth Missing Positive Number6 Months
Easy
Remove Duplicates from Sorted List II
Medium
Design Search Autocomplete System
Hard
Maximum Candies Allocated to K Children6 Months
Medium
Longest Balanced Substring II3 Months
Medium
Smallest Integer Divisible by K6 Months
Medium
Bulb Switcher6 Months
Medium
Find Pivot Index6 Months
Easy
Find the Original Typed String I
Easy
Counting Bits6 Months
Easy
Subarray Sums Divisible by K
Medium
Simple Bank System30 Days
Medium
Number of Operations to Make Network Connected
Medium
Split Linked List in Parts
Medium
Subtree of Another Tree
Easy
Largest Divisible Subset3 Months
Medium
Search in a Binary Search Tree
Easy
Surrounded Regions6 Months
Medium
Return Length of Arguments Passed
Easy
Remove Outermost Parentheses
Easy
Peak Index in a Mountain Array6 Months
Medium
Swap Nodes in Pairs3 Months
Medium
Find the Difference
Easy
Max Pair Sum in an Array
Easy
Longest Subsequence Repeated k Times
Hard
2 Keys Keyboard
Medium
Design an Ordered Stream
Easy
Maximum Number of Darts Inside of a Circular Dartboard
Hard
Minimum Path Cost in a Hidden Grid
Medium
Customers Who Bought Products A and B but Not C
Medium
Read N Characters Given read4 II - Call Multiple Times
Hard
Repeated DNA Sequences6 Months
Medium
Count the Number of Substrings With Dominant Ones
Medium
Maximum Average Subarray I3 Months
Easy
Repeated String Match
Medium
Shortest Subarray with Sum at Least K
Hard
Custom Sort String3 Months
Medium
Meeting Scheduler
Medium
Strong Friendship3 Months
Medium
Moving Stones Until Consecutive II
Medium
Page Recommendations II
Hard
24 Game
Hard
Maximum Nesting Depth of the Parentheses6 Months
Easy
Partition List
Medium
Find the Lexicographically Largest String From the Box I
Medium
Complete Binary Tree Inserter
Medium
Maximum Performance of a Team
Hard
Report Contiguous Dates
Hard
Get Highest Answer Rate Question
Medium
House Robber IV
Medium
Factorial Trailing Zeroes
Medium
Construct String With Repeat Limit
Medium
Count Nodes Equal to Sum of Descendants
Medium
Design Ride Sharing System
Medium
Steps to Make Array Non-decreasing
Medium
Minimum Cost to Reach Destination in Time
Hard
Identify the Largest Outlier in an Array
Medium
Merge Two 2D Arrays by Summing Values
Easy
Smallest Missing Integer Greater Than Sequential Prefix Sum
Easy
Perfect Number
Easy
Finding the Topic of Each Post
Hard
Lexicographical Numbers
Medium
Guess Number Higher or Lower
Easy
Classes With at Least 5 Students
Easy
Sign of the Product of an Array
Easy
Unique Length-3 Palindromic Subsequences
Medium
Minimum Number of Changes to Make Binary String Beautiful
Medium
Largest BST Subtree6 Months
Medium
Friend Requests II: Who Has the Most Friends6 Months
Medium
Find Words Containing Character
Easy
Max Dot Product of Two Subsequences3 Months
Hard
Page Recommendations
Medium
Binary Tree Inorder Traversal6 Months
Easy
Maximum Difference Between Even and Odd Frequency II
Hard
Contains Duplicate III
Hard
Spiral Matrix III
Medium
Find the Maximum Length of Valid Subsequence II
Medium
Recover Binary Search Tree
Medium
Two Best Non-Overlapping Events3 Months
Medium
Minimum Pair Removal to Sort Array I30 Days
Easy
Swapping Nodes in a Linked List6 Months
Medium
Valid Mountain Array3 Months
Easy
Binary Tree Vertical Order Traversal30 Days
Medium
Not Boring Movies3 Months
Easy
Binary Search Tree Iterator3 Months
Medium
Minimum Number of Operations to Move All Balls to Each Box
Medium
Element Appearing More Than 25% In Sorted Array
Easy
Valid Palindrome III3 Months
Hard
Number of Valid Words in a Sentence
Easy
Magnetic Force Between Two Balls
Medium
Maximum Frequency Stack
Hard
Minimum Add to Make Parentheses Valid3 Months
Medium
Strobogrammatic Number6 Months
Easy
Sum of Subarray Ranges
Medium
Minesweeper3 Months
Medium
Letter Tile Possibilities
Medium
Human Traffic of Stadium6 Months
Hard
Frequency of the Most Frequent Element6 Months
Medium
Search a 2D Matrix3 Months
Medium
Count Complete Tree Nodes
Easy
Employee Free Time
Hard
Nim Game
Easy
Paint House II
Hard
Linked List Cycle6 Months
Easy
Minimum Difference in Sums After Removal of Elements
Hard
Maximum Width of Binary Tree
Medium
Linked List Components
Medium
Power of Three
Easy
Longest Palindrome
Easy
Super Pow
Medium
Find the Difference of Two Arrays
Easy
Cherry Pickup II6 Months
Hard
Confirmation Rate3 Months
Medium
Evaluate Reverse Polish Notation3 Months
Medium
Shortest Subarray to be Removed to Make Array Sorted
Medium
Ones and Zeroes
Medium
Increasing Triplet Subsequence3 Months
Medium
Find the Minimum and Maximum Number of Nodes Between Critical Points
Medium
Redundant Connection
Medium
Ransom Note6 Months
Easy
Remove Duplicates from Sorted Array II
Medium
Find Eventual Safe States
Medium
Path Sum
Easy
K Radius Subarray Averages
Medium
Minimum Number of Taps to Open to Water a Garden
Hard
Find Subsequence of Length K With the Largest Sum
Easy
Binary Subarrays With Sum3 Months
Medium
Binary Search3 Months
Easy
Nested List Weight Sum30 Days
Medium
First Bad Version30 Days
Easy
Maximum Number of Points From Grid Queries
Hard
Threshold Majority Queries
Hard
Lowest Common Ancestor of a Binary Tree II
Medium
Reordered Power of 2
Medium
Intersection of Three Sorted Arrays
Easy
Maximum Manhattan Distance After K Changes
Medium
Construct String from Binary Tree
Medium
Maximum Difference Between Even and Odd Frequency I
Easy
Minimum Number of Increments on Subarrays to Form a Target Array
Hard
Can I Win
Medium
Count Negative Numbers in a Sorted Matrix6 Months
Easy
Range Sum Query - Immutable3 Months
Easy
Partition Labels6 Months
Medium
Minimum Cost to Cut a Stick
Hard
Valid Parenthesis String3 Months
Medium
Path with Maximum Probability
Medium
Insert into a Sorted Circular Linked List6 Months
Medium
Big Countries6 Months
Easy
Binary Tree Preorder Traversal
Easy
Count Hills and Valleys in an Array
Easy
K-th Smallest in Lexicographical Order
Hard
Running Sum of 1d Array6 Months
Easy
Flatten Nested List Iterator6 Months
Medium
Find a Corresponding Node of a Binary Tree in a Clone of That Tree6 Months
Easy
Strobogrammatic Number II6 Months
Medium
To Be Or Not To Be
Easy
Different Ways to Add Parentheses
Medium
Minimum Insertions to Balance a Parentheses String
Medium
Sparse Matrix Multiplication3 Months
Medium
Find the Celebrity
Medium
Rotate List6 Months
Medium
Groups of Special-Equivalent Strings
Medium
Separate the Digits in an Array
Easy
Maximum Score After Splitting a String
Easy
Maximum Unique Subarray Sum After Deletion
Easy
Arithmetic Slices
Medium
String Compression III
Medium
Most Profit Assigning Work
Medium
Count Items Matching a Rule
Easy
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Medium
Lowest Common Ancestor of a Binary Tree III3 Months
Medium
Design Twitter
Medium
Shortest Path in a Grid with Obstacles Elimination6 Months
Hard
Binary Search Tree Iterator II
Medium
Set Mismatch6 Months
Easy
Calculate Money in Leetcode Bank
Easy
Richest Customer Wealth
Easy
Maximum Average Pass Ratio
Medium
H-Index
Medium
Lexicographically Minimum String After Removing Stars
Medium
Rearranging Fruits
Hard
Counter
Easy
Single-Threaded CPU
Medium
Single Number3 Months
Easy
Longest Substring with At Least K Repeating Characters
Medium
Stone Game II
Medium
Balance a Binary Search Tree30 Days
Medium
Game Play Analysis I
Easy
Design a Text Editor6 Months
Hard
Count of Range Sum3 Months
Hard
Words Within Two Edits of Dictionary
Medium
Pascal's Triangle II
Easy
Task Scheduler II
Medium
Strange Printer
Hard
Minimum Depth of Binary Tree
Easy
Apply Discount Every n Orders
Medium
H-Index II
Medium
Score of a String
Easy
Merge In Between Linked Lists
Medium
Construct Binary Tree from Preorder and Inorder Traversal3 Months
Medium
Rank Scores6 Months
Medium
Buildings With an Ocean View3 Months
Medium
Third Maximum Number6 Months
Easy
Binary Tree Level Order Traversal II
Medium
Hand of Straights
Medium
Matchsticks to Square
Medium
Maximum Size Subarray Sum Equals k
Medium
Max Consecutive Ones II
Medium
Robot Room Cleaner3 Months
Hard
Three Consecutive Odds6 Months
Easy
Find the XOR of Numbers Which Appear Twice6 Months
Easy
Minimum Falling Path Sum II
Hard
Find the Maximum Length of Valid Subsequence I
Medium
Set Intersection Size At Least Two6 Months
Hard
Push Dominoes
Medium
Construct the Lexicographically Largest Valid Sequence
Medium
Sum of Root To Leaf Binary Numbers
Easy
Count Symmetric Integers6 Months
Easy
Minimum Addition to Make Integer Beautiful
Medium
Maximum Difference by Remapping a Digit
Easy
Nth Magical Number6 Months
Hard
Valid Phone Numbers
Easy
Reach a Number
Medium
Minimum Absolute Difference in BST
Easy
Array Prototype Last6 Months
Easy
Fix Names in a Table
Easy
Compute Decimal Representation6 Months
Easy
Greatest Sum Divisible by Three6 Months
Medium
Delete Columns to Make Sorted6 Months
Easy
Sort the People
Easy
Inorder Successor in BST II
Medium
Find the Maximum Sum of Node Values
Hard
Add Two Promises
Easy
Super Ugly Number
Medium
Defuse the Bomb6 Months
Easy
Keep Multiplying Found Values by Two6 Months
Easy
Minimum Array End
Medium
Find the Shortest Superstring
Hard
Minimum Length of String After Deleting Similar Ends6 Months
Medium
X of a Kind in a Deck of Cards
Easy
Ugly Number III
Medium
Maximum Sum of 3 Non-Overlapping Subarrays
Hard
Complex Number Multiplication
Medium
Apply Operations to an Array
Easy
Sort Vowels in a String
Medium
Minimum Time to Repair Cars
Medium
Count Subarrays Where Max Element Appears at Least K Times
Medium
Employees Whose Manager Left the Company
Easy
Maximum Absolute Sum of Any Subarray3 Months
Medium
Adding Spaces to a String
Medium
Remove Nodes From Linked List
Medium
Most Common Word
Easy
Take Gifts From the Richest Pile
Easy
Binary Tree Postorder Traversal
Easy
Reorder Data in Log Files
Medium
Transpose File
Medium
Detect Squares
Medium
Mini Parser
Medium
Rank Transform of an Array6 Months
Easy
The K Weakest Rows in a Matrix
Easy
Find the Minimum Amount of Time to Brew Potions6 Months
Medium
Trionic Array I3 Months
Easy
Vowels Game in a String
Medium
Binary Tree Pruning
Medium
Find Largest Value in Each Tree Row
Medium
Find X-Sum of All K-Long Subarrays I
Easy
Crawler Log Folder
Easy
Maximum XOR of Two Numbers in an Array
Medium
Counting Words With a Given Prefix
Easy
Egg Drop With 2 Eggs and N Floors
Medium
Check If All 1's Are at Least Length K Places Away
Easy
Find Most Frequent Vowel and Consonant6 Months
Easy
Minimum Removals to Balance Array30 Days
Medium
Design Circular Deque
Medium
Number of Subsequences That Satisfy the Given Sum Condition
Medium
Last Stone Weight II6 Months
Medium
Number of Laser Beams in a Bank
Medium
Check If a String Contains All Binary Codes of Size K
Medium
Divisible and Non-divisible Sums Difference
Easy
Maximum and Minimum Sums of at Most Size K Subsequences
Medium
Read N Characters Given Read4
Easy
Check if an Original String Exists Given Two Encoded Strings
Hard
Longest Palindrome by Concatenating Two Letter Words
Medium
Minimum Score After Removals on a Tree
Hard
Array Partition
Easy
Count Number of Rectangles Containing Each Point
Medium
String Matching in an Array
Easy
Maximum Value of an Ordered Triplet I
Easy
Eliminate Maximum Number of Monsters
Medium
Longest Repeating Substring
Medium
Sum of Absolute Differences in a Sorted Array
Medium
Remove Covered Intervals
Medium
Jump Game IV
Hard
Check if Two Chessboard Squares Have the Same Color
Easy
Construct Smallest Number From DI String
Medium
Find Minimum in Rotated Sorted Array II
Hard
Smallest Range II
Medium
Apply Operations to Make All Array Elements Equal to Zero
Medium
Number of Distinct Islands II
Hard
Number of Ways to Paint N × 3 Grid3 Months
Hard
Special Array With X Elements Greater Than or Equal X
Easy
Reverse String II
Easy
Minimum Cost to Hire K Workers
Hard
Number of Wonderful Substrings
Medium
Distant Barcodes6 Months
Medium
Number of Even and Odd Bits
Easy
Find the Peaks
Easy
Maximum Matching of Players With Trainers
Medium
Maximum Number of Fish in a Grid
Medium
4Sum II
Medium
Find Smallest Letter Greater Than Target3 Months
Easy
Longest Happy Prefix
Hard
Minimum Domino Rotations For Equal Row
Medium
Shortest Path Visiting All Nodes
Hard
Minimum Time Visiting All Points3 Months
Easy
Maximum Erasure Value
Medium
Count Special Triplets6 Months
Medium
Insert Greatest Common Divisors in Linked List
Medium
Maximum Difference Between Node and Ancestor
Medium
Maximum Running Time of N Computers3 Months
Hard
Minimum Number of Operations to Make Array XOR Equal to K
Medium
Customers Who Bought All Products
Medium
Clear Digits
Easy
Find All K-Distant Indices in an Array
Easy
Extra Characters in a String
Medium
Valid Palindrome IV
Medium
RLE Iterator
Medium
Average of Levels in Binary Tree
Easy
Reshape the Matrix
Easy
Find the Original Typed String II
Hard
Jump Game VI
Medium
Count Subarrays of Length Three With a Condition
Easy
Minimum Operations to Convert All Elements to Zero
Medium
Sort Array By Parity3 Months
Easy
Check Completeness of a Binary Tree6 Months
Medium
Total Hamming Distance6 Months
Medium
Number of Common Factors
Easy
Build Array from Permutation
Easy
Water Bottles II
Medium
Maximum Difference Between Increasing Elements
Easy
Lowest Common Ancestor of a Binary Tree IV
Medium
Convert the Temperature
Easy
Check if One String Swap Can Make Strings Equal
Easy
Count Partitions With Max-Min Difference at Most K3 Months
Medium
Separate Squares I6 Months
Medium
Sales Person
Easy
Check Knight Tour Configuration
Medium
Convert BST to Greater Tree
Medium
Convert 1D Array Into 2D Array
Easy
Length of the Longest Valid Substring
Hard
Minimum Number of Operations to Make Array Empty
Medium
Reformat Department Table
Easy
Stone Game
Medium
Minimum Swaps To Make Sequences Increasing
Hard
Number of Pairs Satisfying Inequality
Hard
Minimum Number of Vertices to Reach All Nodes6 Months
Medium
Find the Number of Ways to Place People I
Medium
Check if Number is a Sum of Powers of Three
Medium
Check If Digits Are Equal in String After Operations I6 Months
Easy
Sum of Total Strength of Wizards
Hard
The Earliest and Latest Rounds Where Players Compete
Hard
Final Value of Variable After Performing Operations
Easy
Triangle Judgement6 Months
Easy
Maximum Length of a Concatenated String with Unique Characters3 Months
Medium
Minimum Limit of Balls in a Bag
Medium
Add One Row to Tree
Medium
Complement of Base 10 Integer
Easy
Reduce Array Size to The Half
Medium
Find Root of N-Ary Tree
Medium
Self Dividing Numbers
Easy
Maximum Sum of Subsequence With Non-adjacent Elements
Hard
Minimum Sum of Four Digit Number After Splitting Digits
Easy
Largest Perimeter Triangle6 Months
Easy
Prime Palindrome
Medium
Root Equals Sum of Children6 Months
Easy
Concatenated Divisibility
Hard
Seat Reservation Manager
Medium
Movement of Robots
Medium
New 21 Game
Medium
Bitwise AND of Numbers Range
Medium
Maximum Level Sum of a Binary Tree
Medium
Nested List Weight Sum II
Medium
Tuple with Same Product
Medium
Perfect Rectangle
Hard
Construct Binary Tree from Preorder and Postorder Traversal
Medium
Maximum Difference Between Adjacent Elements in a Circular Array
Easy
Product Sales Analysis III
Medium
Find Building Where Alice and Bob Can Meet
Hard
Rank Transform of a Matrix
Hard
Shortest Distance in a Plane
Medium
Additive Number
Medium
To Lower Case
Easy
Fizz Buzz Multithreaded
Medium
Special Positions in a Binary Matrix
Easy
Smallest Subarrays With Maximum Bitwise OR
Medium
Count Number of Balanced Permutations
Hard
Longest Square Streak in an Array
Medium
Longest Palindrome After Substring Concatenation I
Medium
Count Total Number of Colored Cells
Medium
Painting a Grid With Three Different Colors
Hard
Maximum Twin Sum of a Linked List
Medium
Find the Number of Good Pairs II
Medium
Zero Array Transformation II
Medium
Number of Arithmetic Triplets
Easy
Generate Random Point in a Circle
Medium
Determine Whether Matrix Can Be Obtained By Rotation
Easy
Validate Binary Tree Nodes
Medium
Base 7
Easy
Four Divisors6 Months
Medium
Maximum Area of Longest Diagonal Rectangle
Easy
Minimum Consecutive Cards to Pick Up
Medium
Find Unique Binary String
Medium
Stream of Characters
Hard
Maximum 69 Number
Easy
Find Mode in Binary Search Tree
Easy
Find All Groups of Farmland
Medium
Split and Merge Array Transformation
Medium
Count Almost Equal Pairs I
Medium
Longest Subsequence With Limited Sum
Easy
Insertion Sort List6 Months
Medium
Best Time to Buy and Sell Stock V6 Months
Medium
Display the First Three Rows
Easy
Last Day Where You Can Still Cross6 Months
Hard
Minimum Cost Walk in Weighted Graph
Hard
Find the Pivot Integer
Easy
Partition Array into Two Equal Product Subsets
Medium
Smallest Number in Infinite Set
Medium
Find Maximal Uncovered Ranges
Medium
Largest Prime from Consecutive Prime Sum
Medium
Count Number of Trapezoids I
Medium
Apply Operations to Maximize Score
Hard
Find Sum of Array Product of Magical Sequences
Hard
Minimum Adjacent Swaps to Reach the Kth Smallest Number
Medium
Find the Largest Area of Square Inside Two Rectangles3 Months
Medium
Detect Capital
Easy
Length of Longest Fibonacci Subsequence
Medium
Sequential Digits
Medium
Minimum Operations to Make Array Elements Zero
Hard
Sum of k-Mirror Numbers
Hard
Sellers With No Sales
Easy
Maximum Number of Operations to Move Ones to the End6 Months
Medium
Minimum Number of Operations to Make Elements in Array Distinct
Easy
Tenth Line6 Months
Easy
Count of Interesting Subarrays
Medium
Largest Odd Number in String
Easy
Increment Submatrices by One6 Months
Medium
Longest Arithmetic Subsequence of Given Difference
Medium
Maximum Profit from Trading Stocks with Discounts
Hard
Minimum Recolors to Get K Consecutive Black Blocks
Easy
Count Number of Teams
Medium
Maximum Product of Three Elements After One Replacement
Medium
Count Largest Group
Easy
Make Array Elements Equal to Zero6 Months
Easy
Find Kth Bit in Nth Binary String
Medium
Unique Binary Search Trees II
Medium
Second Minimum Node In a Binary Tree
Easy
Range Module
Hard
Partition Array for Maximum Sum
Medium
K-th Symbol in Grammar
Medium
Domino and Tromino Tiling
Medium
Number of Dice Rolls With Target Sum
Medium
Hamming Distance
Easy
Number Complement
Easy
Unique Word Abbreviation
Medium
A Number After a Double Reversal
Easy
Timeout Cancellation
Easy
Minimum Number of Seconds to Make Mountain Height Zero
Medium
Find Closest Person
Easy
Longest Subarray With Maximum Bitwise AND
Medium
Minimum Operations to Make the Integer Zero6 Months
Medium
Implement Magic Dictionary
Medium
Number of Sub-arrays With Odd Sum
Medium
Arithmetic Slices II - Subsequence
Hard
Maximum Score Words Formed by Letters
Hard
Group Sold Products By The Date
Easy
Total Characters in String After Transformations II
Hard
Distribute Candies
Easy
Consecutive Characters
Easy
Apply Transform Over Each Element in Array
Easy
Sum of All Subset XOR Totals
Easy
Take K of Each Character From Left and Right
Medium
Find the K-th Character in String Game I6 Months
Easy
Reach End of Array With Max Score
Medium
Corporate Flight Bookings
Medium
Split a String Into the Max Number of Unique Substrings
Medium
Can Make Arithmetic Progression From Sequence3 Months
Easy
The Two Sneaky Numbers of Digitville
Easy
Zero Array Transformation III
Medium
Knight Dialer
Medium
Clone Binary Tree With Random Pointer
Medium
Construct the Minimum Bitwise Array II30 Days
Medium
Minimum Operations to Make Array Sum Divisible by K
Easy
Minimum Number of Moves to Seat Everyone
Easy
Stone Game III
Hard
Count the Number of Computer Unlocking Permutations6 Months
Medium
Beautiful Array
Medium
Queries Quality and Percentage
Easy
Find Books with No Available Copies6 Months
Easy
Rearrange Products Table
Easy
Minimize Maximum Pair Sum in Array6 Months
Medium
Goat Latin30 Days
Easy
Minimum Number Game
Easy
Number of Senior Citizens
Easy
Shortest Path to Get Food
Medium
Redundant Connection II
Hard
Longest Uncommon Subsequence I
Easy
Even Odd Tree
Medium
Number of Ways to Arrive at Destination
Medium
Friends Of Appropriate Ages3 Months
Medium
Longest Even Odd Subarray With Threshold
Easy
Ways to Express an Integer as Sum of Powers
Medium
Trionic Array II30 Days
Hard
Recover a Tree From Preorder Traversal
Hard
Delete Nodes From Linked List Present in Array6 Months
Medium
Total Distance Traveled
Easy
Number of Zero-Filled Subarrays
Medium
Reshape Data: Pivot
Easy
Make Two Arrays Equal by Reversing Subarrays
Easy
Solving Questions With Brainpower
Medium
Resulting String After Adjacent Removals
Medium
Transformed Array
Easy
Largest Color Value in a Directed Graph
Hard
Find Champion II
Medium
Find the Count of Good Integers
Hard
All Elements in Two Binary Search Trees
Medium
Flatten a Multilevel Doubly Linked List6 Months
Medium
Spiral Matrix IV
Medium
Mice and Cheese
Medium
Sleep
Easy
Count Alternating Subarrays
Medium
Longest Unequal Adjacent Groups Subsequence II
Medium
Find the Power of K-Size Subarrays I
Medium
Length of the Longest Subsequence That Sums to Target
Medium
Maximum Odd Binary Number
Easy
The Score of Students Solving Math Expression
Hard
Minimum Number of Pushes to Type Word II
Medium
Count Number of Trapezoids II3 Months
Hard
Rearrange Array Elements by Sign
Medium
Binary Tree Tilt
Easy
Minimum Operations to Make a Uni-Value Grid
Medium
Count Special Quadruplets
Easy
Minimum Moves to Equal Array Elements
Medium
Count Submatrices With All Ones
Medium
Maximum Vacation Days
Hard
Equal Row and Column Pairs
Medium
Longest Absolute File Path
Medium
Maximum Frequency of an Element After Performing Operations I6 Months
Medium
Smallest Value of the Rearranged Number
Medium
Transform Array to All Equal Elements
Medium
Check if the Sentence Is Pangram6 Months
Easy
Unpopular Books6 Months
Medium
Binary Watch
Easy
Lexicographically Smallest Equivalent String
Medium
Maximum Number of Distinct Elements After Operations
Medium
Final Array State After K Multiplication Operations II
Hard
Palindrome Permutation II
Medium
Sort Items by Groups Respecting Dependencies
Hard
Word Frequency
Medium
Similar String Groups
Hard
Count of Matches in Tournament
Easy
Find Longest Special Substring That Occurs Thrice I
Medium
Maximize the Confusion of an Exam
Medium
Find if Array Can Be Sorted
Medium
Move Pieces to Obtain a String
Medium
Minimum Average Difference
Medium
Finding 3-Digit Even Numbers
Easy
Divide an Array Into Subarrays With Minimum Cost I
Easy
Check If N and Its Double Exist
Easy
Swap Sex of Employees
Easy
Minimum Window Subsequence
Hard
Find the Punishment Number of an Integer
Medium
Count Number of Maximum Bitwise-OR Subsets
Medium
Count Prefix and Suffix Pairs I
Easy
Reschedule Meetings for Maximum Free Time I
Medium
Longest Balanced Substring I30 Days
Medium
Maximum Subarray Sum With Length Divisible by K6 Months
Medium