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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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1352
Design A Leaderboard
Medium
Minimized Maximum of Products Distributed to Any Store
Medium
Special Binary String3 Months
Hard
Determine if Two Strings Are Close
Medium
Minimum Score of a Path Between Two Cities
Medium
Valid Parentheses3 Months
Easy
Min Stack30 Days
Medium
Find Followers Count
Easy
Length of Longest V-Shaped Diagonal Segment
Hard
Fruits Into Baskets II
Easy
Minimize Maximum of Array3 Months
Medium
Longest Subarray of 1's After Deleting One Element6 Months
Medium
Longest Happy String
Medium
Second Highest Salary
Medium
Number of People Aware of a Secret6 Months
Medium
Second Largest Digit in a String
Easy
Furthest Building You Can Reach
Medium
Pancake Sorting
Medium
Swap For Longest Repeated Character Substring
Medium
Triples with Bitwise AND Equal To Zero
Hard
Customer Who Visited but Did Not Make Any Transactions3 Months
Easy
Smallest Range Covering Elements from K Lists
Hard
Invalid Tweets6 Months
Easy
Monthly Transactions I6 Months
Medium
Convert Sorted List to Binary Search Tree
Medium
Delete Characters to Make Fancy String
Easy
Maximum Count of Positive Integer and Negative Integer
Easy
Minimum Bit Flips to Convert Number
Easy
Grumpy Bookstore Owner
Medium
Categorize Box According to Criteria
Easy
Sort Matrix by Diagonals
Medium
Inorder Successor in BST
Medium
Jump Game II3 Months
Medium
Rotating the Box
Medium
Asteroid Collision6 Months
Medium
Find the Closest Palindrome6 Months
Hard
Walking Robot Simulation
Medium
Majority Element II3 Months
Medium
Minimum Genetic Mutation6 Months
Medium
Reverse Prefix of Word
Easy
Design Authentication Manager30 Days
Medium
Kth Smallest Element in a Sorted Matrix6 Months
Medium
Open the Lock6 Months
Medium
Snapshot Array
Medium
Validate IP Address
Medium
Find the Length of the Longest Common Prefix
Medium
Design HashMap30 Days
Easy
Permutation Sequence6 Months
Hard
String Compression II
Hard
Count Number of Ways to Place Houses
Medium
Minimum Penalty for a Shop
Medium
Meeting Rooms II3 Months
Medium
Longest Nice Subarray
Medium
User Activity for the Past 30 Days I30 Days
Easy
Count Unguarded Cells in the Grid
Medium
Shortest Subarray With OR at Least K II
Medium
Maximum Subarray Sum with One Deletion
Medium
Minimum Value to Get Positive Step by Step Sum30 Days
Easy
Best Meeting Point
Hard
Longest Substring Of All Vowels in Order
Medium
Maximum Fruits Harvested After at Most K Steps
Hard
Find a Peak Element II
Medium
Special Array II
Medium
Tweet Counts Per Frequency
Medium
Jump Game III
Medium
Non-negative Integers without Consecutive Ones
Hard
Reverse Linked List3 Months
Easy
Design Tic-Tac-Toe30 Days
Medium
Subsequence of Size K With the Largest Even Sum
Medium
Minimum Difficulty of a Job Schedule30 Days
Hard
Minimum Number of Steps to Make Two Strings Anagram6 Months
Medium
Minimum Height Trees
Medium
Number of Ways to Divide a Long Corridor
Hard
Check If a Word Occurs As a Prefix of Any Word in a Sentence
Easy
Minimum Additions to Make Valid String
Medium
Alternating Groups II
Medium
Subarray Product Less Than K
Medium
Word Ladder II
Hard
N-Queens II6 Months
Hard
Insert Delete GetRandom O(1) - Duplicates allowed
Hard
Count Equal and Divisible Pairs in an Array
Easy
Special Array I
Easy
Find Resultant Array After Removing Anagrams
Easy
Vowel Spellchecker6 Months
Medium
Zigzag Conversion3 Months
Medium
Investments in 20166 Months
Medium
Shortest Distance from All Buildings3 Months
Hard
Count the Number of Infection Sequences6 Months
Hard
Graph Valid Tree
Medium
Minimum Deletions to Make String Balanced30 Days
Medium
Brick Wall
Medium
Course Schedule II30 Days
Medium
Top K Frequent Words
Medium
Unique Binary Search Trees
Medium
Design Skiplist
Hard
Letter Case Permutation
Medium
Pacific Atlantic Water Flow
Medium
Customer Placing the Largest Number of Orders6 Months
Easy
Spiral Matrix30 Days
Medium
Maximum Number of Balloons
Easy
K Inverse Pairs Array
Hard
Find Common Characters
Easy
Find Closest Number to Zero
Easy
Serialize and Deserialize Binary Tree3 Months
Hard
Clone Graph3 Months
Medium
Diameter of Binary Tree3 Months
Easy
Alien Dictionary
Hard
Search Suggestions System3 Months
Medium
Partition Array Into Two Arrays to Minimize Sum Difference3 Months
Hard
Subtract the Product and Sum of Digits of an Integer
Easy
Merge Intervals30 Days
Medium
Longest Palindromic Substring30 Days
Medium
Maximum Number of Non-overlapping Palindrome Substrings30 Days
Hard
Transpose Matrix6 Months
Easy
Find Minimum Diameter After Merging Two Trees
Hard
Minimum Number of Days to Make m Bouquets6 Months
Medium
Baseball Game
Easy
Next Permutation30 Days
Medium
Split Array Largest Sum6 Months
Hard
Path Sum III
Medium
Subdomain Visit Count
Medium
Maximum Distance in Arrays
Medium
Remove Sub-Folders from the Filesystem
Medium
Binary Number with Alternating Bits
Easy
Palindrome Pairs6 Months
Hard
Copy List with Random Pointer30 Days
Medium
Longest Substring Without Repeating Characters30 Days
Medium
Finding Pairs With a Certain Sum
Medium
All Nodes Distance K in Binary Tree30 Days
Medium
Number of Days Between Two Dates
Easy
Pow(x, n)3 Months
Medium
Encode and Decode Strings
Medium
Design a Stack With Increment Operation6 Months
Medium
Managers with at Least 5 Direct Reports6 Months
Medium
Verifying an Alien Dictionary
Easy
1-bit and 2-bit Characters
Easy
Count Subarrays With Score Less Than K
Hard
Maximum Product Subarray3 Months
Medium
Count Salary Categories
Medium
Longest Harmonious Subsequence
Easy
The Number of the Smallest Unoccupied Chair
Medium
Movie Rating
Medium
Minimum Cost to Move Chips to The Same Position
Easy
Maximum Sum Circular Subarray
Medium
Next Greater Numerically Balanced Number
Medium
K Closest Points to Origin
Medium
Maximum Number of Words You Can Type6 Months
Easy
Optimal Account Balancing
Hard
Battleships in a Board30 Days
Medium
Longest String Chain6 Months
Medium
Shortest Word Distance
Easy
Maximize Greatness of an Array
Medium
Compare Version Numbers
Medium
The Number of Employees Which Report to Each Employee
Easy
Find K Closest Elements3 Months
Medium
Maximum Depth of Binary Tree6 Months
Easy
Climbing Stairs30 Days
Easy
Nth Highest Salary6 Months
Medium
Trapping Rain Water30 Days
Hard
Product of Array Except Self30 Days
Medium
Power of Four
Easy
Time Based Key-Value Store3 Months
Medium
Invalid Transactions
Medium
Kth Smallest Element in a BST3 Months
Medium
Find Beautiful Indices in the Given Array I6 Months
Medium
Minimum Deletions to Make Character Frequencies Unique
Medium
Koko Eating Bananas30 Days
Medium
Find Numbers with Even Number of Digits
Easy
Divide Intervals Into Minimum Number of Groups
Medium
Binary Tree Paths
Easy
Design Spreadsheet
Medium
Faulty Keyboard
Easy
Car Pooling6 Months
Medium
Substring with Concatenation of All Words
Hard
Two Sum IV - Input is a BST3 Months
Easy
Generate Parentheses3 Months
Medium
Minimum Cost For Tickets
Medium
Game of Life6 Months
Medium
Minimum Number of K Consecutive Bit Flips
Hard
Middle of the Linked List6 Months
Easy
Number of Visible People in a Queue6 Months
Hard
Find All Anagrams in a String6 Months
Medium
Check If It Is a Good Array
Hard
Exchange Seats
Medium
Find All Numbers Disappeared in an Array3 Months
Easy
Number of 1 Bits
Easy
Maximum Number of Integers to Choose From a Range I
Medium
Longest Word in Dictionary
Medium
Longest Increasing Path in a Matrix6 Months
Hard
Minimum Number of Food Buckets to Feed the Hamsters
Medium
Remove Boxes
Hard
Capacity To Ship Packages Within D Days3 Months
Medium
Maximum Length Substring With Two Occurrences
Easy
Students and Examinations
Easy
Convert Binary Number in a Linked List to Integer
Easy
Daily Temperatures3 Months
Medium
Stock Price Fluctuation
Medium
Task Scheduler3 Months
Medium
Maximum Palindromes After Operations6 Months
Medium
Maximum Width Ramp
Medium
Valid Word
Easy
Rabbits in Forest
Medium
House Robber III
Medium
First Unique Number6 Months
Medium
Swim in Rising Water3 Months
Hard
Max Chunks To Make Sorted
Medium
Rotate Image3 Months
Medium
Unique Paths II30 Days
Medium
My Calendar I3 Months
Medium
Minimum Window Substring30 Days
Hard
Average Time of Process per Machine6 Months
Easy
Minimum Knight Moves6 Months
Medium
Minimum Swaps to Group All 1's Together
Medium
Wildcard Matching3 Months
Hard
Largest Number3 Months
Medium
Longest Repeating Character Replacement3 Months
Medium
Sqrt(x)6 Months
Easy
Remove All Occurrences of a Substring
Medium
First Missing Positive6 Months
Hard
Maximum Profit in Job Scheduling
Hard
Palindrome Partitioning II3 Months
Hard
Permutation in String3 Months
Medium
IPO
Hard
Basic Calculator III6 Months
Hard
Count Ways To Build Good Strings3 Months
Medium
Valid Sudoku6 Months
Medium
Maximum Sum BST in Binary Tree
Hard
Design Excel Sum Formula
Hard
Merge Two Binary Trees
Easy
Divisor Game
Easy
Find Winner on a Tic Tac Toe Game6 Months
Easy
Find the Prefix Common Array of Two Arrays
Medium
Find the Distance Value Between Two Arrays
Easy
Count Vowel Strings in Ranges
Medium
Random Pick with Weight6 Months
Medium
Valid Palindrome II3 Months
Easy
Regular Expression Matching3 Months
Hard
Count Elements With Maximum Frequency6 Months
Easy
Basic Calculator II
Medium
Longest Strictly Increasing or Strictly Decreasing Subarray
Easy
Sort Even and Odd Indices Independently
Easy
Reverse Bits6 Months
Easy
Maximum Swap
Medium
Minimum Difference Between Highest and Lowest of K Scores
Easy
Design Snake Game
Medium
Sliding Window Median30 Days
Hard
Populating Next Right Pointers in Each Node II
Medium
Single Number III
Medium
Number of Islands30 Days
Medium
Word Search II3 Months
Hard
Trapping Rain Water II6 Months
Hard
Interval List Intersections
Medium
Count Binary Substrings3 Months
Easy
Isomorphic Strings6 Months
Easy
Find All Possible Recipes from Given Supplies
Medium
Longest Common Prefix30 Days
Easy
Partition to K Equal Sum Subsets3 Months
Medium
Restaurant Growth
Medium
Permutations6 Months
Medium
Partition Array Into Three Parts With Equal Sum
Easy
Linked List Cycle II30 Days
Medium
Maximal Square30 Days
Medium
Longest Arithmetic Subsequence
Medium
Palindromic Substrings3 Months
Medium
Bitwise ORs of Subarrays3 Months
Medium
Power Grid Maintenance6 Months
Medium
All O`one Data Structure
Hard
Exclusive Time of Functions
Medium
Max Sum of a Pair With Equal Sum of Digits
Medium
Find The Original Array of Prefix Xor
Medium
Valid Number
Hard
Minimum Number of Refueling Stops6 Months
Hard
Find the Index of the First Occurrence in a String3 Months
Easy
Shortest Bridge6 Months
Medium
Snakes and Ladders
Medium
Find the Smallest Divisor Given a Threshold
Medium
Last Person to Fit in the Bus
Medium
Web Crawler
Medium
Heaters3 Months
Medium
Walls and Gates
Medium
Burst Balloons3 Months
Hard
Two Sum II - Input Array Is Sorted30 Days
Medium
Range Sum Query 2D - Immutable
Medium
Pascal's Triangle30 Days
Easy
Closest Prime Numbers in Range
Medium
Longest Common Subsequence6 Months
Medium
LRU Cache30 Days
Medium
Binary Tree Cameras3 Months
Hard
Insert Interval30 Days
Medium
Set Matrix Zeroes3 Months
Medium
Bus Routes
Hard
Design In-Memory File System6 Months
Hard
Angle Between Hands of a Clock
Medium
Remove K Digits
Medium
Two Sum30 Days
Easy
Reaching Points
Hard
Count and Say
Medium
Minimum Cost Path with Edge Reversals6 Months
Medium
Rotting Oranges3 Months
Medium
String Compression
Medium
Minimum Adjacent Swaps for K Consecutive Ones
Hard
Design an ATM Machine
Medium
LFU Cache30 Days
Hard
Broken Calculator6 Months
Medium
Move Zeroes30 Days
Easy
Single Element in a Sorted Array3 Months
Medium
Excel Sheet Column Number3 Months
Easy
Search a 2D Matrix II6 Months
Medium
Course Schedule30 Days
Medium
Minimum Number of Operations to Make Array Continuous
Hard
Basic Calculator6 Months
Hard
Restore IP Addresses3 Months
Medium
Rank Teams by Votes
Medium
Maximum Value at a Given Index in a Bounded Array
Medium
Maximum Number of Vowels in a Substring of Given Length
Medium
Non-overlapping Intervals
Medium
Ways to Make a Fair Array
Medium
Search in Rotated Sorted Array3 Months
Medium
Valid Perfect Square6 Months
Easy
Add Binary6 Months
Easy
Logger Rate Limiter
Easy
Backspace String Compare
Easy
Making A Large Island6 Months
Hard
Minimize Maximum Component Cost
Medium
Robot Bounded In Circle6 Months
Medium
Maximum Sum of Distinct Subarrays With Length K
Medium
Successful Pairs of Spells and Potions6 Months
Medium
Max Points on a Line
Hard
Lemonade Change
Easy
Design Circular Queue3 Months
Medium
Insert Delete GetRandom O(1)3 Months
Medium
Longest Valid Parentheses3 Months
Hard
Merge Sorted Array30 Days
Easy
Fair Candy Swap
Easy
Container With Most Water30 Days
Medium
Roman to Integer3 Months
Easy
Frog Jump
Hard
Minimum Edge Reversals So Every Node Is Reachable30 Days
Hard
Shortest Path in Binary Matrix6 Months
Medium
Combination Sum6 Months
Medium
Minimum Sideway Jumps
Medium
Product of the Last K Numbers
Medium
Find the Minimum Area to Cover All Ones II
Hard
Reverse Words in a String30 Days
Medium
Height Checker
Easy
Guess the Word
Hard
Minimum Time to Collect All Apples in a Tree
Medium
Divide Nodes Into the Maximum Number of Groups
Hard
Kth Largest Element in a Stream
Easy
Minimum Increment to Make Array Unique
Medium
Minimum Absolute Difference Between Elements With Constraint
Medium
Maximum Subarray30 Days
Medium
Word Ladder30 Days
Hard
The Skyline Problem
Hard
Decode String3 Months
Medium
Distribute Coins in Binary Tree
Medium
Contains Duplicate3 Months
Easy
Path With Minimum Effort6 Months
Medium
Squares of a Sorted Array3 Months
Easy
Edit Distance6 Months
Medium
Department Highest Salary
Medium
Minimize the Maximum Difference of Pairs
Medium
Cherry Pickup
Hard
Count Vowel Substrings of a String
Easy
Count the Number of Inversions
Hard
Serialize and Deserialize BST
Medium
Maximum Ascending Subarray Sum
Easy
Find the Minimum Area to Cover All Ones I
Medium
Rectangle Overlap
Easy
Count Subarrays With Fixed Bounds6 Months
Hard
Loud and Rich
Medium
Count Square Submatrices with All Ones
Medium
As Far from Land as Possible
Medium
Alice and Bob Playing Flower Game
Medium
Intersection of Two Linked Lists
Easy
Shuffle an Array
Medium
Rotate Array3 Months
Medium
Minimum Remove to Make Valid Parentheses
Medium
Largest Rectangle in Histogram3 Months
Hard
Multiply Strings6 Months
Medium
Count Unreachable Pairs of Nodes in an Undirected Graph
Medium
Delete Duplicate Folders in System
Hard
Leaf-Similar Trees
Easy
Minimum Substring Partition of Equal Character Frequency
Medium
Reorder List3 Months
Medium
Palindrome Permutation
Easy
Merge k Sorted Lists30 Days
Hard
Simplify Path3 Months
Medium
Encode and Decode TinyURL
Medium
Immediate Food Delivery II
Medium
Median of Two Sorted Arrays30 Days
Hard
Concatenation of Array3 Months
Easy
Binary Search Tree to Greater Sum Tree
Medium
Max Consecutive Ones III
Medium
Moving Average from Data Stream
Easy
Regions Cut By Slashes
Medium
Flood Fill30 Days
Easy
Replace Words
Medium
3Sum Closest3 Months
Medium
Number of Recent Calls
Easy
Number of Digit One
Hard
Delete Node in a BST6 Months
Medium
Maximal Rectangle3 Months
Hard
Reconstruct Itinerary
Hard
Last Substring in Lexicographical Order30 Days
Hard
Integer to Roman3 Months
Medium
Implement Stack using Queues30 Days
Easy
Remove All Adjacent Duplicates in String II3 Months
Medium
Image Smoother
Easy
Online Stock Span3 Months
Medium
Sum of Nodes with Even-Valued Grandparent
Medium
Design Hit Counter6 Months
Medium
Island Perimeter
Easy
Recyclable and Low Fat Products3 Months
Easy
Sum of Square Numbers
Medium
Critical Connections in a Network3 Months
Hard
Subsets II3 Months
Medium
Find All Duplicates in an Array6 Months
Medium
Find Duplicate File in System
Medium
Remove Zero Sum Consecutive Nodes from Linked List
Medium
Course Schedule IV
Medium
N-Queens30 Days
Hard
Symmetric Tree30 Days
Easy
The Maze
Medium
Valid Palindrome30 Days
Easy
Majority Element30 Days
Easy
Remove Invalid Parentheses
Hard
Palindrome Partitioning6 Months
Medium
Reverse String3 Months
Easy
Valid Anagram30 Days
Easy
Permutations II6 Months
Medium
Merge Two Sorted Lists3 Months
Easy
Shortest Common Supersequence3 Months
Hard
Palindrome Number30 Days
Easy
Average Selling Price6 Months
Easy
Construct K Palindrome Strings
Medium
Add Two Numbers30 Days
Medium
Diagonal Traverse3 Months
Medium
Greatest Common Divisor of Strings
Easy
Rectangle Area
Medium
Pairs of Songs With Total Durations Divisible by 60
Medium
Minimum Path Sum6 Months
Medium
Subarrays with K Different Integers3 Months
Hard
Word Pattern II
Medium
Longest Substring with At Most K Distinct Characters6 Months
Medium
Decode Ways6 Months
Medium
Top K Frequent Elements3 Months
Medium
Maximum Score From Removing Substrings
Medium
Combine Two Tables30 Days
Easy
Best Time to Buy and Sell Stock30 Days
Easy
Remove Linked List Elements3 Months
Easy
Sum of Two Integers3 Months
Medium
Count Days Without Meetings
Medium
Gas Station6 Months
Medium
Number of Students Unable to Eat Lunch
Easy
Find the Town Judge
Easy
Minimum Absolute Difference30 Days
Easy
Minimum Suffix Flips
Medium
Lowest Common Ancestor of a Binary Tree6 Months
Medium
All Paths From Source to Target
Medium
Validate Stack Sequences
Medium
Sort Colors30 Days
Medium
Convert Binary Search Tree to Sorted Doubly Linked List
Medium
Uncrossed Lines
Medium
Fibonacci Number3 Months
Easy
Word Break II
Hard
Binary Tree Maximum Path Sum3 Months
Hard
Consecutive Numbers
Medium
Make Sum Divisible by P
Medium
Word Search6 Months
Medium
Check If Array Pairs Are Divisible by k
Medium
Super Egg Drop
Hard
Employee Importance
Medium
Same Tree30 Days
Easy
Binary Tree Right Side View3 Months
Medium
Letter Combinations of a Phone Number30 Days
Medium
Triangle6 Months
Medium
Shortest Palindrome
Hard
Subarray Sum Equals K30 Days
Medium
Minimum Operations to Make Binary Array Elements Equal to One I3 Months
Medium
Reverse Nodes in k-Group3 Months
Hard
Reverse Words in a String II
Medium
Group Anagrams30 Days
Medium
Minimum Score Triangulation of Polygon6 Months
Medium
Construct Binary Tree from Inorder and Postorder Traversal
Medium
Trips and Users
Hard
Contiguous Array
Medium
Partition Equal Subset Sum6 Months
Medium
3Sum30 Days
Medium
Find the Duplicate Number6 Months
Medium
Evaluate Division6 Months
Medium
Delete Nodes And Return Forest
Medium
Design Add and Search Words Data Structure6 Months
Medium
Dungeon Game
Hard
Find Duplicate Subtrees
Medium
Add to Array-Form of Integer
Easy
Find the City With the Smallest Number of Neighbors at a Threshold Distance
Medium
Network Delay Time6 Months
Medium
Sum of Subarray Minimums
Medium
Jump Game6 Months
Medium
Advantage Shuffle
Medium
Find Minimum Time to Finish All Jobs6 Months
Hard
Divide Array Into Arrays With Max Difference
Medium
Shortest Path with Alternating Colors
Medium
Implement Trie (Prefix Tree)6 Months
Medium
Longest Substring with At Most Two Distinct Characters
Medium
Best Time to Buy and Sell Stock II6 Months
Medium
Final Prices With a Special Discount in a Shop3 Months
Easy
Minimum Sum of Squared Difference
Medium
Minimum Cuts to Divide a Circle
Easy
Maximum Number of Occurrences of a Substring
Medium
Design Linked List3 Months
Medium
Length of Last Word3 Months
Easy
Coin Change3 Months
Medium
Fruit Into Baskets
Medium
Find the Highest Altitude
Easy
Department Top Three Salaries6 Months
Hard
Reduction Operations to Make the Array Elements Equal
Medium
Replace Non-Coprime Numbers in Array
Hard
N-th Tribonacci Number
Easy
Find the Winner of an Array Game
Medium
Balanced Binary Tree
Easy
Largest Positive Integer That Exists With Its Negative
Easy
Continuous Subarray Sum
Medium
Minimum Time Difference
Medium
Sum Root to Leaf Numbers
Medium
Matrix Diagonal Sum
Easy
Path Sum II6 Months
Medium
Remove Element30 Days
Easy
Kth Largest Element in an Array30 Days
Medium
Stone Game IV
Hard
Distance to a Cycle in Undirected Graph
Hard
Defanging an IP Address6 Months
Easy
Minimum Common Value
Easy
Design Bounded Blocking Queue
Medium
Minimum Moves to Equal Array Elements II
Medium
Remove Duplicates From an Unsorted Linked List
Medium
Minimum Cost to Make Array Equal
Hard
Rotate String3 Months
Easy
Perfect Squares6 Months
Medium
Distinct Subsequences6 Months
Hard
Print Words Vertically
Medium
Word Subsets
Medium
Number of Ways to Split Array
Medium
Arranging Coins
Easy
Ugly Number II
Medium
Add Digits
Easy
Minimum Number of Operations to Make X and Y Equal
Medium
Validate Binary Search Tree6 Months
Medium
Minimum Cost to Equalize Array
Hard
Largest Time for Given Digits
Medium
4 Keys Keyboard
Medium
Longest Nice Substring6 Months
Easy
Reverse Linked List II3 Months
Medium
Next Greater Element III6 Months
Medium
Delete Duplicate Emails6 Months
Easy
Minimum Number of Arrows to Burst Balloons
Medium
Reverse Substrings Between Each Pair of Parentheses
Medium
Maximum Number of Potholes That Can Be Fixed
Medium
Next Greater Node In Linked List
Medium
Maximum Population Year
Easy
Combination Sum II3 Months
Medium
Print in Order
Easy
Candy3 Months
Hard
Reverse Pairs
Hard
Best Time to Buy and Sell Stock III6 Months
Hard
Optimal Partition of String
Medium
Count Number of Nice Subarrays
Medium
Function Composition
Easy
Reverse Words in a String III
Easy
Sort List6 Months
Medium
Create a DataFrame from List
Easy
Number of Closed Islands
Medium
Shortest Unsorted Continuous Subarray
Medium
Minimum Rectangles to Cover Points
Medium
Populating Next Right Pointers in Each Node6 Months
Medium
The Knight’s Tour
Medium
Plus One3 Months
Easy
Find the Winner of the Circular Game
Medium
Meeting Rooms III
Hard
Power of Two6 Months
Easy
Can Place Flowers
Easy
Intersection of Two Arrays II6 Months
Easy
Search in Rotated Sorted Array II
Medium
Long Pressed Name3 Months
Easy
First Unique Character in a String3 Months
Easy
Maximal Network Rank6 Months
Medium
Duplicate Emails
Easy
Count Submatrices With Equal Frequency of X and Y
Medium
Convert Sorted Array to Binary Search Tree6 Months
Easy
Add Strings6 Months
Easy
Count Good Nodes in Binary Tree
Medium
Add Two Integers30 Days
Easy
Find Median from Data Stream3 Months
Hard
Divide Array Into Equal Pairs
Easy
Employee Bonus30 Days
Easy
Insert into a Binary Search Tree6 Months
Medium
Reorder Routes to Make All Paths Lead to the City Zero
Medium
Max Consecutive Ones30 Days
Easy
Find Center of Star Graph
Easy
Longest Consecutive Sequence3 Months
Medium
Reverse Vowels of a String6 Months
Easy
Boundary of Binary Tree3 Months
Medium
Minimum Number of Swaps to Make the String Balanced3 Months
Medium
Divide Two Integers6 Months
Medium
Maximum Points You Can Obtain from Cards3 Months
Medium
Happy Number3 Months
Easy
Remove All Adjacent Duplicates In String
Easy
Integer to English Words30 Days
Hard
Find Minimum in Rotated Sorted Array3 Months
Medium
Sudoku Solver
Hard
Minimum Size Subarray Sum6 Months
Medium
Merge Strings Alternately30 Days
Easy
Word Break6 Months
Medium
Time Needed to Buy Tickets
Easy
Water Bottles
Easy
Replace All ?'s to Avoid Consecutive Repeating Characters
Easy
Last Stone Weight
Easy
String to Integer (atoi)3 Months
Medium
Check if Array Is Sorted and Rotated3 Months
Easy
Combinations
Medium
Reorganize String3 Months
Medium
Sliding Window Maximum3 Months
Hard
Find K Pairs with Smallest Sums6 Months
Medium
Next Greater Element I30 Days
Easy
Vertical Order Traversal of a Binary Tree
Hard
Minimum Amount of Time to Collect Garbage
Medium
Contains Duplicate II3 Months
Easy
Remove Duplicate Letters3 Months
Medium
4Sum3 Months
Medium
Project Employees I3 Months
Easy
Single Number II
Medium
Count Pairs Whose Sum is Less than Target
Easy
Maximum Product of Three Numbers
Easy
Nearest Exit from Entrance in Maze
Medium
Best Time to Buy and Sell Stock with Cooldown
Medium
Prefix and Suffix Search
Hard
Longest Increasing Subsequence3 Months
Medium
Product Sales Analysis I
Easy
Implement Queue using Stacks6 Months
Easy
Car Fleet6 Months
Medium
Count Odd Numbers in an Interval Range
Easy
Is Graph Bipartite?6 Months
Medium
Interleaving String3 Months
Medium
3Sum Smaller
Medium
Sort Array by Increasing Frequency
Easy
Bulb Switcher II
Medium
Count Good Numbers30 Days
Medium
Max Area of Island
Medium
Find the Start and End Number of Continuous Ranges
Medium
The k-th Lexicographical String of All Happy Strings of Length n
Medium
Count Nodes Equal to Average of Subtree
Medium
Coin Change II
Medium
Count the Number of Good Subarrays
Medium
Largest Substring Between Two Equal Characters
Easy
Find Lucky Integer in an Array
Easy
Ugly Number
Easy
Find First and Last Position of Element in Sorted Array3 Months
Medium
Find Bottom Left Tree Value
Medium
Minimum Operations to Reduce an Integer to 030 Days
Medium
Palindrome Linked List3 Months
Easy
Binary Tree Zigzag Level Order Traversal30 Days
Medium
Minimum Moves to Spread Stones Over Grid
Medium
Digit Operations to Make Two Integers Equal
Medium
Maximum Product of Splitted Binary Tree
Medium
Previous Permutation With One Swap
Medium
K-diff Pairs in an Array
Medium
Summary Ranges
Easy
Number of Times Binary String Is Prefix-Aligned
Medium
Remove Digit From Number to Maximize Result
Easy
Delete the Middle Node of a Linked List
Medium
Tallest Billboard
Hard
House Robber II
Medium
Remove Duplicates from Sorted Array30 Days
Easy
Minimum Flips to Make a OR b Equal to c
Medium
How Many Numbers Are Smaller Than the Current Number3 Months
Easy
Maximum Number of Intersections on the Chart
Hard
Lowest Common Ancestor of a Binary Search Tree6 Months
Medium
Find Missing Observations
Medium
Assign Cookies3 Months
Easy
Rising Temperature3 Months
Easy
Word Pattern
Easy
Add Bold Tag in String
Medium
Cheapest Flights Within K Stops3 Months
Medium
Add Two Numbers II
Medium
Best Time to Buy and Sell Stock using Strategy
Medium
Sum of Digits of String After Convert
Easy
Delete and Earn6 Months
Medium
Remove Nth Node From End of List3 Months
Medium
Find Peak Element3 Months
Medium
Is Subsequence6 Months
Easy
Minimum Falling Path Sum
Medium
Allow One Function Call
Easy
Degree of an Array
Easy
Kill Process
Medium
Jewels and Stones
Easy
Subsets30 Days
Medium
Sort Characters By Frequency30 Days
Medium
Range Sum of BST
Easy
Strong Password Checker
Hard
Number of Good Pairs3 Months
Easy
Number of Substrings Containing All Three Characters
Medium
Design Memory Allocator6 Months
Medium
Maximum Number of Operations With the Same Score II
Medium
Sum of Beauty of All Substrings
Medium
Split Array With Same Average6 Months
Hard
Sort an Array
Medium
Keys and Rooms6 Months
Medium
Minimum Number of Moves to Make Palindrome
Hard
Best Time to Buy and Sell Stock IV
Hard
Cousins in Binary Tree
Easy
Count Servers that Communicate6 Months
Medium
Shuffle the Array6 Months
Easy
Search Insert Position6 Months
Easy
Sliding Puzzle6 Months
Hard
Maximum Number of Events That Can Be Attended30 Days
Medium
Decrypt String from Alphabet to Integer Mapping3 Months
Easy
Next Greater Element II6 Months
Medium
Widest Vertical Area Between Two Points Containing No Points
Easy
01 Matrix
Medium
Text Justification3 Months
Hard
Odd Even Linked List3 Months
Medium
Missing Number6 Months
Easy
Minimum Time to Make Rope Colorful
Medium
Patching Array
Hard
Unique Paths
Medium
Intersection of Two Arrays6 Months
Easy
Target Sum3 Months
Medium
Fraction to Recurring Decimal
Medium
Min Cost to Connect All Points6 Months
Medium
Delete Node in a Linked List
Medium
Flatten Binary Tree to Linked List6 Months
Medium
Number of Distinct Islands3 Months
Medium
House Robber6 Months
Medium
Find Triangular Sum of an Array
Medium
Longest Path With Different Adjacent Characters
Hard
Detonate the Maximum Bombs6 Months
Medium
Consecutive Numbers Sum6 Months
Hard
Cinema Seat Allocation
Medium
Number of Atoms
Hard
Spiral Matrix II
Medium
Design File System
Medium
Number of Longest Increasing Subsequence
Medium
Numbers At Most N Given Digit Set
Hard
Find Missing and Repeated Values
Easy
Water and Jug Problem
Medium
Path with Maximum Gold
Medium
Divide Players Into Teams of Equal Skill
Medium
Design Browser History
Medium
Longest Palindromic Subsequence3 Months
Medium
Find N Unique Integers Sum up to Zero
Easy
Rotated Digits
Medium
Longest Mountain in Array
Medium
Article Views I3 Months
Easy
132 Pattern
Medium
Excel Sheet Column Title30 Days
Easy
Find the Longest Substring Containing Vowels in Even Counts
Medium
Dot Product of Two Sparse Vectors
Medium
Reverse Integer30 Days
Medium
Tree Diameter6 Months
Medium
Champagne Tower6 Months
Medium
Fizz Buzz3 Months
Easy
Minimum Fuel Cost to Report to the Capital
Medium
Count Mentions Per User6 Months
Medium
Smallest String With Swaps6 Months
Medium
All Possible Full Binary Trees
Medium
Unique Paths III
Hard
Reverse Only Letters
Easy
Find Customer Referee
Easy
Minimum Number of Removals to Make Mountain Array
Hard
Largest Palindromic Number
Medium
Number of Unique Flavors After Sharing K Candies
Medium
Best Time to Buy and Sell Stock with Transaction Fee
Medium
Maximum Length of Repeated Subarray
Medium
Number of Provinces3 Months
Medium
Maximum Manhattan Distance After K Changes
Medium
Most Stones Removed with Same Row or Column3 Months
Medium
Binary Tree Level Order Traversal30 Days
Medium
Reordered Power of 26 Months
Medium
Range Sum Query - Immutable
Easy
Lowest Common Ancestor of a Binary Tree II
Medium
Stable Subarrays With Equal Boundary and Interior Sum
Medium
Make the Prefix Sum Non-negative
Medium
Find the Minimum and Maximum Number of Nodes Between Critical Points
Medium
Maximum Difference Between Even and Odd Frequency II
Hard
Sum of Subarray Ranges
Medium
Minimum Number of Taps to Open to Water a Garden3 Months
Hard
Find the Difference
Easy
Not Boring Movies
Easy
2 Keys Keyboard
Medium
Binary Search3 Months
Easy
Construct Binary Search Tree from Preorder Traversal6 Months
Medium
Unique Number of Occurrences6 Months
Easy
Custom Sort String
Medium
Three Divisors
Easy
Partition Labels
Medium
Minimum Deletions to Make Array Beautiful
Medium
Greatest English Letter in Upper and Lower Case
Easy
Number of Enclaves
Medium
Pascal's Triangle II6 Months
Easy
Grid Game
Medium
Maximum Matrix Sum
Medium
Number of Distinct Binary Strings After Applying Operations
Medium
Peak Index in a Mountain Array
Medium
Percentage of Users Attended a Contest
Easy
Game Play Analysis IV
Medium
Single Number6 Months
Easy
Maximum Unique Subarray Sum After Deletion
Easy
Remove Outermost Parentheses
Easy
Boats to Save People30 Days
Medium
Amount of Time for Binary Tree to Be Infected3 Months
Medium
Minimum Cost to Cut a Stick6 Months
Hard
Design a Text Editor6 Months
Hard
Lexicographically Minimum String After Removing Stars
Medium
Counter3 Months
Easy
Maximum Difference Between Even and Odd Frequency I
Easy
Longest Substring with At Least K Repeating Characters6 Months
Medium
Binary Tree Vertical Order Traversal
Medium
Richest Customer Wealth6 Months
Easy
Return Length of Arguments Passed
Easy
Clumsy Factorial
Medium
Surrounded Regions
Medium
Search in a Binary Search Tree
Easy
Maximum Subgraph Score in a Tree
Hard
Remove Comments3 Months
Medium
Binary Tree Inorder Traversal6 Months
Easy
Remove Duplicates from Sorted List
Easy
Parsing A Boolean Expression
Hard
Separate Black and White Balls
Medium
Max Number of K-Sum Pairs
Medium
Swap Nodes in Pairs6 Months
Medium
Closest Binary Search Tree Value
Easy
Statistics from a Large Sample
Medium
Meeting Rooms
Easy
Repeated Substring Pattern
Easy
Customers Who Never Order
Easy
Minimum Operations to Make Array Equal to Target3 Months
Hard
Get the Second Most Recent Activity
Hard
Construct Binary Tree from Preorder and Inorder Traversal6 Months
Medium
Minimum Number of Increments on Subarrays to Form a Target Array
Hard
Find Words Containing Character6 Months
Easy
Third Maximum Number
Easy
Find the Level of Tree with Minimum Sum
Medium
Flatten Nested List Iterator
Medium
Maximum Width of Binary Tree30 Days
Medium
Count of Smaller Numbers After Self3 Months
Hard
Repeated DNA Sequences
Medium
Binary Search Tree Iterator
Medium
Find the Maximum Length of Valid Subsequence II
Medium
Partition List
Medium
Increasing Triplet Subsequence6 Months
Medium
Find the Lexicographically Largest String From the Box I
Medium
24 Game
Hard
Max Dot Product of Two Subsequences
Hard
Power of Three
Easy
Reformat The String
Easy
Product Price at a Given Date
Medium
Create Hello World Function3 Months
Easy
Count Number of Pairs With Absolute Difference K
Easy
Lexicographical Numbers
Medium
Recover Binary Search Tree3 Months
Medium
Shortest Subarray with Sum at Least K
Hard
Count the Number of Substrings With Dominant Ones
Medium
Number of Ways to Split a String
Medium
Delete Tree Nodes
Medium
Count Hills and Valleys in an Array
Easy
Find the Median of the Uniqueness Array
Hard
Minimum Difference in Sums After Removal of Elements
Hard
Maximum Average Subarray I6 Months
Easy
Repeated String Match
Medium
Invert Binary Tree
Easy
Maximum Score Of Spliced Array
Hard
Bitwise OR of Even Numbers in an Array
Easy
Running Sum of 1d Array6 Months
Easy
Sign of the Product of an Array
Easy
Kids With the Greatest Number of Candies
Easy
Russian Doll Envelopes
Hard
Minimum Cost to Separate Sentence Into Rows
Medium
Contains Duplicate III
Hard
Valid Mountain Array
Easy
Swapping Nodes in a Linked List
Medium
Max Pair Sum in an Array
Easy
Find the Maximum Achievable Number
Easy
Single-Threaded CPU
Medium
Min Cost Climbing Stairs
Easy
Meeting Scheduler
Medium
Number of Steps to Reduce a Number in Binary Representation to One
Medium
Smallest Number With Given Digit Product
Medium
Shifting Letters6 Months
Medium
Find Eventual Safe States
Medium
Replace Employee ID With The Unique Identifier6 Months
Easy
Different Ways to Add Parentheses
Medium
Maximum Nesting Depth of the Parentheses
Easy
Find in Mountain Array
Hard
Letter Tile Possibilities
Medium
Path Sum6 Months
Easy
Friend Requests II: Who Has the Most Friends
Medium
Sum of Left Leaves
Easy
Maximum Binary Tree
Medium
Put Marbles in Bags
Hard
To Be Or Not To Be
Easy
Maximize Number of Nice Divisors
Hard
Find All The Lonely Nodes
Easy
Perfect Number6 Months
Easy
Shortest Subarray to be Removed to Make Array Sorted
Medium
Minimum Operations to Halve Array Sum
Medium
K-th Smallest in Lexicographical Order
Hard
Minimum Incompatibility
Hard
Maximum OR6 Months
Medium
Redundant Connection
Medium
Maximum Gap
Medium
All the Matches of the League
Easy
Count the Number of Fair Pairs
Medium
Delete N Nodes After M Nodes of a Linked List
Easy
Remove Duplicates from Sorted Array II
Medium
Wiggle Sort II30 Days
Medium
Smallest Integer Divisible by K6 Months
Medium
Maximum Price to Fill a Bag
Medium
Memoize
Medium
Arithmetic Slices
Medium
Minimum Add to Make Parentheses Valid
Medium
Shuffle String
Easy
Employees Earning More Than Their Managers
Easy
Primary Department for Each Employee
Easy
Cherry Pickup II
Hard
Nim Game
Easy
Confirmation Rate
Medium
Count Palindromic Subsequences
Hard
Evaluate Reverse Polish Notation6 Months
Medium
Longest Balanced Substring II6 Months
Medium
Score of a String
Easy
Sum of Distances in Tree
Hard
Get the Maximum Score6 Months
Hard
Maximum Candies Allocated to K Children
Medium
Longest Palindrome3 Months
Easy
Find the Original Typed String I
Easy
Count the Number of Special Characters II
Medium
Widest Pair of Indices With Equal Range Sum
Medium
Find the Celebrity
Medium
Balance a Binary Search Tree30 Days
Medium
Linked List Cycle3 Months
Easy
Search a 2D Matrix3 Months
Medium
The Number of Full Rounds You Have Played
Medium
Smallest Missing Integer Greater Than Sequential Prefix Sum
Easy
Type of Triangle
Easy
Strange Printer
Hard
Find Pivot Index
Easy
Maximum Size of a Set After Removals
Medium
Super Pow
Medium
Find the Difference of Two Arrays
Easy
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Medium
Hand of Straights
Medium
Calculate Money in Leetcode Bank6 Months
Easy
Equal Rational Numbers
Hard
Big Countries3 Months
Easy
Possible Bipartition
Medium
Count Substrings That Differ by One Character
Medium
Valid Parenthesis String6 Months
Medium
Maximum Subtree of the Same Color
Medium
Construct String With Repeat Limit
Medium
Matchsticks to Square
Medium
Convert Integer to the Sum of Two No-Zero Integers6 Months
Easy
Count Negative Numbers in a Sorted Matrix6 Months
Easy
Minimize Malware Spread6 Months
Hard
Lowest Common Ancestor of a Binary Tree III
Medium
Minimum Pair Removal to Sort Array I30 Days
Easy
Count Primes
Medium
Maximum Number That Sum of the Prices Is Less Than or Equal to K
Medium
Paint House6 Months
Medium
Element Appearing More Than 25% In Sorted Array
Easy
Predict the Winner
Medium
Factorial Trailing Zeroes
Medium
Maximum Frequency Stack
Hard
Design Search Autocomplete System
Hard
Remove Duplicates from Sorted List II
Medium
Magnetic Force Between Two Balls
Medium
Number of Steps to Reduce a Number to Zero
Easy
Merge Two 2D Arrays by Summing Values
Easy
Valid Tic-Tac-Toe State6 Months
Medium
Counter II
Easy
Tag Validator
Hard
Find Smallest Common Element in All Rows
Medium
Kth Missing Positive Number6 Months
Easy
Robot Room Cleaner6 Months
Hard
Most Profit Assigning Work
Medium
Spiral Matrix III
Medium
Two Best Non-Overlapping Events
Medium
Merge In Between Linked Lists
Medium
Integer Break
Medium
Average Height of Buildings in Each Segment
Medium
Implement Rand10() Using Rand7()
Medium
Palindrome Removal
Hard
Merge Nodes in Between Zeros
Medium
Binary Tree Level Order Traversal II
Medium
Guess Number Higher or Lower6 Months
Easy
Subtree of Another Tree6 Months
Easy
Maximum of Absolute Value Expression
Medium
Split Linked List in Parts
Medium
Maximum Size Subarray Sum Equals k
Medium
Create Maximum Number
Hard
Find if Path Exists in Graph30 Days
Easy
String Compression III
Medium
Count Paths With the Given XOR Value
Medium
Subarray Sums Divisible by K3 Months
Medium
H-Index6 Months
Medium
Minimum Number of Changes to Make Binary String Beautiful
Medium
Game Play Analysis I
Easy
Minimum Depth of Binary Tree3 Months
Easy
Rank Scores3 Months
Medium
Path with Maximum Probability
Medium
First Bad Version
Easy
Largest Divisible Subset
Medium
Nth Digit
Medium
Largest BST Subtree
Medium
Number of Operations to Make Network Connected
Medium
Accounts Merge6 Months
Medium
Binary Tree Preorder Traversal
Easy
Kth Smallest Product of Two Sorted Arrays
Hard
Unique Length-3 Palindromic Subsequences6 Months
Medium
Maximum Number of Events That Can Be Attended II
Hard
Continuous Subarrays
Medium
Classes With at Least 5 Students6 Months
Easy
Maximum Subsequence Score
Medium
Minesweeper3 Months
Medium
Frequency of the Most Frequent Element6 Months
Medium
Minimum Sensors to Cover Grid
Medium
Counting Bits
Easy
Bulb Switcher
Medium
Ransom Note6 Months
Easy
Binary Subarrays With Sum6 Months
Medium
Keyboard Row
Easy
Serialize and Deserialize N-ary Tree
Hard
Buildings With an Ocean View
Medium
Valid Triangle Number6 Months
Medium
Maximum Average Pass Ratio
Medium
House Robber IV3 Months
Medium
Minimum Number of Operations to Move All Balls to Each Box
Medium
Employee Free Time3 Months
Hard
Maximum Number of Alloys
Medium
Partition Array According to Given Pivot
Medium
Design Twitter3 Months
Medium
Maximum Employees to Be Invited to a Meeting
Hard
Set Mismatch
Easy
Rearranging Fruits
Hard
Maximum Number of Operations With the Same Score I
Easy
Count Complete Tree Nodes
Easy
Minimum Swaps to Group All 1's Together II
Medium
Rotate List3 Months
Medium
The kth Factor of n
Medium
Check if All A's Appears Before All B's
Easy
Minimum Swaps To Make Sequences Increasing
Hard
Day of the Week
Easy
Spiral Matrix IV
Medium
The K Weakest Rows in a Matrix
Easy
Maximum Absolute Sum of Any Subarray
Medium
Binary Tree Postorder Traversal
Easy
Find Largest Value in Each Tree Row
Medium
Rearrange Array Elements by Sign
Medium
Find the Minimum Amount of Time to Brew Potions
Medium
Sort Vowels in a String
Medium
Egg Drop With 2 Eggs and N Floors
Medium
Build Array from Permutation
Easy
Count Routes to Climb a Rectangular Grid3 Months
Hard
Reformat Department Table
Easy
GCD of Odd and Even Sums3 Months
Easy
Convert 1D Array Into 2D Array
Easy
Fix Names in a Table
Easy
Find X-Sum of All K-Long Subarrays I
Easy
Sort Array By Parity II
Easy
Convert the Temperature
Easy
Select Data6 Months
Easy
Maximum Sum of 3 Non-Overlapping Subarrays
Hard
XOR Queries of a Subarray
Medium
List the Products Ordered in a Period
Easy
Final Array State After K Multiplication Operations I
Easy
Count Partitions With Max-Min Difference at Most K
Medium
Longest Ideal Subsequence6 Months
Medium
Smallest Divisible Digit Product II
Hard
Longest Palindrome by Concatenating Two Letter Words
Medium
Second Minimum Time to Reach Destination
Hard
Mirror Reflection
Medium
Minimum Score After Removals on a Tree
Hard
Maximum Erasure Value
Medium
Delete Leaves With a Given Value
Medium
Reverse String II6 Months
Easy
Frog Jump II
Medium
Minimum Time to Repair Cars6 Months
Medium
Flatten a Multilevel Doubly Linked List6 Months
Medium
Find Minimum in Rotated Sorted Array II
Hard
Find the Original Typed String II
Hard
Longest ZigZag Path in a Binary Tree
Medium
Paths in Matrix Whose Sum Is Divisible by K6 Months
Hard
Valid Boomerang
Easy
Binary Tree Pruning
Medium
Count Residue Prefixes3 Months
Easy
Count Subarrays Where Max Element Appears at Least K Times
Medium
Design a Food Rating System
Medium
Count Unique Characters of All Substrings of a Given String
Hard
Set Intersection Size At Least Two6 Months
Hard
Greatest Sum Divisible by Three3 Months
Medium
Actors and Directors Who Cooperated At Least Three Times
Easy
Count Number of Texts
Medium
Number of Employees Who Met the Target
Easy
Longest Happy Prefix6 Months
Hard
Count Subarrays of Length Three With a Condition
Easy
Maximize Happiness of Selected Children3 Months
Medium
Construct the Lexicographically Largest Valid Sequence
Medium
Clear Digits
Easy
Find the Maximum Length of Valid Subsequence I
Medium
Count the Number of Ideal Arrays
Hard
Check If Digits Are Equal in String After Operations I
Easy
Frequency Tracker
Medium
Shortest Distance After Road Addition Queries I
Medium
Read N Characters Given Read4
Easy
Twisted Mirror Path Count6 Months
Medium
Minimum Operations to Make a Subsequence
Hard
Minimum Pair Removal to Sort Array II6 Months
Hard
Stone Game
Medium
Adjacent Increasing Subarrays Detection I
Easy
The Two Sneaky Numbers of Digitville6 Months
Easy
Number of Subsequences That Satisfy the Given Sum Condition
Medium
Last Stone Weight II
Medium
Minimum Operations to Make Array Sum Divisible by K
Easy
Convert BST to Greater Tree
Medium
Average of Levels in Binary Tree
Easy
Minimum Index of a Valid Split
Medium
Insert Greatest Common Divisors in Linked List
Medium
Patients With a Condition
Easy
Count Partitions with Even Sum Difference
Easy
Array Partition
Easy
Elimination Game
Medium
Circular Array Loop
Medium
String Matching in an Array
Easy
Time Needed to Inform All Employees
Medium
Find Right Interval
Medium
Minimum Operations to Make Array Values Equal to K
Easy
Maximum Number of K-Divisible Components
Hard
Minimum Cost to Convert String I
Medium
Count the Number of Complete Components
Medium
Check If a String Contains All Binary Codes of Size K
Medium
Coloring A Border
Medium
Car Fleet II30 Days
Hard
Rearrange Words in a Sentence6 Months
Medium
Reach a Number
Medium
Bag of Tokens
Medium
Number of Ways to Paint N × 3 Grid
Hard
Maximum Sum With at Most K Elements
Medium
Reducing Dishes
Hard
Append Characters to String to Make Subsequence
Medium
Maximum Number of Fish in a Grid
Medium
Number of Smooth Descent Periods of a Stock6 Months
Medium
Range Sum Query - Mutable
Medium
Check Knight Tour Configuration
Medium
Number of Sub-arrays With Odd Sum
Medium
Combination Sum III
Medium
Generate Binary Strings Without Adjacent Zeros
Medium
Seat Reservation Manager
Medium
Cells with Odd Values in a Matrix
Easy
N-ary Tree Level Order Traversal
Medium
Delete Operation for Two Strings
Medium
The Dining Philosophers
Medium
Design Task Manager6 Months
Medium
Number of Spaces Cleaning Robot Cleaned
Medium
The Latest Time to Catch a Bus
Medium
Count Collisions of Monkeys on a Polygon
Medium
Transform Array to All Equal Elements
Medium
Build an Array With Stack Operations6 Months
Medium
Smallest Missing Non-negative Integer After Operations
Medium
Find K-th Smallest Pair Distance
Hard
Arithmetic Slices II - Subsequence
Hard
Minimum Average of Smallest and Largest Elements
Easy
K-Concatenation Maximum Sum
Medium
Distinct Prime Factors of Product of Array
Medium
Fruits Into Baskets III
Medium
Maximum Level Sum of a Binary Tree3 Months
Medium
Merge BSTs to Create Single BST
Hard
Minimize XOR
Medium
Maximum Total Importance of Roads
Medium
Flip Columns For Maximum Number of Equal Rows
Medium
Sum of k-Mirror Numbers
Hard
Maximum Frequency After Subarray Operation
Medium
Robot Return to Origin
Easy
Sorting the Sentence6 Months
Easy
Count Symmetric Integers
Easy
Longest Turbulent Subarray
Medium
Minimum Sum of Mountain Triplets I
Easy
Goat Latin
Easy
Largest Odd Number in String6 Months
Easy
Hamming Distance
Easy
Largest Multiple of Three
Hard
Number of Ways to Arrive at Destination
Medium
Corporate Flight Bookings
Medium
Partition Array for Maximum Sum
Medium
Magical String
Medium
Beautiful Array
Medium
Make Array Elements Equal to Zero
Easy
Make Two Arrays Equal by Reversing Subarrays
Easy
Maximum Difference Between Adjacent Elements in a Circular Array
Easy
Construct Binary Tree from Preorder and Postorder Traversal
Medium
Insertion Sort List
Medium
Bitwise AND of Numbers Range
Medium
Minimum Cost Walk in Weighted Graph
Hard
Smallest Value of the Rearranged Number
Medium
Minimum Increments to Equalize Leaf Paths6 Months
Medium
Get Equal Substrings Within Budget
Medium
Divide an Array Into Subarrays With Minimum Cost I30 Days
Easy
Recover a Tree From Preorder Traversal
Hard
Construct the Longest New String
Medium
Prime Subtraction Operation
Medium
Painting a Grid With Three Different Colors
Hard
Friends Of Appropriate Ages
Medium
Cousins in Binary Tree II
Medium
Row With Maximum Ones
Easy
Maximum Value of an Ordered Triplet II
Medium
Partition Array into Disjoint Intervals
Medium
Binary Watch3 Months
Easy
Swap Sex of Employees
Easy
Flip Equivalent Binary Trees
Medium
Largest Component Size by Common Factor3 Months
Hard
Maximum Odd Binary Number
Easy
Ways to Express an Integer as Sum of Powers
Medium
Check if the Sentence Is Pangram6 Months
Easy
Search in a Sorted Array of Unknown Size
Medium
Shortest Distance to a Character
Easy
Magic Squares In Grid
Medium
Circle and Rectangle Overlapping
Medium
Cat and Mouse
Hard
Find if Array Can Be Sorted
Medium
Total Cost to Hire K Workers
Medium
Construct the Minimum Bitwise Array I
Easy
Count Number of Maximum Bitwise-OR Subsets
Medium
Maximum Length of a Concatenated String with Unique Characters
Medium
Maximize Subarrays After Removing One Conflicting Pair
Hard
Duplicate Zeros
Easy
Final Value of Variable After Performing Operations
Easy
Super Ugly Number6 Months
Medium
Four Divisors3 Months
Medium
Reschedule Meetings for Maximum Free Time II
Medium
Check if Object Instance of Class
Medium
Number of Increasing Paths in a Grid
Hard
Minimum Initial Energy to Finish Tasks6 Months
Hard
Most Common Word
Easy
Determine Whether Matrix Can Be Obtained By Rotation
Easy
Can Make Arithmetic Progression From Sequence3 Months
Easy
Zero Array Transformation I
Medium
Chunk Array
Easy
Number of Segments in a String
Easy
Count Non-Decreasing Subarrays After K Operations
Hard
Minimum Swaps to Make Strings Equal
Medium
Maximum Twin Sum of a Linked List
Medium
Minimum Total Distance Traveled
Hard
Construct the Minimum Bitwise Array II6 Months
Medium
Count Number of Bad Pairs
Medium
Super Palindromes
Hard
Check Completeness of a Binary Tree
Medium
Total Hamming Distance
Medium
Word Frequency
Medium
Find Longest Special Substring That Occurs Thrice I
Medium
Special Array With X Elements Greater Than or Equal X
Easy
Number of Zero-Filled Subarrays
Medium
Maximum Capacity Within Budget3 Months
Medium
Finding 3-Digit Even Numbers
Easy
Reveal Cards In Increasing Order
Medium
Find Smallest Letter Greater Than Target
Easy
Check If N and Its Double Exist
Easy
Numbers With Repeated Digits
Hard
Harshad Number
Easy
Minimum Domino Rotations For Equal Row
Medium
Shortest Path Visiting All Nodes
Hard
Removing Stars From a String
Medium
Binary Prefix Divisible By 5
Easy
Gray Code
Medium
Push Dominoes
Medium
Sum of All Subset XOR Totals
Easy
Count Special Quadruplets
Easy
Implement Trie II (Prefix Tree)
Medium
Knight Dialer
Medium
Minimum Number of Moves to Seat Everyone
Easy
Kth Largest Sum in a Binary Tree
Medium
Minimum Number of Vertices to Reach All Nodes
Medium
Minimum Time Visiting All Points
Easy
Array Reduce Transformation
Easy
Move Pieces to Obtain a String
Medium
Queries Quality and Percentage
Easy
Smallest Palindromic Rearrangement I
Medium
Maximum Energy Boost From Two Drinks
Medium
Array Prototype Last
Easy
Trionic Array II
Hard
Minimum Cost to Hire K Workers
Hard
Delete Nodes From Linked List Present in Array
Medium
Minimum Operations to Make a Uni-Value Grid
Medium
To Lower Case
Easy
Maximum Number of Points with Cost
Medium
Minimum Time to Visit a Cell In a Grid
Hard
Solving Questions With Brainpower
Medium
Count the Number of Incremovable Subarrays I
Easy
Jump Game VI
Medium
Find the K-th Character in String Game I
Easy
Longest Subarray With Maximum Bitwise AND
Medium
Smallest Good Base
Hard
Split a String Into the Max Number of Unique Substrings
Medium
Sort Array By Parity
Easy
Zero Array Transformation III
Medium
K-th Symbol in Grammar
Medium
Number of Squareful Arrays
Hard
Tuple with Same Product
Medium
Product Sales Analysis III6 Months
Medium
Count of Interesting Subarrays
Medium
Binary Searchable Numbers in an Unsorted Array3 Months
Medium
Find Kth Bit in Nth Binary String
Medium
Unique Binary Search Trees II
Medium
Minimum Number of Operations to Make Elements in Array Distinct
Easy
Maximum XOR of Two Numbers in an Array
Medium
Implement Router
Medium
Double a Number Represented as a Linked List
Medium
Counting Words With a Given Prefix
Easy
Minimum Moves to Equal Array Elements
Medium
Domino and Tromino Tiling
Medium
Defuse the Bomb
Easy
Number Complement
Easy
Transformed Array
Easy
Smallest Number With All Set Bits6 Months
Easy
Count of Substrings Containing Every Vowel and K Consonants II
Medium
Smallest Number in Infinite Set
Medium
Find the Largest Area of Square Inside Two Rectangles3 Months
Medium
Detect Capital
Easy
Length of Longest Fibonacci Subsequence
Medium
Remove Nodes From Linked List
Medium
Calculator with Method Chaining6 Months
Easy
Maximum Number of Words Found in Sentences
Easy
Smallest Subarrays With Maximum Bitwise OR
Medium
Equal Row and Column Pairs
Medium
Queens That Can Attack the King
Medium
Longest Square Streak in an Array
Medium
Count Total Number of Colored Cells
Medium
Count of Matches in Tournament
Easy
Inorder Successor in BST II
Medium
Validate Binary Tree Nodes
Medium
Base 7
Easy
Add Two Promises
Easy
Adding Spaces to a String
Medium
Minimum Jumps to Reach Home
Medium
Find Unique Binary String
Medium
Maximum 69 Number
Easy
Root Equals Sum of Children
Easy
Triangle Judgement
Easy
Rank Transform of an Array
Easy
Minimum Limit of Balls in a Bag
Medium
Add One Row to Tree
Medium
Check if One String Swap Can Make Strings Equal
Easy
Largest Combination With Bitwise AND Greater Than Zero
Medium
New 21 Game
Medium