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Previous Year Questions

Remove Invalid Parentheses

Integer to English Words

Verifying an Alien Dictionary

Read N Characters Given Read4 II - Call multiple times

Serialize and Deserialize Binary Tree

Regular Expression Matching

Meeting Rooms II

Product of Array Except Self

Valid Palindrome II

Subarray Sum Equals K

First Bad Version

Minimum Window Substring

K Closest Points to Origin

Merge k Sorted Lists

Minimum Remove to Make Valid Parentheses

Valid Palindrome

Divide Two Integers

Next Permutation

Binary Search Tree Iterator

Expression Add Operators

Add and Search Word - Data structure design

Read N Characters Given Read4

Binary Tree Maximum Path Sum

Binary Tree Vertical Order Traversal

Letter Combinations of a Phone Number

Merge Intervals

Convert Binary Search Tree to Sorted Doubly Linked List

Alien Dictionary

Maximum Size Subarray Sum Equals k

Find All Anagrams in a String

Sparse Matrix Multiplication

Number of Islands

Palindrome Pairs

Kth Largest Element in an Array

Diameter of Binary Tree

Binary Tree Paths

Continuous Subarray Sum

Find the Celebrity

Multiply Strings

Validate Binary Search Tree

Trapping Rain Water

Maximum Sum of 3 Non-Overlapping Subarrays

Intersection of Two Arrays

Longest Substring with At Most K Distinct Characters

Best Time to Buy and Sell Stock

Merge Sorted Array

Flatten Binary Tree to Linked List

Copy List with Random Pointer

Exclusive Time of Functions

One Edit Distance

Range Sum Query 2D - Immutable

Binary Tree Right Side View

Is Graph Bipartite?

Search in Rotated Sorted Array

Shortest Distance from All Buildings

Lowest Common Ancestor of a Binary Tree

Walls and Gates

Interval List Intersections

Find First and Last Position of Element in Sorted Array

Flatten Nested List Iterator

Monotonic Array

Random Pick Index

Valid Parentheses

Basic Calculator II

Insert Interval

Closest Binary Search Tree Value

Intersection of Two Arrays II

Sort Transformed Array

Friends Of Appropriate Ages

Rearrange String k Distance Apart

Longest Valid Parentheses

Strobogrammatic Number II

Design Tic-Tac-Toe

Insert into a Sorted Circular Linked List

Nested List Weight Sum

Longest Increasing Subsequence

Strobogrammatic Number

Check Completeness of a Binary Tree

Insert Delete GetRandom O(1)

Inorder Successor in BST

Island Perimeter

Range Sum of BST

Vertical Order Traversal of a Binary Tree

Basic Calculator

Convert Sorted List to Binary Search Tree

Random Pick with Weight

Maximum Subarray

Find Peak Element

Serialize and Deserialize BST

Longest Substring Without Repeating Characters

Diagonal Traverse

Friend Requests I: Overall Acceptance Rate

Roman to Integer

Flatten 2D Vector

Longest Palindromic Substring

Leftmost Column with at Least a One

Custom Sort String

Battleships in a Board

Sliding Window Maximum

Basic Calculator III

String to Integer (atoi)

Number of Islands II

Add Two Numbers

Reorganize String

Smallest Range Covering Elements from K Lists

Insert Delete GetRandom O(1) - Duplicates allowed

Reverse Linked List

Friend Requests II: Who Has the Most Friends

UTF-8 Validation

Wildcard Matching

Group Shifted Strings

Range Sum Query 2D - Mutable

Permutation in String

Minimum Add to Make Parentheses Valid

The Skyline Problem

Find K Closest Elements

All O`one Data Structure

Total Hamming Distance

Palindromic Substrings

Valid Word Abbreviation

Median of Two Sorted Arrays

Validate IP Address

Construct Binary Tree from Preorder and Inorder Traversal

Merge Two Sorted Lists

Kth Smallest Element in a BST

Valid Parenthesis String

Moving Average from Data Stream

Missing Element in Sorted Array

Longest Arithmetic Sequence

Generate Parentheses

Longest Consecutive Sequence

Design Circular Queue

Kth Smallest Element in a Sorted Matrix

Combination Sum

Partition Equal Subset Sum

All Nodes Distance K in Binary Tree

Minimum Depth of Binary Tree

Minimum Knight Moves

Longest Continuous Increasing Subsequence

Reverse Nodes in k-Group

Implement Trie (Prefix Tree)

Binary Tree Level Order Traversal

Max Consecutive Ones III

Robot Room Cleaner

Restore IP Addresses

Find Median from Data Stream

Palindrome Permutation

Reconstruct Itinerary

Construct Binary Tree from String

Longest Increasing Path in a Matrix

Minimum Size Subarray Sum

Toeplitz Matrix

Smallest Subtree with all the Deepest Nodes

Increasing Triplet Subsequence

Design Search Autocomplete System

Minimum Number of Arrows to Burst Balloons

Populating Next Right Pointers in Each Node II

Best Time to Buy and Sell Stock III

Best Time to Buy and Sell Stock II

Search a 2D Matrix II

Lowest Common Ancestor of Deepest Leaves

Implement strStr()

Top K Frequent Elements

Top K Frequent Words

Spiral Matrix III

Max Area of Island

Evaluate Division

Set Matrix Zeroes

Reverse Linked List II

Populating Next Right Pointers in Each Node

Maximum Vacation Days

Sliding Window Median

Course Schedule

Search in Rotated Sorted Array II

Fraction to Recurring Decimal

Single Element in a Sorted Array

Split Array with Equal Sum

Add Bold Tag in String

Number of Distinct Islands

Container With Most Water

Stickers to Spell Word

Lowest Common Ancestor of a Binary Search Tree

Substring with Concatenation of All Words

Serialize and Deserialize N-ary Tree

Largest BST Subtree

Shortest Bridge

Backspace String Compare

Swap Nodes in Pairs

Recover Binary Search Tree

Binary Tree Longest Consecutive Sequence II

Maximum Difference Between Node and Ancestor

Best Meeting Point

Text Justification

Binary Tree Longest Consecutive Sequence

Nested List Weight Sum II

Search a 2D Matrix

Maximal Rectangle

First Unique Character in a String

Sum Root to Leaf Numbers

Binary Tree Postorder Traversal

Valid Palindrome III

Squares of a Sorted Array

Convert a Number to Hexadecimal

Binary Tree Inorder Traversal

Largest Rectangle in Histogram

Minimum Area Rectangle

Closest Binary Search Tree Value II

Similar String Groups

Minimum Area Rectangle II

Second Degree Follower

Remove Duplicates from Sorted Array

Flatten a Multilevel Doubly Linked List

Longest Substring with At Least K Repeating Characters

Word Pattern II

Number of 1 Bits

Next Greater Element III

Number of Connected Components in an Undirected Graph

Max Sum of Rectangle No Larger Than K

First Missing Positive

Add Two Numbers II

Find Pivot Index

Number of Ways to Stay in the Same Place After Some Steps

Maximum Product Subarray

Single Number II

Pancake Sorting

Intersection of Two Linked Lists

Average of Levels in Binary Tree

Koko Eating Bananas

Remove Nth Node From End of List

Closest Leaf in a Binary Tree

Shortest Palindrome

Permutations II

Strobogrammatic Number III

Web Crawler Multithreaded

Peeking Iterator

Remove Duplicate Letters

Integer to Roman

Combination Sum II

Longest Absolute File Path

Data Stream as Disjoint Intervals

Longest Common Prefix

User Activity for the Past 30 Days II

String Compression

Reported Posts II

Find Minimum in Rotated Sorted Array

Find Largest Value in Each Tree Row

Intersection of Three Sorted Arrays

Construct Binary Search Tree from Preorder Traversal

Unique Paths II

Convert Sorted Array to Binary Search Tree

Find the Closest Palindrome

Increasing Subsequences

Remove Sub-Folders from the Filesystem

Reverse Words in a String

Page Recommendations

Knight Probability in Chessboard

Diagonal Traverse II

Reverse Integer

Two Sum II - Input array is sorted

Trapping Rain Water II

Evaluate Reverse Polish Notation

Stream of Characters

Reverse Vowels of a String

Kth Largest Element in a Stream

Find All Duplicates in an Array

Shortest Subarray with Sum at Least K

Range Sum Query - Immutable

Non-overlapping Intervals

Balanced Binary Tree

Shortest Path in Binary Matrix

Making A Large Island

Valid Tic-Tac-Toe State

Shuffle an Array

Peak Index in a Mountain Array

Maximum Sum Circular Subarray

Maximum Depth of Binary Tree

Repeated String Match

Generate Random Point in a Circle

Stamping The Sequence

Design Circular Deque

Excel Sheet Column Number

Combination Sum IV

Permutation Sequence

Maximum Width of Binary Tree

Linked List Random Node

Count Different Palindromic Subsequences

Third Maximum Number

Employee Free Time

Minimum Cost For Tickets

Delete Node in a BST

Course Schedule II

Equal Tree Partition

Palindrome Linked List

Arithmetic Slices II - Subsequence

Find Duplicate File in System

Excel Sheet Column Title

Range Sum Query - Mutable

Best Time to Buy and Sell Stock IV

Print Binary Tree

Maximum Binary Tree

Longest Substring with At Most Two Distinct Characters

Different Ways to Add Parentheses

Number Of Corner Rectangles

Longest Palindromic Subsequence

Pacific Atlantic Water Flow

Trim a Binary Search Tree

Split Array Largest Sum

Graph Valid Tree

ZigZag Conversion

Next Greater Element II

Previous Permutation With One Swap

Count of Smaller Numbers After Self

Uncommon Words from Two Sentences

Sum of Two Integers

Get Highest Answer Rate Question

Best Time to Buy and Sell Stock with Transaction Fee

Possible Bipartition

Next Greater Element I

Next Closest Time

Binary Tree Zigzag Level Order Traversal

Time Based Key-Value Store

Construct Binary Tree from Preorder and Postorder Traversal

Palindrome Number

Surrounded Regions

Odd Even Linked List

Arithmetic Slices

Encode and Decode TinyURL

Construct Binary Tree from Inorder and Postorder Traversal

Find K Pairs with Smallest Sums

Implement Magic Dictionary

Unique Binary Search Trees II

Factorial Trailing Zeroes

Second Highest Salary

Count Univalue Subtrees

Remove All Adjacent Duplicates in String II

Partition Array for Maximum Sum

Invert Binary Tree

Hamming Distance

Subtree of Another Tree

Count Complete Tree Nodes

Shifting Letters

Find the Kth Smallest Sum of a Matrix With Sorted Rows

Contiguous Array

Find Winner on a Tic Tac Toe Game

Remove All Adjacent Duplicates In String

Number of Matching Subsequences

Employees Earning More Than Their Managers

Perfect Squares

Vowel Spellchecker

Climbing Stairs

Pascal's Triangle

Find a Corresponding Node of a Binary Tree in a Clone of That Tree

Number of Ways to Paint N × 3 Grid

Remove K Digits

Linked List Cycle

Maximum Product of Three Numbers

User Activity for the Past 30 Days I

Spiral Matrix II

Shortest Distance to a Character

Longest Repeating Substring

Project Employees III

Number of Comments per Post

Find Duplicate Subtrees

Minimum Number of K Consecutive Bit Flips

Defanging an IP Address

Find the Duplicate Number

Next Greater Node In Linked List

Game Play Analysis IV

Maximum Width Ramp

Partition to K Equal Sum Subsets

Number of Longest Increasing Subsequence

Check If Word Is Valid After Substitutions

Number of Closed Islands

Shortest Way to Form String

Swim in Rising Water

Majority Element II

Cheapest Flights Within K Stops

Element Appearing More Than 25% In Sorted Array

Find the Town Judge

Number of Atoms

Fibonacci Number

Concatenated Words

Design Snake Game

Apples & Oranges

Contains Duplicate

All Elements in Two Binary Search Trees

Distribute Coins in Binary Tree

Remove Duplicates from Sorted List

Two Sum IV - Input is a BST

Minimum Height Trees

Remove Linked List Elements

Isomorphic Strings

Number of Subsequences That Satisfy the Given Sum Condition

Valid Triangle Number

Path with Maximum Gold

Single Number III

Daily Temperatures

Queue Reconstruction by Height

Leaf-Similar Trees

Cousins in Binary Tree

House Robber III

Sort Array By Parity

Maximum Sum of Two Non-Overlapping Subarrays

Maximum Length of Pair Chain

Wiggle Subsequence

Unique Binary Search Trees

Insert into a Binary Search Tree

Best Time to Buy and Sell Stock with Cooldown

Number of Days Between Two Dates

Find Minimum in Rotated Sorted Array II

Remove Duplicates from Sorted Array II

Flipping an Image

Can Place Flowers

Minimum Path Sum

N-th Tribonacci Number

Delete Node in a Linked List

Minimum Time Visiting All Points

Remove Outermost Parentheses

Jewels and Stones

Find N Unique Integers Sum up to Zero

Sum of Left Leaves

Sort Characters By Frequency

Longest Common Subsequence

Partition Labels

Prefix and Suffix Search

Largest Plus Sign

Letter Case Permutation

Minimum Swaps To Make Sequences Increasing

Groups of Special-Equivalent Strings

Binary Tree Cameras

Add to Array-Form of Integer

Maximum Binary Tree II

Moving Stones Until Consecutive

Moving Stones Until Consecutive II

Project Employees I

Project Employees II

Validate Binary Tree Nodes

Queries Quality and Percentage

Report Contiguous Dates

Ads Performance

Apply Discount Every n Orders

Customers Who Bought Products A and B but Not C

Minimum Time to Collect All Apples in a Tree

Make Two Arrays Equal by Reversing Sub-arrays

Maximum Number of Darts Inside of a Circular Dartboard

Diameter of N-Ary Tree

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