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Microsoft Master DSA Sheet

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

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Design A Leaderboard
Minimized Maximum of Products Distributed to Any Store
Special Binary String3 Months
Determine if Two Strings Are Close
Minimum Score of a Path Between Two Cities
Valid Parentheses3 Months
Min Stack30 Days
Find Followers Count
Length of Longest V-Shaped Diagonal Segment
Fruits Into Baskets II
Minimize Maximum of Array3 Months
Longest Subarray of 1's After Deleting One Element6 Months
Longest Happy String
Second Highest Salary
Number of People Aware of a Secret6 Months
Second Largest Digit in a String
Furthest Building You Can Reach
Pancake Sorting
Swap For Longest Repeated Character Substring
Triples with Bitwise AND Equal To Zero
Customer Who Visited but Did Not Make Any Transactions3 Months
Smallest Range Covering Elements from K Lists
Invalid Tweets6 Months
Monthly Transactions I6 Months
Convert Sorted List to Binary Search Tree
Delete Characters to Make Fancy String
Maximum Count of Positive Integer and Negative Integer
Minimum Bit Flips to Convert Number
Grumpy Bookstore Owner
Categorize Box According to Criteria
Sort Matrix by Diagonals
Inorder Successor in BST
Jump Game II3 Months
Rotating the Box
Asteroid Collision6 Months
Find the Closest Palindrome6 Months
Walking Robot Simulation
Majority Element II3 Months
Minimum Genetic Mutation6 Months
Reverse Prefix of Word
Design Authentication Manager30 Days
Kth Smallest Element in a Sorted Matrix6 Months
Open the Lock6 Months
Snapshot Array
Validate IP Address
Find the Length of the Longest Common Prefix
Design HashMap30 Days
Permutation Sequence6 Months
String Compression II
Count Number of Ways to Place Houses
Minimum Penalty for a Shop
Meeting Rooms II3 Months
Longest Nice Subarray
User Activity for the Past 30 Days I30 Days
Count Unguarded Cells in the Grid
Shortest Subarray With OR at Least K II
Maximum Subarray Sum with One Deletion
Minimum Value to Get Positive Step by Step Sum30 Days
Best Meeting Point
Longest Substring Of All Vowels in Order
Maximum Fruits Harvested After at Most K Steps
Find a Peak Element II
Special Array II
Tweet Counts Per Frequency
Jump Game III
Non-negative Integers without Consecutive Ones
Reverse Linked List3 Months
Design Tic-Tac-Toe30 Days
Subsequence of Size K With the Largest Even Sum
Minimum Difficulty of a Job Schedule30 Days
Minimum Number of Steps to Make Two Strings Anagram6 Months
Minimum Height Trees
Number of Ways to Divide a Long Corridor
Check If a Word Occurs As a Prefix of Any Word in a Sentence
Minimum Additions to Make Valid String
Alternating Groups II
Subarray Product Less Than K
Word Ladder II
N-Queens II6 Months
Insert Delete GetRandom O(1) - Duplicates allowed
Count Equal and Divisible Pairs in an Array
Special Array I
Find Resultant Array After Removing Anagrams
Vowel Spellchecker6 Months
Zigzag Conversion3 Months
Investments in 20166 Months
Shortest Distance from All Buildings3 Months
Count the Number of Infection Sequences6 Months
Graph Valid Tree
Minimum Deletions to Make String Balanced30 Days
Brick Wall
Course Schedule II30 Days
Top K Frequent Words
Unique Binary Search Trees
Design Skiplist
Letter Case Permutation
Pacific Atlantic Water Flow
Customer Placing the Largest Number of Orders6 Months
Spiral Matrix30 Days
Maximum Number of Balloons
K Inverse Pairs Array
Find Common Characters
Find Closest Number to Zero
Serialize and Deserialize Binary Tree3 Months
Clone Graph3 Months
Diameter of Binary Tree3 Months
Alien Dictionary
Search Suggestions System3 Months
Partition Array Into Two Arrays to Minimize Sum Difference3 Months
Subtract the Product and Sum of Digits of an Integer
Merge Intervals30 Days
Longest Palindromic Substring30 Days
Maximum Number of Non-overlapping Palindrome Substrings30 Days
Transpose Matrix6 Months
Find Minimum Diameter After Merging Two Trees
Minimum Number of Days to Make m Bouquets6 Months
Baseball Game
Next Permutation30 Days
Split Array Largest Sum6 Months
Path Sum III
Subdomain Visit Count
Maximum Distance in Arrays
Remove Sub-Folders from the Filesystem
Binary Number with Alternating Bits
Palindrome Pairs6 Months
Copy List with Random Pointer30 Days
Longest Substring Without Repeating Characters30 Days
Finding Pairs With a Certain Sum
All Nodes Distance K in Binary Tree30 Days
Number of Days Between Two Dates
Pow(x, n)3 Months
Encode and Decode Strings
Design a Stack With Increment Operation6 Months
Managers with at Least 5 Direct Reports6 Months
Verifying an Alien Dictionary
1-bit and 2-bit Characters
Count Subarrays With Score Less Than K
Maximum Product Subarray3 Months
Count Salary Categories
Longest Harmonious Subsequence
The Number of the Smallest Unoccupied Chair
Movie Rating
Minimum Cost to Move Chips to The Same Position
Maximum Sum Circular Subarray
Next Greater Numerically Balanced Number
K Closest Points to Origin
Maximum Number of Words You Can Type6 Months
Optimal Account Balancing
Battleships in a Board30 Days
Longest String Chain6 Months
Shortest Word Distance
Maximize Greatness of an Array
Compare Version Numbers
The Number of Employees Which Report to Each Employee
Find K Closest Elements3 Months
Maximum Depth of Binary Tree6 Months
Climbing Stairs30 Days
Nth Highest Salary6 Months
Trapping Rain Water30 Days
Product of Array Except Self30 Days
Power of Four
Time Based Key-Value Store3 Months
Invalid Transactions
Kth Smallest Element in a BST3 Months
Find Beautiful Indices in the Given Array I6 Months
Minimum Deletions to Make Character Frequencies Unique
Koko Eating Bananas30 Days
Find Numbers with Even Number of Digits
Divide Intervals Into Minimum Number of Groups
Binary Tree Paths
Design Spreadsheet
Faulty Keyboard
Car Pooling6 Months
Substring with Concatenation of All Words
Two Sum IV - Input is a BST3 Months
Generate Parentheses3 Months
Minimum Cost For Tickets
Game of Life6 Months
Minimum Number of K Consecutive Bit Flips
Middle of the Linked List6 Months
Number of Visible People in a Queue6 Months
Find All Anagrams in a String6 Months
Check If It Is a Good Array
Exchange Seats
Find All Numbers Disappeared in an Array3 Months
Number of 1 Bits
Maximum Number of Integers to Choose From a Range I
Longest Word in Dictionary
Longest Increasing Path in a Matrix6 Months
Minimum Number of Food Buckets to Feed the Hamsters
Remove Boxes
Capacity To Ship Packages Within D Days3 Months
Maximum Length Substring With Two Occurrences
Students and Examinations
Convert Binary Number in a Linked List to Integer
Daily Temperatures3 Months
Stock Price Fluctuation
Task Scheduler3 Months
Maximum Palindromes After Operations6 Months
Maximum Width Ramp
Valid Word
Rabbits in Forest
House Robber III
First Unique Number6 Months
Swim in Rising Water3 Months
Max Chunks To Make Sorted
Rotate Image3 Months
Unique Paths II30 Days
My Calendar I3 Months
Minimum Window Substring30 Days
Average Time of Process per Machine6 Months
Minimum Knight Moves6 Months
Minimum Swaps to Group All 1's Together
Wildcard Matching3 Months
Largest Number3 Months
Longest Repeating Character Replacement3 Months
Sqrt(x)6 Months
Remove All Occurrences of a Substring
First Missing Positive6 Months
Maximum Profit in Job Scheduling
Palindrome Partitioning II3 Months
Permutation in String3 Months
IPO
Basic Calculator III6 Months
Count Ways To Build Good Strings3 Months
Valid Sudoku6 Months
Maximum Sum BST in Binary Tree
Design Excel Sum Formula
Merge Two Binary Trees
Divisor Game
Find Winner on a Tic Tac Toe Game6 Months
Find the Prefix Common Array of Two Arrays
Find the Distance Value Between Two Arrays
Count Vowel Strings in Ranges
Random Pick with Weight6 Months
Valid Palindrome II3 Months
Regular Expression Matching3 Months
Count Elements With Maximum Frequency6 Months
Basic Calculator II
Longest Strictly Increasing or Strictly Decreasing Subarray
Sort Even and Odd Indices Independently
Reverse Bits6 Months
Maximum Swap
Minimum Difference Between Highest and Lowest of K Scores
Design Snake Game
Sliding Window Median30 Days
Populating Next Right Pointers in Each Node II
Single Number III
Number of Islands30 Days
Word Search II3 Months
Trapping Rain Water II6 Months
Interval List Intersections
Count Binary Substrings3 Months
Isomorphic Strings6 Months
Find All Possible Recipes from Given Supplies
Longest Common Prefix30 Days
Partition to K Equal Sum Subsets3 Months
Restaurant Growth
Permutations6 Months
Partition Array Into Three Parts With Equal Sum
Linked List Cycle II30 Days
Maximal Square30 Days
Longest Arithmetic Subsequence
Palindromic Substrings3 Months
Bitwise ORs of Subarrays3 Months
Power Grid Maintenance6 Months
All O`one Data Structure
Exclusive Time of Functions
Max Sum of a Pair With Equal Sum of Digits
Find The Original Array of Prefix Xor
Valid Number
Minimum Number of Refueling Stops6 Months
Find the Index of the First Occurrence in a String3 Months
Shortest Bridge6 Months
Snakes and Ladders
Find the Smallest Divisor Given a Threshold
Last Person to Fit in the Bus
Web Crawler
Heaters3 Months
Walls and Gates
Burst Balloons3 Months
Two Sum II - Input Array Is Sorted30 Days
Range Sum Query 2D - Immutable
Pascal's Triangle30 Days
Closest Prime Numbers in Range
Longest Common Subsequence6 Months
LRU Cache30 Days
Binary Tree Cameras3 Months
Insert Interval30 Days
Set Matrix Zeroes3 Months
Bus Routes
Design In-Memory File System6 Months
Angle Between Hands of a Clock
Remove K Digits
Two Sum30 Days
Reaching Points
Count and Say
Minimum Cost Path with Edge Reversals6 Months
Rotting Oranges3 Months
String Compression
Minimum Adjacent Swaps for K Consecutive Ones
Design an ATM Machine
LFU Cache30 Days
Broken Calculator6 Months
Move Zeroes30 Days
Single Element in a Sorted Array3 Months
Excel Sheet Column Number3 Months
Search a 2D Matrix II6 Months
Course Schedule30 Days
Minimum Number of Operations to Make Array Continuous
Basic Calculator6 Months
Restore IP Addresses3 Months
Rank Teams by Votes
Maximum Value at a Given Index in a Bounded Array
Maximum Number of Vowels in a Substring of Given Length
Non-overlapping Intervals
Ways to Make a Fair Array
Search in Rotated Sorted Array3 Months
Valid Perfect Square6 Months
Add Binary6 Months
Logger Rate Limiter
Backspace String Compare
Making A Large Island6 Months
Minimize Maximum Component Cost
Robot Bounded In Circle6 Months
Maximum Sum of Distinct Subarrays With Length K
Successful Pairs of Spells and Potions6 Months
Max Points on a Line
Lemonade Change
Design Circular Queue3 Months
Insert Delete GetRandom O(1)3 Months
Longest Valid Parentheses3 Months
Merge Sorted Array30 Days
Fair Candy Swap
Container With Most Water30 Days
Roman to Integer3 Months
Frog Jump
Minimum Edge Reversals So Every Node Is Reachable30 Days
Shortest Path in Binary Matrix6 Months
Combination Sum6 Months
Minimum Sideway Jumps
Product of the Last K Numbers
Find the Minimum Area to Cover All Ones II
Reverse Words in a String30 Days
Height Checker
Guess the Word
Minimum Time to Collect All Apples in a Tree
Divide Nodes Into the Maximum Number of Groups
Kth Largest Element in a Stream
Minimum Increment to Make Array Unique
Minimum Absolute Difference Between Elements With Constraint
Maximum Subarray30 Days
Word Ladder30 Days
The Skyline Problem
Decode String3 Months
Distribute Coins in Binary Tree
Contains Duplicate3 Months
Path With Minimum Effort6 Months
Squares of a Sorted Array3 Months
Edit Distance6 Months
Department Highest Salary
Minimize the Maximum Difference of Pairs
Cherry Pickup
Count Vowel Substrings of a String
Count the Number of Inversions
Serialize and Deserialize BST
Maximum Ascending Subarray Sum
Find the Minimum Area to Cover All Ones I
Rectangle Overlap
Count Subarrays With Fixed Bounds6 Months
Loud and Rich
Count Square Submatrices with All Ones
As Far from Land as Possible
Alice and Bob Playing Flower Game
Intersection of Two Linked Lists
Shuffle an Array
Rotate Array3 Months
Minimum Remove to Make Valid Parentheses
Largest Rectangle in Histogram3 Months
Multiply Strings6 Months
Count Unreachable Pairs of Nodes in an Undirected Graph
Delete Duplicate Folders in System
Leaf-Similar Trees
Minimum Substring Partition of Equal Character Frequency
Reorder List3 Months
Palindrome Permutation
Merge k Sorted Lists30 Days
Simplify Path3 Months
Encode and Decode TinyURL
Immediate Food Delivery II
Median of Two Sorted Arrays30 Days
Concatenation of Array3 Months
Binary Search Tree to Greater Sum Tree
Max Consecutive Ones III
Moving Average from Data Stream
Regions Cut By Slashes
Flood Fill30 Days
Replace Words
3Sum Closest3 Months
Number of Recent Calls
Number of Digit One
Delete Node in a BST6 Months
Maximal Rectangle3 Months
Reconstruct Itinerary
Last Substring in Lexicographical Order30 Days
Integer to Roman3 Months
Implement Stack using Queues30 Days
Remove All Adjacent Duplicates in String II3 Months
Image Smoother
Online Stock Span3 Months
Sum of Nodes with Even-Valued Grandparent
Design Hit Counter6 Months
Island Perimeter
Recyclable and Low Fat Products3 Months
Sum of Square Numbers
Critical Connections in a Network3 Months
Subsets II3 Months
Find All Duplicates in an Array6 Months
Find Duplicate File in System
Remove Zero Sum Consecutive Nodes from Linked List
Course Schedule IV
N-Queens30 Days
Symmetric Tree30 Days
The Maze
Valid Palindrome30 Days
Majority Element30 Days
Remove Invalid Parentheses
Palindrome Partitioning6 Months
Reverse String3 Months
Valid Anagram30 Days
Permutations II6 Months
Merge Two Sorted Lists3 Months
Shortest Common Supersequence3 Months
Palindrome Number30 Days
Average Selling Price6 Months
Construct K Palindrome Strings
Add Two Numbers30 Days
Diagonal Traverse3 Months
Greatest Common Divisor of Strings
Rectangle Area
Pairs of Songs With Total Durations Divisible by 60
Minimum Path Sum6 Months
Subarrays with K Different Integers3 Months
Word Pattern II
Longest Substring with At Most K Distinct Characters6 Months
Decode Ways6 Months
Top K Frequent Elements3 Months
Maximum Score From Removing Substrings
Combine Two Tables30 Days
Best Time to Buy and Sell Stock30 Days
Remove Linked List Elements3 Months
Sum of Two Integers3 Months
Count Days Without Meetings
Gas Station6 Months
Number of Students Unable to Eat Lunch
Find the Town Judge
Minimum Absolute Difference30 Days
Minimum Suffix Flips
Lowest Common Ancestor of a Binary Tree6 Months
All Paths From Source to Target
Validate Stack Sequences
Sort Colors30 Days
Convert Binary Search Tree to Sorted Doubly Linked List
Uncrossed Lines
Fibonacci Number3 Months
Word Break II
Binary Tree Maximum Path Sum3 Months
Consecutive Numbers
Make Sum Divisible by P
Word Search6 Months
Check If Array Pairs Are Divisible by k
Super Egg Drop
Employee Importance
Same Tree30 Days
Binary Tree Right Side View3 Months
Letter Combinations of a Phone Number30 Days
Triangle6 Months
Shortest Palindrome
Subarray Sum Equals K30 Days
Minimum Operations to Make Binary Array Elements Equal to One I3 Months
Reverse Nodes in k-Group3 Months
Reverse Words in a String II
Group Anagrams30 Days
Minimum Score Triangulation of Polygon6 Months
Construct Binary Tree from Inorder and Postorder Traversal
Trips and Users
Contiguous Array
Partition Equal Subset Sum6 Months
3Sum30 Days
Find the Duplicate Number6 Months
Evaluate Division6 Months
Delete Nodes And Return Forest
Design Add and Search Words Data Structure6 Months
Dungeon Game
Find Duplicate Subtrees
Add to Array-Form of Integer
Find the City With the Smallest Number of Neighbors at a Threshold Distance
Network Delay Time6 Months
Sum of Subarray Minimums
Jump Game6 Months
Advantage Shuffle
Find Minimum Time to Finish All Jobs6 Months
Divide Array Into Arrays With Max Difference
Shortest Path with Alternating Colors
Implement Trie (Prefix Tree)6 Months
Longest Substring with At Most Two Distinct Characters
Best Time to Buy and Sell Stock II6 Months
Final Prices With a Special Discount in a Shop3 Months
Minimum Sum of Squared Difference
Minimum Cuts to Divide a Circle
Maximum Number of Occurrences of a Substring
Design Linked List3 Months
Length of Last Word3 Months
Coin Change3 Months
Fruit Into Baskets
Find the Highest Altitude
Department Top Three Salaries6 Months
Reduction Operations to Make the Array Elements Equal
Replace Non-Coprime Numbers in Array
N-th Tribonacci Number
Find the Winner of an Array Game
Balanced Binary Tree
Largest Positive Integer That Exists With Its Negative
Continuous Subarray Sum
Minimum Time Difference
Sum Root to Leaf Numbers
Matrix Diagonal Sum
Path Sum II6 Months
Remove Element30 Days
Kth Largest Element in an Array30 Days
Stone Game IV
Distance to a Cycle in Undirected Graph
Defanging an IP Address6 Months
Minimum Common Value
Design Bounded Blocking Queue
Minimum Moves to Equal Array Elements II
Remove Duplicates From an Unsorted Linked List
Minimum Cost to Make Array Equal
Rotate String3 Months
Perfect Squares6 Months
Distinct Subsequences6 Months
Print Words Vertically
Word Subsets
Number of Ways to Split Array
Arranging Coins
Ugly Number II
Add Digits
Minimum Number of Operations to Make X and Y Equal
Validate Binary Search Tree6 Months
Minimum Cost to Equalize Array
Largest Time for Given Digits
4 Keys Keyboard
Longest Nice Substring6 Months
Reverse Linked List II3 Months
Next Greater Element III6 Months
Delete Duplicate Emails6 Months
Minimum Number of Arrows to Burst Balloons
Reverse Substrings Between Each Pair of Parentheses
Maximum Number of Potholes That Can Be Fixed
Next Greater Node In Linked List
Maximum Population Year
Combination Sum II3 Months
Print in Order
Candy3 Months
Reverse Pairs
Best Time to Buy and Sell Stock III6 Months
Optimal Partition of String
Count Number of Nice Subarrays
Function Composition
Reverse Words in a String III
Sort List6 Months
Create a DataFrame from List
Number of Closed Islands
Shortest Unsorted Continuous Subarray
Minimum Rectangles to Cover Points
Populating Next Right Pointers in Each Node6 Months
The Knight’s Tour
Plus One3 Months
Find the Winner of the Circular Game
Meeting Rooms III
Power of Two6 Months
Can Place Flowers
Intersection of Two Arrays II6 Months
Search in Rotated Sorted Array II
Long Pressed Name3 Months
First Unique Character in a String3 Months
Maximal Network Rank6 Months
Duplicate Emails
Count Submatrices With Equal Frequency of X and Y
Convert Sorted Array to Binary Search Tree6 Months
Add Strings6 Months
Count Good Nodes in Binary Tree
Add Two Integers30 Days
Find Median from Data Stream3 Months
Divide Array Into Equal Pairs
Employee Bonus30 Days
Insert into a Binary Search Tree6 Months
Reorder Routes to Make All Paths Lead to the City Zero
Max Consecutive Ones30 Days
Find Center of Star Graph
Longest Consecutive Sequence3 Months
Reverse Vowels of a String6 Months
Boundary of Binary Tree3 Months
Minimum Number of Swaps to Make the String Balanced3 Months
Divide Two Integers6 Months
Maximum Points You Can Obtain from Cards3 Months
Happy Number3 Months
Remove All Adjacent Duplicates In String
Integer to English Words30 Days
Find Minimum in Rotated Sorted Array3 Months
Sudoku Solver
Minimum Size Subarray Sum6 Months
Merge Strings Alternately30 Days
Word Break6 Months
Time Needed to Buy Tickets
Water Bottles
Replace All ?'s to Avoid Consecutive Repeating Characters
Last Stone Weight
String to Integer (atoi)3 Months
Check if Array Is Sorted and Rotated3 Months
Combinations
Reorganize String3 Months
Sliding Window Maximum3 Months
Find K Pairs with Smallest Sums6 Months
Next Greater Element I30 Days
Vertical Order Traversal of a Binary Tree
Minimum Amount of Time to Collect Garbage
Contains Duplicate II3 Months
Remove Duplicate Letters3 Months
4Sum3 Months
Project Employees I3 Months
Single Number II
Count Pairs Whose Sum is Less than Target
Maximum Product of Three Numbers
Nearest Exit from Entrance in Maze
Best Time to Buy and Sell Stock with Cooldown
Prefix and Suffix Search
Longest Increasing Subsequence3 Months
Product Sales Analysis I
Implement Queue using Stacks6 Months
Car Fleet6 Months
Count Odd Numbers in an Interval Range
Is Graph Bipartite?6 Months
Interleaving String3 Months
3Sum Smaller
Sort Array by Increasing Frequency
Bulb Switcher II
Count Good Numbers30 Days
Max Area of Island
Find the Start and End Number of Continuous Ranges
The k-th Lexicographical String of All Happy Strings of Length n
Count Nodes Equal to Average of Subtree
Coin Change II
Count the Number of Good Subarrays
Largest Substring Between Two Equal Characters
Find Lucky Integer in an Array
Ugly Number
Find First and Last Position of Element in Sorted Array3 Months
Find Bottom Left Tree Value
Minimum Operations to Reduce an Integer to 030 Days
Palindrome Linked List3 Months
Binary Tree Zigzag Level Order Traversal30 Days
Minimum Moves to Spread Stones Over Grid
Digit Operations to Make Two Integers Equal
Maximum Product of Splitted Binary Tree
Previous Permutation With One Swap
K-diff Pairs in an Array
Summary Ranges
Number of Times Binary String Is Prefix-Aligned
Remove Digit From Number to Maximize Result
Delete the Middle Node of a Linked List
Tallest Billboard
House Robber II
Remove Duplicates from Sorted Array30 Days
Minimum Flips to Make a OR b Equal to c
How Many Numbers Are Smaller Than the Current Number3 Months
Maximum Number of Intersections on the Chart
Lowest Common Ancestor of a Binary Search Tree6 Months
Find Missing Observations
Assign Cookies3 Months
Rising Temperature3 Months
Word Pattern
Add Bold Tag in String
Cheapest Flights Within K Stops3 Months
Add Two Numbers II
Best Time to Buy and Sell Stock using Strategy
Sum of Digits of String After Convert
Delete and Earn6 Months
Remove Nth Node From End of List3 Months
Find Peak Element3 Months
Is Subsequence6 Months
Minimum Falling Path Sum
Allow One Function Call
Degree of an Array
Kill Process
Jewels and Stones
Subsets30 Days
Sort Characters By Frequency30 Days
Range Sum of BST
Strong Password Checker
Number of Good Pairs3 Months
Number of Substrings Containing All Three Characters
Design Memory Allocator6 Months
Maximum Number of Operations With the Same Score II
Sum of Beauty of All Substrings
Split Array With Same Average6 Months
Sort an Array
Keys and Rooms6 Months
Minimum Number of Moves to Make Palindrome
Best Time to Buy and Sell Stock IV
Cousins in Binary Tree
Count Servers that Communicate6 Months
Shuffle the Array6 Months
Search Insert Position6 Months
Sliding Puzzle6 Months
Maximum Number of Events That Can Be Attended30 Days
Decrypt String from Alphabet to Integer Mapping3 Months
Next Greater Element II6 Months
Widest Vertical Area Between Two Points Containing No Points
01 Matrix
Text Justification3 Months
Odd Even Linked List3 Months
Missing Number6 Months
Minimum Time to Make Rope Colorful
Patching Array
Unique Paths
Intersection of Two Arrays6 Months
Target Sum3 Months
Fraction to Recurring Decimal
Min Cost to Connect All Points6 Months
Delete Node in a Linked List
Flatten Binary Tree to Linked List6 Months
Number of Distinct Islands3 Months
House Robber6 Months
Find Triangular Sum of an Array
Longest Path With Different Adjacent Characters
Detonate the Maximum Bombs6 Months
Consecutive Numbers Sum6 Months
Cinema Seat Allocation
Number of Atoms
Spiral Matrix II
Design File System
Number of Longest Increasing Subsequence
Numbers At Most N Given Digit Set
Find Missing and Repeated Values
Water and Jug Problem
Path with Maximum Gold
Divide Players Into Teams of Equal Skill
Design Browser History
Longest Palindromic Subsequence3 Months
Find N Unique Integers Sum up to Zero
Rotated Digits
Longest Mountain in Array
Article Views I3 Months
132 Pattern
Excel Sheet Column Title30 Days
Find the Longest Substring Containing Vowels in Even Counts
Dot Product of Two Sparse Vectors
Reverse Integer30 Days
Tree Diameter6 Months
Champagne Tower6 Months
Fizz Buzz3 Months
Minimum Fuel Cost to Report to the Capital
Count Mentions Per User6 Months
Smallest String With Swaps6 Months
All Possible Full Binary Trees
Unique Paths III
Reverse Only Letters
Find Customer Referee
Minimum Number of Removals to Make Mountain Array
Largest Palindromic Number
Number of Unique Flavors After Sharing K Candies
Best Time to Buy and Sell Stock with Transaction Fee
Maximum Length of Repeated Subarray
Number of Provinces3 Months
Maximum Manhattan Distance After K Changes
Most Stones Removed with Same Row or Column3 Months
Binary Tree Level Order Traversal30 Days
Reordered Power of 26 Months
Range Sum Query - Immutable
Lowest Common Ancestor of a Binary Tree II
Stable Subarrays With Equal Boundary and Interior Sum
Make the Prefix Sum Non-negative
Find the Minimum and Maximum Number of Nodes Between Critical Points
Maximum Difference Between Even and Odd Frequency II
Sum of Subarray Ranges
Minimum Number of Taps to Open to Water a Garden3 Months
Find the Difference
Not Boring Movies
2 Keys Keyboard
Binary Search3 Months
Construct Binary Search Tree from Preorder Traversal6 Months
Unique Number of Occurrences6 Months
Custom Sort String
Three Divisors
Partition Labels
Minimum Deletions to Make Array Beautiful
Greatest English Letter in Upper and Lower Case
Number of Enclaves
Pascal's Triangle II6 Months
Grid Game
Maximum Matrix Sum
Number of Distinct Binary Strings After Applying Operations
Peak Index in a Mountain Array
Percentage of Users Attended a Contest
Game Play Analysis IV
Single Number6 Months
Maximum Unique Subarray Sum After Deletion
Remove Outermost Parentheses
Boats to Save People30 Days
Amount of Time for Binary Tree to Be Infected3 Months
Minimum Cost to Cut a Stick6 Months
Design a Text Editor6 Months
Lexicographically Minimum String After Removing Stars
Counter3 Months
Maximum Difference Between Even and Odd Frequency I
Longest Substring with At Least K Repeating Characters6 Months
Binary Tree Vertical Order Traversal
Richest Customer Wealth6 Months
Return Length of Arguments Passed
Clumsy Factorial
Surrounded Regions
Search in a Binary Search Tree
Maximum Subgraph Score in a Tree
Remove Comments3 Months
Binary Tree Inorder Traversal6 Months
Remove Duplicates from Sorted List
Parsing A Boolean Expression
Separate Black and White Balls
Max Number of K-Sum Pairs
Swap Nodes in Pairs6 Months
Closest Binary Search Tree Value
Statistics from a Large Sample
Meeting Rooms
Repeated Substring Pattern
Customers Who Never Order
Minimum Operations to Make Array Equal to Target3 Months
Get the Second Most Recent Activity
Construct Binary Tree from Preorder and Inorder Traversal6 Months
Minimum Number of Increments on Subarrays to Form a Target Array
Find Words Containing Character6 Months
Third Maximum Number
Find the Level of Tree with Minimum Sum
Flatten Nested List Iterator
Maximum Width of Binary Tree30 Days
Count of Smaller Numbers After Self3 Months
Repeated DNA Sequences
Binary Search Tree Iterator
Find the Maximum Length of Valid Subsequence II
Partition List
Increasing Triplet Subsequence6 Months
Find the Lexicographically Largest String From the Box I
24 Game
Max Dot Product of Two Subsequences
Power of Three
Reformat The String
Product Price at a Given Date
Create Hello World Function3 Months
Count Number of Pairs With Absolute Difference K
Lexicographical Numbers
Recover Binary Search Tree3 Months
Shortest Subarray with Sum at Least K
Count the Number of Substrings With Dominant Ones
Number of Ways to Split a String
Delete Tree Nodes
Count Hills and Valleys in an Array
Find the Median of the Uniqueness Array
Minimum Difference in Sums After Removal of Elements
Maximum Average Subarray I6 Months
Repeated String Match
Invert Binary Tree
Maximum Score Of Spliced Array
Bitwise OR of Even Numbers in an Array
Running Sum of 1d Array6 Months
Sign of the Product of an Array
Kids With the Greatest Number of Candies
Russian Doll Envelopes
Minimum Cost to Separate Sentence Into Rows
Contains Duplicate III
Valid Mountain Array
Swapping Nodes in a Linked List
Max Pair Sum in an Array
Find the Maximum Achievable Number
Single-Threaded CPU
Min Cost Climbing Stairs
Meeting Scheduler
Number of Steps to Reduce a Number in Binary Representation to One
Smallest Number With Given Digit Product
Shifting Letters6 Months
Find Eventual Safe States
Replace Employee ID With The Unique Identifier6 Months
Different Ways to Add Parentheses
Maximum Nesting Depth of the Parentheses
Find in Mountain Array
Letter Tile Possibilities
Path Sum6 Months
Friend Requests II: Who Has the Most Friends
Sum of Left Leaves
Maximum Binary Tree
Put Marbles in Bags
To Be Or Not To Be
Maximize Number of Nice Divisors
Find All The Lonely Nodes
Perfect Number6 Months
Shortest Subarray to be Removed to Make Array Sorted
Minimum Operations to Halve Array Sum
K-th Smallest in Lexicographical Order
Minimum Incompatibility
Maximum OR6 Months
Redundant Connection
Maximum Gap
All the Matches of the League
Count the Number of Fair Pairs
Delete N Nodes After M Nodes of a Linked List
Remove Duplicates from Sorted Array II
Wiggle Sort II30 Days
Smallest Integer Divisible by K6 Months
Maximum Price to Fill a Bag
Memoize
Arithmetic Slices
Minimum Add to Make Parentheses Valid
Shuffle String
Employees Earning More Than Their Managers
Primary Department for Each Employee
Cherry Pickup II
Nim Game
Confirmation Rate
Count Palindromic Subsequences
Evaluate Reverse Polish Notation6 Months
Longest Balanced Substring II6 Months
Score of a String
Sum of Distances in Tree
Get the Maximum Score6 Months
Maximum Candies Allocated to K Children
Longest Palindrome3 Months
Find the Original Typed String I
Count the Number of Special Characters II
Widest Pair of Indices With Equal Range Sum
Find the Celebrity
Balance a Binary Search Tree30 Days
Linked List Cycle3 Months
Search a 2D Matrix3 Months
The Number of Full Rounds You Have Played
Smallest Missing Integer Greater Than Sequential Prefix Sum
Type of Triangle
Strange Printer
Find Pivot Index
Maximum Size of a Set After Removals
Super Pow
Find the Difference of Two Arrays
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Hand of Straights
Calculate Money in Leetcode Bank6 Months
Equal Rational Numbers
Big Countries3 Months
Possible Bipartition
Count Substrings That Differ by One Character
Valid Parenthesis String6 Months
Maximum Subtree of the Same Color
Construct String With Repeat Limit
Matchsticks to Square
Convert Integer to the Sum of Two No-Zero Integers6 Months
Count Negative Numbers in a Sorted Matrix6 Months
Minimize Malware Spread6 Months
Lowest Common Ancestor of a Binary Tree III
Minimum Pair Removal to Sort Array I30 Days
Count Primes
Maximum Number That Sum of the Prices Is Less Than or Equal to K
Paint House6 Months
Element Appearing More Than 25% In Sorted Array
Predict the Winner
Factorial Trailing Zeroes
Maximum Frequency Stack
Design Search Autocomplete System
Remove Duplicates from Sorted List II
Magnetic Force Between Two Balls
Number of Steps to Reduce a Number to Zero
Merge Two 2D Arrays by Summing Values
Valid Tic-Tac-Toe State6 Months
Counter II
Tag Validator
Find Smallest Common Element in All Rows
Kth Missing Positive Number6 Months
Robot Room Cleaner6 Months
Most Profit Assigning Work
Spiral Matrix III
Two Best Non-Overlapping Events
Merge In Between Linked Lists
Integer Break
Average Height of Buildings in Each Segment
Implement Rand10() Using Rand7()
Palindrome Removal
Merge Nodes in Between Zeros
Binary Tree Level Order Traversal II
Guess Number Higher or Lower6 Months
Subtree of Another Tree6 Months
Maximum of Absolute Value Expression
Split Linked List in Parts
Maximum Size Subarray Sum Equals k
Create Maximum Number
Find if Path Exists in Graph30 Days
String Compression III
Count Paths With the Given XOR Value
Subarray Sums Divisible by K3 Months
H-Index6 Months
Minimum Number of Changes to Make Binary String Beautiful
Game Play Analysis I
Minimum Depth of Binary Tree3 Months
Rank Scores3 Months
Path with Maximum Probability
First Bad Version
Largest Divisible Subset
Nth Digit
Largest BST Subtree
Number of Operations to Make Network Connected
Accounts Merge6 Months
Binary Tree Preorder Traversal
Kth Smallest Product of Two Sorted Arrays
Unique Length-3 Palindromic Subsequences6 Months
Maximum Number of Events That Can Be Attended II
Continuous Subarrays
Classes With at Least 5 Students6 Months
Maximum Subsequence Score
Minesweeper3 Months
Frequency of the Most Frequent Element6 Months
Minimum Sensors to Cover Grid
Counting Bits
Bulb Switcher
Ransom Note6 Months
Binary Subarrays With Sum6 Months
Keyboard Row
Serialize and Deserialize N-ary Tree
Buildings With an Ocean View
Valid Triangle Number6 Months
Maximum Average Pass Ratio
House Robber IV3 Months
Minimum Number of Operations to Move All Balls to Each Box
Employee Free Time3 Months
Maximum Number of Alloys
Partition Array According to Given Pivot
Design Twitter3 Months
Maximum Employees to Be Invited to a Meeting
Set Mismatch
Rearranging Fruits
Maximum Number of Operations With the Same Score I
Count Complete Tree Nodes
Minimum Swaps to Group All 1's Together II
Rotate List3 Months
The kth Factor of n
Check if All A's Appears Before All B's
Minimum Swaps To Make Sequences Increasing
Day of the Week
Spiral Matrix IV
The K Weakest Rows in a Matrix
Maximum Absolute Sum of Any Subarray
Binary Tree Postorder Traversal
Find Largest Value in Each Tree Row
Rearrange Array Elements by Sign
Find the Minimum Amount of Time to Brew Potions
Sort Vowels in a String
Egg Drop With 2 Eggs and N Floors
Build Array from Permutation
Count Routes to Climb a Rectangular Grid3 Months
Reformat Department Table
GCD of Odd and Even Sums3 Months
Convert 1D Array Into 2D Array
Fix Names in a Table
Find X-Sum of All K-Long Subarrays I
Sort Array By Parity II
Convert the Temperature
Select Data6 Months
Maximum Sum of 3 Non-Overlapping Subarrays
XOR Queries of a Subarray
List the Products Ordered in a Period
Final Array State After K Multiplication Operations I
Count Partitions With Max-Min Difference at Most K
Longest Ideal Subsequence6 Months
Smallest Divisible Digit Product II
Longest Palindrome by Concatenating Two Letter Words
Second Minimum Time to Reach Destination
Mirror Reflection
Minimum Score After Removals on a Tree
Maximum Erasure Value
Delete Leaves With a Given Value
Reverse String II6 Months
Frog Jump II
Minimum Time to Repair Cars6 Months
Flatten a Multilevel Doubly Linked List6 Months
Find Minimum in Rotated Sorted Array II
Find the Original Typed String II
Longest ZigZag Path in a Binary Tree
Paths in Matrix Whose Sum Is Divisible by K6 Months
Valid Boomerang
Binary Tree Pruning
Count Residue Prefixes3 Months
Count Subarrays Where Max Element Appears at Least K Times
Design a Food Rating System
Count Unique Characters of All Substrings of a Given String
Set Intersection Size At Least Two6 Months
Greatest Sum Divisible by Three3 Months
Actors and Directors Who Cooperated At Least Three Times
Count Number of Texts
Number of Employees Who Met the Target
Longest Happy Prefix6 Months
Count Subarrays of Length Three With a Condition
Maximize Happiness of Selected Children3 Months
Construct the Lexicographically Largest Valid Sequence
Clear Digits
Find the Maximum Length of Valid Subsequence I
Count the Number of Ideal Arrays
Check If Digits Are Equal in String After Operations I
Frequency Tracker
Shortest Distance After Road Addition Queries I
Read N Characters Given Read4
Twisted Mirror Path Count6 Months
Minimum Operations to Make a Subsequence
Minimum Pair Removal to Sort Array II6 Months
Stone Game
Adjacent Increasing Subarrays Detection I
The Two Sneaky Numbers of Digitville6 Months
Number of Subsequences That Satisfy the Given Sum Condition
Last Stone Weight II
Minimum Operations to Make Array Sum Divisible by K
Convert BST to Greater Tree
Average of Levels in Binary Tree
Minimum Index of a Valid Split
Insert Greatest Common Divisors in Linked List
Patients With a Condition
Count Partitions with Even Sum Difference
Array Partition
Elimination Game
Circular Array Loop
String Matching in an Array
Time Needed to Inform All Employees
Find Right Interval
Minimum Operations to Make Array Values Equal to K
Maximum Number of K-Divisible Components
Minimum Cost to Convert String I
Count the Number of Complete Components
Check If a String Contains All Binary Codes of Size K
Coloring A Border
Car Fleet II30 Days
Rearrange Words in a Sentence6 Months
Reach a Number
Bag of Tokens
Number of Ways to Paint N × 3 Grid
Maximum Sum With at Most K Elements
Reducing Dishes
Append Characters to String to Make Subsequence
Maximum Number of Fish in a Grid
Number of Smooth Descent Periods of a Stock6 Months
Range Sum Query - Mutable
Check Knight Tour Configuration
Number of Sub-arrays With Odd Sum
Combination Sum III
Generate Binary Strings Without Adjacent Zeros
Seat Reservation Manager
Cells with Odd Values in a Matrix
N-ary Tree Level Order Traversal
Delete Operation for Two Strings
The Dining Philosophers
Design Task Manager6 Months
Number of Spaces Cleaning Robot Cleaned
The Latest Time to Catch a Bus
Count Collisions of Monkeys on a Polygon
Transform Array to All Equal Elements
Build an Array With Stack Operations6 Months
Smallest Missing Non-negative Integer After Operations
Find K-th Smallest Pair Distance
Arithmetic Slices II - Subsequence
Minimum Average of Smallest and Largest Elements
K-Concatenation Maximum Sum
Distinct Prime Factors of Product of Array
Fruits Into Baskets III
Maximum Level Sum of a Binary Tree3 Months
Merge BSTs to Create Single BST
Minimize XOR
Maximum Total Importance of Roads
Flip Columns For Maximum Number of Equal Rows
Sum of k-Mirror Numbers
Maximum Frequency After Subarray Operation
Robot Return to Origin
Sorting the Sentence6 Months
Count Symmetric Integers
Longest Turbulent Subarray
Minimum Sum of Mountain Triplets I
Goat Latin
Largest Odd Number in String6 Months
Hamming Distance
Largest Multiple of Three
Number of Ways to Arrive at Destination
Corporate Flight Bookings
Partition Array for Maximum Sum
Magical String
Beautiful Array
Make Array Elements Equal to Zero
Make Two Arrays Equal by Reversing Subarrays
Maximum Difference Between Adjacent Elements in a Circular Array
Construct Binary Tree from Preorder and Postorder Traversal
Insertion Sort List
Bitwise AND of Numbers Range
Minimum Cost Walk in Weighted Graph
Smallest Value of the Rearranged Number
Minimum Increments to Equalize Leaf Paths6 Months
Get Equal Substrings Within Budget
Divide an Array Into Subarrays With Minimum Cost I30 Days
Recover a Tree From Preorder Traversal
Construct the Longest New String
Prime Subtraction Operation
Painting a Grid With Three Different Colors
Friends Of Appropriate Ages
Cousins in Binary Tree II
Row With Maximum Ones
Maximum Value of an Ordered Triplet II
Partition Array into Disjoint Intervals
Binary Watch3 Months
Swap Sex of Employees
Flip Equivalent Binary Trees
Largest Component Size by Common Factor3 Months
Maximum Odd Binary Number
Ways to Express an Integer as Sum of Powers
Check if the Sentence Is Pangram6 Months
Search in a Sorted Array of Unknown Size
Shortest Distance to a Character
Magic Squares In Grid
Circle and Rectangle Overlapping
Cat and Mouse
Find if Array Can Be Sorted
Total Cost to Hire K Workers
Construct the Minimum Bitwise Array I
Count Number of Maximum Bitwise-OR Subsets
Maximum Length of a Concatenated String with Unique Characters
Maximize Subarrays After Removing One Conflicting Pair
Duplicate Zeros
Final Value of Variable After Performing Operations
Super Ugly Number6 Months
Four Divisors3 Months
Reschedule Meetings for Maximum Free Time II
Check if Object Instance of Class
Number of Increasing Paths in a Grid
Minimum Initial Energy to Finish Tasks6 Months
Most Common Word
Determine Whether Matrix Can Be Obtained By Rotation
Can Make Arithmetic Progression From Sequence3 Months
Zero Array Transformation I
Chunk Array
Number of Segments in a String
Count Non-Decreasing Subarrays After K Operations
Minimum Swaps to Make Strings Equal
Maximum Twin Sum of a Linked List
Minimum Total Distance Traveled
Construct the Minimum Bitwise Array II6 Months
Count Number of Bad Pairs
Super Palindromes
Check Completeness of a Binary Tree
Total Hamming Distance
Word Frequency
Find Longest Special Substring That Occurs Thrice I
Special Array With X Elements Greater Than or Equal X
Number of Zero-Filled Subarrays
Maximum Capacity Within Budget3 Months
Finding 3-Digit Even Numbers
Reveal Cards In Increasing Order
Find Smallest Letter Greater Than Target
Check If N and Its Double Exist
Numbers With Repeated Digits
Harshad Number
Minimum Domino Rotations For Equal Row
Shortest Path Visiting All Nodes
Removing Stars From a String
Binary Prefix Divisible By 5
Gray Code
Push Dominoes
Sum of All Subset XOR Totals
Count Special Quadruplets
Implement Trie II (Prefix Tree)
Knight Dialer
Minimum Number of Moves to Seat Everyone
Kth Largest Sum in a Binary Tree
Minimum Number of Vertices to Reach All Nodes
Minimum Time Visiting All Points
Array Reduce Transformation
Move Pieces to Obtain a String
Queries Quality and Percentage
Smallest Palindromic Rearrangement I
Maximum Energy Boost From Two Drinks
Array Prototype Last
Trionic Array II
Minimum Cost to Hire K Workers
Delete Nodes From Linked List Present in Array
Minimum Operations to Make a Uni-Value Grid
To Lower Case
Maximum Number of Points with Cost
Minimum Time to Visit a Cell In a Grid
Solving Questions With Brainpower
Count the Number of Incremovable Subarrays I
Jump Game VI
Find the K-th Character in String Game I
Longest Subarray With Maximum Bitwise AND
Smallest Good Base
Split a String Into the Max Number of Unique Substrings
Sort Array By Parity
Zero Array Transformation III
K-th Symbol in Grammar
Number of Squareful Arrays
Tuple with Same Product
Product Sales Analysis III6 Months
Count of Interesting Subarrays
Binary Searchable Numbers in an Unsorted Array3 Months
Find Kth Bit in Nth Binary String
Unique Binary Search Trees II
Minimum Number of Operations to Make Elements in Array Distinct
Maximum XOR of Two Numbers in an Array
Implement Router
Double a Number Represented as a Linked List
Counting Words With a Given Prefix
Minimum Moves to Equal Array Elements
Domino and Tromino Tiling
Defuse the Bomb
Number Complement
Transformed Array
Smallest Number With All Set Bits6 Months
Count of Substrings Containing Every Vowel and K Consonants II
Smallest Number in Infinite Set
Find the Largest Area of Square Inside Two Rectangles3 Months
Detect Capital
Length of Longest Fibonacci Subsequence
Remove Nodes From Linked List
Calculator with Method Chaining6 Months
Maximum Number of Words Found in Sentences
Smallest Subarrays With Maximum Bitwise OR
Equal Row and Column Pairs
Queens That Can Attack the King
Longest Square Streak in an Array
Count Total Number of Colored Cells
Count of Matches in Tournament
Inorder Successor in BST II
Validate Binary Tree Nodes
Base 7
Add Two Promises
Adding Spaces to a String
Minimum Jumps to Reach Home
Find Unique Binary String
Maximum 69 Number
Root Equals Sum of Children
Triangle Judgement
Rank Transform of an Array
Minimum Limit of Balls in a Bag
Add One Row to Tree
Check if One String Swap Can Make Strings Equal
Largest Combination With Bitwise AND Greater Than Zero
New 21 Game