Most Popular Coding Questions — Company Wise List : Part 3
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Part 1 of this series -
Part2:
Amazon
- Binary Tree Zigzag Level Order Traversal
- Rotate Image
- Partition Labels
- Integer to English Words
- Lowest Common Ancestor of a Binary Tree
- Best Time to Buy and Sell Stock
- Letter Combinations of a Phone Number
- Word Ladder II
- Word Break II
- Longest Substring Without Repeating Characters
- Min Stack
- Cut Off Trees for Golf Event
- Median of Two Sorted Arrays
- Compare Version Numbers
- Subtree of Another Tree
- Word Search II
- Sliding Window Maximum
- Integer to Roman
- Search a 2D Matrix II
- Alien Dictionary
- Word Break
- Prison Cells After N Days
- Product of Array Except Self
- Search in Rotated Sorted Array
- Meeting Rooms II
- Design In-Memory File System
- Top K Frequent Elements
- 3Sum
- Reverse Linked List
- Merge Intervals
- Design Tic-Tac-Toe
- Group Anagrams
- Two Sum
- LRU Cache
- Number of Islands
- Reorder Data in Log Files
- K Closest Points to Origin
- Longest Palindromic Substring
- Copy List with Random Pointer
- Critical Connections in a Network
- Most Common Word
- Valid Parentheses
- Trapping Rain Water
- Merge k Sorted Lists
- Add Two Numbers
- Serialize and Deserialize Binary Tree
- Find Median from Data Stream
- Word Ladder
- Merge Two Sorted Lists
- Jump Game II
- Design Search Autocomplete System
- Maximum Subarray
- Word Search
- First Unique Character in a String
- Minimum Window Substring
- Find All Anagrams in a String
- Spiral Matrix
- Validate Binary Search Tree
- Concatenated Words
- Binary Tree Maximum Path Sum
- Snakes and Ladders
- Insert Delete GetRandom O(1)
- Container With Most Water
- LFU Cache
- Kth Largest Element in an Array
- Course Schedule
- Binary Tree Vertical Order Traversal
- Lowest Common Ancestor of a Binary Search Tree
- Flatten Nested List Iterator
- Construct Binary Tree from Preorder and Inorder Traversal
- Roman to Integer
- Binary Tree Level Order Traversal
- Populating Next Right Pointers in Each Node
- Implement Trie (Prefix Tree)
- The Maze II
- Coin Change
- Max Points on a Line
- Boundary of Binary Tree
- Reverse Nodes in k-Group
- Populating Next Right Pointers in Each Node II
- Course Schedule II
- The Maze
- Largest Rectangle in Histogram
- Max Area of Island
- The Skyline Problem
- Pow(x, n)
- Flood Fill
- Top K Frequent Words
- Restore IP Addresses
- Generate Parentheses
- Basic Calculator
- Find the Celebrity
- String to Integer (atoi)
- Palindrome Linked List
- Design Hit Counter
- Game of Life
- Design Excel Sum Formula
- Zigzag Iterator
- Subsets
- Rotting Oranges
- Unique Paths
- Serialize and Deserialize BST
- Clone Graph
- Shuffle an Array
- Symmetric Tree
- Jump Game
- Intersection of Two Linked Lists
- All Nodes Distance K in Binary Tree
- Pacific Atlantic Water Flow
- Decode Ways
- Gas Station
- Summary Ranges
- Add Two Numbers II
- Linked List Cycle
- Recover Binary Search Tree
- Best Time to Buy and Sell Stock II
- Search a 2D Matrix
- Next Permutation
- Baseball Game
- Minimum Path Sum
- Binary Tree Right Side View
- Number of Distinct Islands II
- Two Sum IV — Input is a BST
- Binary Search Tree Iterator
- Meeting Rooms
- Maximal Square
- Longest Valid Parentheses
- Regular Expression Matching
- Unique Binary Search Trees
- Best Time to Buy and Sell Stock III
- Basic Calculator II
- Climbing Stairs
- Minimum Cost For Tickets
- Simplify Path
- Closest Binary Search Tree Value
- Inorder Successor in BST
- Kth Largest Element in a Stream
- Largest Number
- Palindrome Pairs
- Triangle
- Reorder List
- Shortest Distance from All Buildings
- Insert Interval
- Graph Valid Tree
- Spiral Matrix II
- Diameter of Binary Tree
- Two Sum II — Input array is sorted
- Number of Distinct Islands
- Minimum Cost to Merge Stones
- Edit Distance
- Peeking Iterator
- Encode and Decode TinyURL
- Evaluate Reverse Polish Notation
- Find Minimum in Rotated Sorted Array
- Reverse Words in a String
- Merge Sorted Array
- Majority Element
- Employee Free Time
- Subarray Sum Equals K
- Decode String
- Candy
- Longest Substring with At Most K Distinct Characters
- Count of Smaller Numbers After Self
- Implement Queue using Stacks
- Department Top Three Salaries
- Moving Average from Data Stream
- Missing Number
- Swap Nodes in Pairs
- Find K Pairs with Smallest Sums
- Number of Connected Components in an Undirected Graph
- Find Duplicate Subtrees
- Prime Palindrome
- Maximum Frequency Stack
- Path Sum II
- Combination Sum
- Maximum Product Subarray
- Permutations
- Design Snake Game
- Longest Increasing Subsequence
- Construct Binary Tree from Inorder and Postorder Traversal
- Convert BST to Greater Tree
- Interleaving String
- Text Justification
- Sort Colors
- Single Number
- Set Matrix Zeroes
- Basic Calculator III
- Largest BST Subtree
- Longest Palindromic Subsequence
- Implement strStr()
- Next Greater Element II
- Valid Sudoku
- Cheapest Flights Within K Stops
- Walls and Gates
- Best Time to Buy and Sell Stock IV
- Minesweeper
- Longest Absolute File Path
- Reverse Linked List II
- Maximum Depth of Binary Tree
- Reverse String
- Find the Closest Palindrome
- Maximum Product of Three Numbers
- Most Frequent Subtree Sum
- Coin Change 2
- Valid Parenthesis String
- Find K Closest Elements
- Remove Nth Node From End of List
- Island Perimeter
- Exclusive Time of Functions
- 132 Pattern
- 3Sum Closest
- Longest Consecutive Sequence
- Implement Stack using Queues
- Unique Paths II
- Single Element in a Sorted Array
- Valid Anagram
- Longest Palindrome
- Reconstruct Itinerary
- Palindrome Permutation
- Find the Duplicate Number
- 4Sum
- N-Queens
- Reverse Words in a String II
- Maximum Size Subarray Sum Equals k
- Linked List Cycle II
- Path Sum
- Next Greater Element I
- Burst Balloons
- Design HashMap
- Remove K Digits
- Robot Room Cleaner
- Wildcard Matching
- Find the Shortest Superstring
- Same Tree
- Connecting Cities With Minimum Cost
- Longest Common Prefix
- Unique Paths III
- Insert Delete GetRandom O(1) — Duplicates allowed
- Power of Two
- Rotate List
- Binary Tree Longest Consecutive Sequence
- Surrounded Regions
- Flatten 2D Vector
- Add and Search Word — Data structure design
- Substring with Concatenation of All Words
- Divide Two Integers
- Search in Rotated Sorted Array II
- Remove Linked List Elements
- Basic Calculator IV
- Palindromic Substrings
- Fizz Buzz
- Second Highest Salary
- Flatten Binary Tree to Linked List
- Convert Sorted Array to Binary Search Tree
- Palindrome Number
- Reverse Integer
- Minimum Cost to Connect Sticks
- Sort List
- ZigZag Conversion
- Find All Duplicates in an Array
- Palindrome Partitioning
- Max Stack
- Split Array With Same Average
- First Missing Positive
- Longest Duplicate Substring
- Convert Sorted List to Binary Search Tree
- Kth Smallest Element in a Sorted Matrix
- Rectangle Overlap
- Intersection of Two Arrays
- Find the Town Judge
- Sqrt(x)
- Next Greater Element III
- Diagonal Traverse
- Nth Highest Salary
- Partition List
- Reorganize String
- Intersection of Two Arrays II
- Count Primes
- Two Sum Less Than K
- Kth Smallest Element in a BST
- Bus Routes
- Queue Reconstruction by Height
- 01 Matrix
- Longest Increasing Path in a Matrix
- Combination Sum IV
- Remove Invalid Parentheses
- Combine Two Tables
- Majority Element II
- Maximal Rectangle
- Shortest Path in Binary Matrix
- Binary Tree Inorder Traversal
- Daily Temperatures
- Shortest Path Visiting All Nodes
- Fraction to Recurring Decimal
- House Robber
- Odd Even Linked List
- Find First and Last Position of Element in Sorted Array
- Cousins in Binary Tree
- Solve the Equation
- Serialize and Deserialize N-ary Tree
- K-Similar Strings
- Friend Circles
- Longest Substring with At Most Two Distinct Characters
- Data Stream as Disjoint Intervals
- Binary Tree Paths
- Find Peak Element
- Perfect Squares
- Knight Probability in Chessboard
- Subarrays with K Different Integers
- Gray Code
- Analyze User Website Visit Pattern
- Sliding Puzzle
- Frog Jump
- Design Circular Queue
- Contains Duplicate
- Balanced Binary Tree
- Remove Duplicate Letters
- Maximum Gap
- Move Zeroes
- Employee Importance
- Permutation Sequence
- Number of Dice Rolls With Target Sum
- Rotate Array
- Remove Duplicates from Sorted List
- Merge Two Binary Trees
- Count Univalue Subtrees
- Invert Binary Tree
- Isomorphic Strings
- Valid Palindrome
- Minimum Genetic Mutation
- Plus One Linked List
- Sum Root to Leaf Numbers
- Evaluate Division
- Shortest Word Distance
- High Five
- Count and Say
- Subsets II
- Design Twitter
- Combination Sum II
- Plus One
- Maximum Width of Binary Tree
- Minimum Depth of Binary Tree
- Closest Binary Search Tree Value II
- Sliding Window Median
- Delete Node in a Linked List
- Number of 1 Bits
- Unique Email Addresses
- Pairs of Songs With Total Durations Divisible by 60
- Single Number II
- Flatten a Multilevel Doubly Linked List
- Repeated DNA Sequences
- Super Washing Machines
- Is Graph Bipartite?
- Guess the Word
- Wiggle Sort
- Minimum Window Subsequence
- Insert into a Sorted Circular Linked List
- Transpose Matrix
- Preimage Size of Factorial Zeroes Function
- Pascal’s Triangle
- Dungeon Game
- Design Log Storage System
- My Calendar III
- Random Pick with Weight
- Last Stone Weight
- Smallest Range Covering Elements from K Lists
- Binary Search Tree to Greater Sum Tree
- Maximum Average Subtree
- Sudoku Solver
- Excel Sheet Column Number
- K-diff Pairs in an Array
- Bulls and Cows
- Sum of Root To Leaf Binary Numbers
- Time Based Key-Value Store
- Convert Binary Search Tree to Sorted Doubly Linked List
- Path With Maximum Minimum Value
- Video Stitching
- Max Increase to Keep City Skyline
- Next Greater Node In Linked List
- Path Sum III
- Find K-th Smallest Pair Distance
- Bomb Enemy
- Find K-Length Substrings With No Repeated Characters
- Remove Duplicates from Sorted List II
- Number of Digit One
- One Edit Distance
- Split Linked List in Parts
- Best Time to Buy and Sell Stock with Cooldown
- Sort Characters By Frequency
- My Calendar I
- Valid Tic-Tac-Toe State
- Reverse Bits
- Shortest Palindrome
- Random Pick with Blacklist
- Longest Univalue Path
- Two Sum BSTs
- Vertical Order Traversal of a Binary Tree
- Longest Repeating Substring
- Interval List Intersections
- Task Scheduler
- Minimum Size Subarray Sum
- Minimum Distance Between BST Nodes
- Palindrome Partitioning II
- Number of Islands II
- Stream of Characters
- Single Number III
- Employees Earning More Than Their Managers
- All Paths From Source to Target
- Fibonacci Number
- Line Reflection
- Missing Element in Sorted Array
- Reverse String II
- Sort Array By Parity
- Third Maximum Number
- Distinct Subsequences
- Jewels and Stones
- Min Cost Climbing Stairs
- Validate IP Address
- RLE Iterator
- Complete Binary Tree Inserter
- Web Crawler
- Maximum Difference Between Node and Ancestor
- Longest Turbulent Subarray
- Find Leaves of Binary Tree
- Redundant Connection
- Find the Derangement of An Array
- Relative Sort Array
- String Compression
- Delete Node in a BST
- Rank Scores
- Average of Levels in Binary Tree
- Range Sum Query 2D — Immutable
- Trapping Rain Water II
- Permutations II
- Sales Analysis III
- Ugly Number II
- Word Frequency
- Rotate String
- Missing Ranges
- Reverse Vowels of a String
- Count Complete Tree Nodes
- Permutation in String
- Insert into a Binary Search Tree
- Minimum Number of Arrows to Burst Balloons
- Longest Substring with At Least K Repeating Characters
- Valid Triangle Number
- Increasing Triplet Subsequence
- Find Common Characters
- Search in a Sorted Array of Unknown Size
- Construct Binary Tree from String
- Non-overlapping Intervals
- Nested List Weight Sum
- Contiguous Array
- Perfect Number
- House Robber III
- Remove Comments
- Number of Atoms
- Shortest Word Distance II
- Partition to K Equal Sum Subsets
- Binary Tree Postorder Traversal
- Rearrange String k Distance Apart
- Partition Equal Subset Sum
- Maximum Depth of N-ary Tree
- Elimination Game
- Multiply Strings
- Integer Replacement
- Sentence Similarity II
- Making A Large Island
- Max Consecutive Ones
- Sales Analysis II
- Customers Who Never Order
- Find Duplicate File in System
- Minimum Number of Refueling Stops
- Minimum Area Rectangle II
- Path In Zigzag Labelled Binary Tree
- Cherry Pickup
- Reaching Points
- License Key Formatting
- Prime Number of Set Bits in Binary Representation
- Accounts Merge
- Different Ways to Add Parentheses
- Find Cumulative Salary of an Employee
- Fruit Into Baskets
- Add Strings
- Robot Return to Origin
- Maximum Length of Pair Chain
- Search Insert Position
- DI String Match
- Add Digits
- Wiggle Subsequence
- Network Delay Time
- Construct Binary Tree from Preorder and Postorder Traversal
- Happy Number
- Shortest Unsorted Continuous Subarray
- Pascal’s Triangle II
- Split Array into Fibonacci Sequence
- Open the Lock
- Split Array Largest Sum
- 4Sum II
- Minimum Area Rectangle
- Add Binary
- Remove All Adjacent Duplicates In String
- K Empty Slots
- Camelcase Matching
- Word Pattern
- Most Profit Assigning Work
- Custom Sort String
- Kill Process
- Lemonade Change
- Maximum Level Sum of a Binary Tree
- Keys and Rooms
- Create Maximum Number
- Longest Word in Dictionary
- Trim a Binary Search Tree
- Campus Bikes II
- Range Sum of BST
- Find Minimum in Rotated Sorted Array II
- Remove Element
- Binary Tree Longest Consecutive Sequence II
- Vowel Spellchecker
- Maximum Binary Tree
- Counting Bits
- Binary Tree Preorder Traversal
- Peak Index in a Mountain Array
- Car Pooling
- Palindrome Permutation II
- Is Subsequence
- Closest Leaf in a Binary Tree
- Boats to Save People
- Range Sum Query
- Sum of Left Leaves
- Height Checker
- Squares of a Sorted Array
- Print in Order
- Number of Submatrices That Sum to Target
- Array Partition I
- Longest Common Subsequence
- My Calendar II
- Max Consecutive Ones III
- Subdomain Visit Count
- Subarray Sums Divisible by K
- Product Sales Analysis I
- Sort Array By Parity II
- Trips and Users
- Distribute Coins in Binary Tree
- Two City Scheduling
- Asteroid Collision
- N-Queens II
- N-ary Tree Level Order Traversal
- Construct Binary Search Tree from Preorder Traversal
- Flip Equivalent Binary Trees
- Delete Duplicate Emails
- Campus Bikes
- Logger Rate Limiter
- Minimum Domino Rotations For Equal Row
- Search Suggestions System
- Image Smoother
- Rotate Function
- Equal Tree Partition
- Repeated Substring Pattern
- Construct String from Binary Tree
- Complex Number Multiplication
- Optimal Division
- Set Mismatch
- Monotone Increasing Digits
- Global and Local Inversions
- Split BST
- Minimum Swaps To Make Sequences Increasing
- Loud and Rich
- Find and Replace Pattern
- Orderly Queue
- Numbers At Most N Given Digit Set
- Digit Count in Range
- Index Pairs of a String
- Sum of Digits in the Minimum Number
- Number of Days in a Month
- Remove Vowels from a String
- Armstrong Number
- Recover a Tree From Preorder Traversal
- Largest Unique Number
- Uncrossed Lines
- Find Words That Can Be Formed by Characters
- Customers Who Bought All Products
- Actors and Directors Who Cooperated At Least Three Times
- Distant Barcodes
- Product Sales Analysis II
- Product Sales Analysis III
- Insufficient Nodes in Root to Leaf Paths
- Sales Analysis I
- Handshakes That Don’t Cross
- Number of Equivalent Domino Pairs
- Shortest Path with Alternating Colors
- Prime Arrangements
- Diet Plan Performance Reformat Department Table
- Maximum Score Words Formed by Letters
- Average Selling Price
- Shift 2D Grid
Dropbox
- Letter Combinations of a Phone Number
- Grid Illumination
- Design Search Autocomplete System
- Number of Valid Words for Each Puzzle
- Word Pattern
- Word Break II
- Web Crawler
- LRU Cache
- Pairs of Songs With Total Durations Divisible by 60
- Minimum Path Sum
- Two Sum
- Median of Two Sorted Arrays
- Implement strStr()
- Merge k Sorted Lists
- Check If It Is a Good Array
- Find Duplicate File in System
- Game of Life
- Minimize Malware Spread
- Design Phone Directory
- Design Hit Counter
- Word Pattern II
- Minimize Malware Spread II
- Web Crawler Multithreaded
Adobe
- Rank Scores
- Longest Increasing Subsequence
- Number of Islands
- Largest Rectangle in Histogram
- Word Break
- Valid Number
- Department Top Three Salaries
- Contains Duplicate
- Binary Tree Level Order Traversal II
- Sliding Window Maximum
- Diameter of Binary Tree
- Trim a Binary Search Tree
- Binary Tree Right Side View
- Contains Duplicate II
- Unique Paths
- Validate Binary Search Tree
- Spiral Matrix II
- Vertical Order Traversal of a Binary Tree
- Basic Calculator
- Valid Palindrome
- Minimum Path Sum
- Factorial Trailing Zeroes
- Combinations
- Search Insert Position
- Remove K Digits
- LFU Cache
- Human Traffic of Stadium
- The Skyline Problem
- Evaluate Division
- Squares of a Sorted Array
- Valid Sudoku
- Repeated String Match
- Middle of the Linked List
- Sum of Left Leaves
- Path Sum
- Defanging an IP Address
- Graph Valid Tree
- Stone Game
- Max Area of Island
- Merge Two Binary Trees
- Longest Substring with At Most Two Distinct
- Two Sum
- Add Two Numbers
- Median of Two Sorted Arrays
- Combine Two Tables
- Reverse Integer
- Longest Substring Without Repeating Characters
- Roman to Integer
- 3Sum
- Longest Palindromic Substring
- Merge Two Sorted Lists
- ZigZag Conversion
- Longest Common Prefix
- Palindrome Number
- Word Frequency
- Tenth Line
- Container With Most Water
- Cherry Pickup
- LRU Cache
- Reverse String
- Lexicographical Numbers
- Maximum Subarray
- Reverse Linked List
- Sum of Two Integers
- Nth Highest Salary
- Jewels and Stones
- Big Countries
- Merge Sorted Array
- String to Integer (atoi)
- Hamming Distance
- 4Sum
- Delete Node in a Linked List
- Regular Expression Matching
- Pow(x, n)
- Nim Game
- Add Digits
- Generate Parentheses
- Integer to Roman
- Shortest Palindrome
- Permutations
- Best Time to Buy and Sell Stock
- Single Number
- Merge k Sorted Lists
- Palindrome Partitioning
- Valid Parentheses
- Longest Valid Parentheses
- First Missing Positive
- Maximal Rectangle
- Minimum Window Substring
- Substring with Concatenation of All Words
- Patching Array
- Climbing Stairs
- Product of Array Except Self
- Encode and Decode TinyURL
- Search in Rotated Sorted Array
- Subsets
- Sort List
- Count and Say
- House Robber
- 3Sum Closest
- Min Stack
- Number of Subarrays with Bounded Maximum
- Wildcard Matching
- Find All Numbers Disappeared in an Array
- Palindrome Linked List
- Next Permutation
- Count Primes
- Trapping Rain Water
- Spiral Matrix
- Add Binary
- Unique Email Addresses
- Copy List with Random Pointer
- Remove Nth Node From End of List
- Longest Increasing Path in a Matrix
- Majority Element
- Best Time to Buy and Sell Stock II
- Coin Change
- Perfect Squares
- Find Minimum in Rotated Sorted Array II
- Group Anagrams
- Search in Rotated Sorted Array II
- Invert Binary Tree
- Construct Binary Tree from Preorder and Inorder Traversal
- Unique Binary Search Trees II
- Number of Atoms
- N-Queens
- Merge Intervals
- Linked List Cycle II
- Largest Divisible Subset
- Search a 2D Matrix
- Maximum Product Subarray
- Convert Sorted List to Binary Search Tree
- Rotate Image
- Reverse Linked List II
System Design with Questions
- Fizz Buzz
- Self Dividing Numbers
- Kth Smallest Element in a Sorted Matrix
- First Bad Version
- H-Index
- Binary Tree Maximum Path Sum
- Symmetric Tree
- Add Strings
- Lowest Common Ancestor of a Binary Search Tree
- Missing Number
- Rectangle Overlap
- Jump Game II
- Decode Ways
- Reorder List
- Divide Two Integers
- Rotate Array
- Edit Distance
- Characters
- Pascal’s Triangle
- Palindromic Substrings
- Daily Temperatures
- Binary Tree Level Order Traversal
- Permutations II
- Flatten Binary Tree to Linked List
- Isomorphic Strings
- To Lower Case
- Kth Largest Element in an Array
- Design HashMap
- Print in Order
- Insert Interval
- Search in a Binary Search Tree
- Insert Delete GetRandom O(1)
- Binary Tree Postorder Traversal
- Preimage Size of Factorial Zeroes Function
- Smallest Range I
- Smallest Range II
- Reverse Substrings Between Each Pair of Parentheses
Part 4 :
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