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Apple

Previous Year Questions

Add Two Numbers

Peeking Iterator

Median of Two Sorted Arrays

Maximum Subarray

Flatten Nested List Iterator

Trapping Rain Water

Perfect Rectangle

Reverse Linked List

Find Median from Data Stream

Number of Islands

Longest Palindromic Substring

The Skyline Problem

Find in Mountain Array

Interleaving String

Largest Palindrome Product

UTF-8 Validation

Product of Array Except Self

Sparse Matrix Multiplication

String to Integer (atoi)

Serialize and Deserialize N-ary Tree

Design Tic-Tac-Toe

Merge Intervals

Longest Increasing Path in a Matrix

Merge k Sorted Lists

Longest Substring Without Repeating Characters

Merge Two Sorted Lists

Android Unlock Patterns

Valid Parentheses

Alien Dictionary

Max Points on a Line

Search in Rotated Sorted Array

Reverse Integer

Letter Combinations of a Phone Number

Basic Calculator II

Best Time to Buy and Sell Stock

Concatenated Words

First Unique Character in a String

Knight Probability in Chessboard

Zigzag Iterator

Insert Delete GetRandom O(1)

Integer to Roman

Boundary of Binary Tree

Serialize and Deserialize Binary Tree

Lowest Common Ancestor of a Binary Tree

Valid Palindrome

Flatten 2D Vector

Number of 1 Bits

Longest Common Prefix

Next Permutation

Jewels and Stones

Find Pivot Index

Palindrome Pairs

Nth Highest Salary

Meeting Rooms II

Integer to English Words

Rectangle Overlap

Meeting Scheduler

Roman to Integer

Combine Two Tables

Battleships in a Board

Snakes and Ladders

Time Based Key-Value Store

Perfect Squares

Copy List with Random Pointer

Longest Absolute File Path

Excel Sheet Column Title

Merge Sorted Array

Linked List Cycle

Find Duplicate File in System

Number of Distinct Islands

Binary Tree Level Order Traversal

Minimum Window Substring

Spiral Matrix II

Number of Digit One

Largest BST Subtree

Longest Valid Parentheses

Shuffle an Array

Top K Frequent Words

Regular Expression Matching

Swap Nodes in Pairs

Reconstruct Itinerary

Valid Phone Numbers

Find First and Last Position of Element in Sorted Array

Text Justification

Implement Queue using Stacks

Excel Sheet Column Number

Longest Increasing Subsequence

Sliding Window Maximum

Island Perimeter

Number of Squareful Arrays

K Closest Points to Origin

Combination Sum

First Missing Positive

Design Hit Counter

Container With Most Water

Predict the Winner

Count of Smaller Numbers After Self

Repeated DNA Sequences

String Compression

Generate Parentheses

Remove Duplicate Letters

Maximum Frequency Stack

Find the Celebrity

Two Sum II - Input array is sorted

Find K Closest Elements

Insert Delete GetRandom O(1) - Duplicates allowed

Reverse Linked List II

Exclusive Time of Functions

Fibonacci Number

Compare Version Numbers

Implement strStr()

Delete Node in a Linked List

Maximum Depth of Binary Tree

Diagonal Traverse

Kth Largest Element in an Array

Design Snake Game

Palindrome Number

Interval List Intersections

Majority Element II

Convert Sorted Array to Binary Search Tree

Binary Tree Maximum Path Sum

ZigZag Conversion

Majority Element

Contains Duplicate III

Diameter of Binary Tree

Reverse Words in a String III

Intersection of Two Arrays

Binary Search Tree Iterator

Reverse Nodes in k-Group

Binary Tree Longest Consecutive Sequence II

Palindrome Linked List

Search a 2D Matrix II

Online Election

Search a 2D Matrix

Palindrome Partitioning III

Reverse Words in a String

Multiply Strings

Second Highest Salary

Random Pick with Weight

Design Search Autocomplete System

Shortest Distance to a Character

Divide Two Integers

Palindromic Substrings

Smallest Range Covering Elements from K Lists

Implement Rand10() Using Rand7()

Insert Interval

Daily Temperatures

Remove Duplicates from Sorted List

Substring with Concatenation of All Words

Populating Next Right Pointers in Each Node

Defanging an IP Address

Longest Univalue Path

Longest Consecutive Sequence

Construct Quad Tree

Longest Duplicate Substring

Binary Tree Right Side View

Split a String in Balanced Strings

Squares of a Sorted Array

Pascal's Triangle

Climbing Stairs

Logger Rate Limiter

Intersection of Two Arrays II

Add and Search Word - Data structure design

Transpose Matrix

Restore IP Addresses

Department Highest Salary

Remove Duplicates from Sorted List II

Delete Node in a BST

Contains Duplicate II

Flatten Binary Tree to Linked List

Trapping Rain Water II

Find All Numbers Disappeared in an Array

Subarray Sum Equals K

Minimum Moves to Equal Array Elements

Partition Equal Subset Sum

Pacific Atlantic Water Flow

Find Peak Element

Kth Smallest Element in a BST

Course Schedule

Scramble String

Palindrome Permutation

Expression Add Operators

Design Circular Queue

Construct Binary Tree from Preorder and Inorder Traversal

Validate Binary Search Tree

Find the Duplicate Number

Reverse Vowels of a String

Set Matrix Zeroes

Remove Duplicates from Sorted Array

Implement Trie (Prefix Tree)

Consecutive Numbers

Linked List Cycle II

Non-overlapping Intervals

Single Element in a Sorted Array

Add Two Numbers II

Trim a Binary Search Tree

Sliding Window Median

Find Largest Value in Each Tree Row

Remove Nth Node From End of List

Find Minimum in Rotated Sorted Array

Merge Two Binary Trees

Search Insert Position

Find All Duplicates in an Array

Kth Smallest Element in a Sorted Matrix

Best Time to Buy and Sell Stock III

Capacity To Ship Packages Within D Days

All Nodes Distance K in Binary Tree

Binary Tree Inorder Traversal

Best Time to Buy and Sell Stock II

Unique Binary Search Trees II

Basic Calculator III

Balanced Binary Tree

Find Common Characters

Binary Tree Zigzag Level Order Traversal

Array Partition I

Minimum Falling Path Sum

Find and Replace Pattern

Remove Invalid Parentheses

Sum of Two Integers

Range Sum Query 2D - Immutable

Longest Harmonious Subsequence

Unique Paths II

Sum of Nodes with Even-Valued Grandparent

Find Winner on a Tic Tac Toe Game

Reorganize String

Max Area of Island

Fraction to Recurring Decimal

Top K Frequent Elements

Longest Continuous Increasing Subsequence

Flatten a Multilevel Doubly Linked List

Sum of Subarray Minimums

Missing Element in Sorted Array

Permutations II

Course Schedule II

Combination Sum II

Minimum Path Sum

Remove Outermost Parentheses

Guess Number Higher or Lower

Possible Bipartition

Invert Binary Tree

Contains Duplicate

Longest Palindromic Subsequence

Kth Largest Element in a Stream

Minimum Absolute Difference in BST

Middle of the Linked List

Minimum Knight Moves

Range Sum of BST

Subdomain Visit Count

Find K Pairs with Smallest Sums

Minimum Depth of Binary Tree

N-Repeated Element in Size 2N Array

Binary Search Tree to Greater Sum Tree

Minimum Height Trees

Unique Morse Code Words

Walls and Gates

Toeplitz Matrix

Sort Array By Parity

Permutation Sequence

Contiguous Array

Search in a Binary Search Tree

Minimum Size Subarray Sum

Queue Reconstruction by Height

Maximum Product of Three Numbers

Best Time to Buy and Sell Stock IV

Remove Linked List Elements

Binary Tree Level Order Traversal II

Employees Earning More Than Their Managers

Binary Tree Paths

Most Common Word

Unique Binary Search Trees

Reorder Data in Log Files

Partition Labels

Single Number III

Best Time to Buy and Sell Stock with Cooldown

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