Amazon Array Problems | PrepFlow | PrepFlow

Array

Overall Progress0/326(0%)

Easy

1/70

Medium

0/190

Hard

0/66

Easy

Maximum Subarray

Medium

Trapping Rain Water

Hard

Best Time to Buy and Sell Stock

Easy

Medium

Container With Most Water

Medium

Median of Two Sorted Arrays

Hard

Search in Rotated Sorted Array

Medium

Find the Duplicate Number

Medium

Product of Array Except Self

Medium

Number of Islands

Medium

Merge Intervals

Medium

Subarray Sum Equals K

Medium

Medium

Longest Increasing Subsequence

Medium

Find First and Last Position of Element in Sorted Array

Medium

Longest Consecutive Sequence

Medium

Majority Element

Easy

Medium

Medium

Medium

Medium

Combination Sum

Medium

Medium

Next Permutation

Medium

Maximum Product Subarray

Medium

Medium

Sliding Window Maximum

Hard

Medium

Top K Frequent Elements

Medium

Medium

Largest Rectangle in Histogram

Hard

Medium

Kth Largest Element in an Array

Medium

Easy

First Missing Positive

Hard

Easy

Search Insert Position

Easy

Search a 2D Matrix

Medium

Medium

Merge Sorted Array

Easy

Remove Duplicates from Sorted Array

Easy

Construct Binary Tree from Preorder and Inorder Traversal

Medium

Medium

Set Matrix Zeroes

Medium

Medium

Best Time to Buy and Sell Stock II

Medium

Find Minimum in Rotated Sorted Array

Medium

Daily Temperatures

Medium

Rotting Oranges

Medium

Pascal's Triangle

Easy

Minimum Size Subarray Sum

Medium

Hard

Minimum Path Sum

Medium

Find Peak Element

Medium

Easy

Partition Equal Subset Sum

Medium

Medium

Easy

Search a 2D Matrix II

Medium

Two Sum II - Input Array Is Sorted

Medium

Medium

Min Cost Climbing Stairs

Easy

Single Element in a Sorted Array

Medium

Koko Eating Bananas

Medium

Combination Sum II

Medium

Convert Sorted Array to Binary Search Tree

Easy

Medium

Medium

Maximal Rectangle

Hard

Medium

Insert Interval

Medium

Medium

Find All Duplicates in an Array

Medium

Medium

House Robber II

Medium

Split Array Largest Sum

Hard

Max Area of Island

Medium

Kth Smallest Element in a Sorted Matrix

Medium

Medium

Best Time to Buy and Sell Stock III

Hard

Hard

Capacity To Ship Packages Within D Days

Medium

Easy

Medium

Medium

Hard

Find All Numbers Disappeared in an Array

Easy

Best Time to Buy and Sell Stock with Cooldown

Medium

Evaluate Division

Medium

Squares of a Sorted Array

Easy

Insert Delete GetRandom O(1)

Medium

Hard

Longest Increasing Path in a Matrix

Hard

Unique Paths II

Medium

Medium

Surrounded Regions

Medium

Count of Smaller Numbers After Self

Hard

Search in Rotated Sorted Array II

Medium

Permutations II

Medium

Easy

K Closest Points to Origin

Medium

Next Greater Element I

Easy

Non-overlapping Intervals

Medium

Asteroid Collision

Medium

Next Greater Element II

Medium

Hard

Contiguous Array

Medium

Medium

Running Sum of 1d Array

Easy

Evaluate Reverse Polish Notation

Medium

Shortest Unsorted Continuous Subarray

Medium

Intersection of Two Arrays II

Easy

Pacific Atlantic Water Flow

Medium

Best Time to Buy and Sell Stock IV

Hard

Medium

Hard

Best Time to Buy and Sell Stock with Transaction Fee

Medium

Partition to K Equal Sum Subsets

Medium

Meeting Rooms II

Medium

Medium

Kth Missing Positive Number

Easy

Maximum Profit in Job Scheduling

Hard

Number of Longest Increasing Subsequence

Medium

Maximum Length of Repeated Subarray

Medium

Maximum Sum Circular Subarray

Medium

Shortest Path in Binary Matrix

Medium

Find the Town Judge

Easy

Minimum Falling Path Sum

Medium

Medium

Contains Duplicate II

Easy

Find K Pairs with Smallest Sums

Medium

Continuous Subarray Sum

Medium

Hard

Construct Binary Search Tree from Preorder Traversal

Medium

Intersection of Two Arrays

Easy

Subarrays with K Different Integers

Hard

Last Stone Weight

Easy

Combination Sum III

Medium

Russian Doll Envelopes

Hard

Path With Minimum Effort

Medium

Largest Divisible Subset

Medium

Max Consecutive Ones

Easy

The Skyline Problem

Hard

Predict the Winner

Medium

Hard

Interval List Intersections

Medium

How Many Numbers Are Smaller Than the Current Number

Easy

Number of Good Pairs

Easy

Arithmetic Slices

Medium

Count Square Submatrices with All Ones

Medium

Unique Paths III

Hard

Easy

Range Sum Query 2D - Immutable

Medium

Count Negative Numbers in a Sorted Matrix

Easy

Medium

Pascal's Triangle II

Easy

Verifying an Alien Dictionary

Easy

Medium

Easy

Search Suggestions System

Medium

Partition Array for Maximum Sum

Medium

Find Minimum in Rotated Sorted Array II

Hard

Medium

Maximum Length of Pair Chain

Medium

Delete Nodes And Return Forest

Medium

Shortest Path in a Grid with Obstacles Elimination

Hard

Number of Closed Islands

Medium

Palindrome Pairs

Hard

Alien Dictionary

Hard

Hard

Find Common Characters

Easy

Minimum Cost Tree From Leaf Values

Medium

Maximum Product of Three Numbers

Easy

Max Points on a Line

Hard

Pairs of Songs With Total Durations Divisible by 60

Medium

The K Weakest Rows in a Matrix

Easy

Easy

Smallest Range Covering Elements from K Lists

Hard

Making A Large Island

Hard

K-diff Pairs in an Array

Medium

Concatenated Words

Hard

Text Justification

Hard

Hard

Matchsticks to Square

Medium

Maximum Units on a Truck

Easy

Uncrossed Lines

Medium

Trapping Rain Water II

Hard

Hard

Find K-th Smallest Pair Distance

Hard

Maximum Average Subarray I

Easy

Design Circular Queue

Medium

Diagonal Traverse

Medium

Reveal Cards In Increasing Order

Medium

Sort Array by Increasing Frequency

Easy

Minimum Difficulty of a Job Schedule

Hard

Count Number of Teams

Medium

Medium

Next Greater Node In Linked List

Medium

Sliding Window Median

Hard

Maximize Distance to Closest Person

Medium

Easy

Relative Sort Array

Easy

Walls and Gates

Medium

Maximum Performance of a Team

Hard

Medium

Snakes and Ladders

Medium

Easy

Longest Mountain in Array

Medium

Construct Binary Tree from Preorder and Postorder Traversal

Medium

Medium

Replace Elements with Greatest Element on Right Side

Easy

Sort Array By Parity II

Easy

Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts

Medium

Maximum Sum of Two Non-Overlapping Subarrays

Medium

Filling Bookcase Shelves

Medium

Maximum Score from Performing Multiplication Operations

Hard

Minimum Cost to Merge Stones

Hard

Most Profit Assigning Work

Medium

Make Sum Divisible by P

Medium

Longest Continuous Increasing Subsequence

Easy

Count of Range Sum

Hard

Hard

Score After Flipping Matrix

Medium

Shortest Subarray to be Removed to Make Array Sorted

Medium

Prefix and Suffix Search

Hard

Least Number of Unique Integers after K Removals

Medium

Design a Stack With Increment Operation

Medium

Rank Transform of an Array

Easy

Remove Covered Intervals

Medium

Average Salary Excluding the Minimum and Maximum Salary

Easy

Minimum Time Visiting All Points

Easy

Super Ugly Number

Medium

Can Make Arithmetic Progression From Sequence

Easy

Find Words That Can Be Formed by Characters

Easy

Reorder Data in Log Files

Medium

Largest Sum of Averages

Medium

Maximum Number of Events That Can Be Attended II

Hard

Design Tic-Tac-Toe

Medium

Find the Most Competitive Subsequence

Medium

Easy

Design Hit Counter

Medium

Length of Longest Fibonacci Subsequence

Medium

XOR Queries of a Subarray

Medium

Minimum Area Rectangle

Medium

Longest Turbulent Subarray

Medium

Random Pick with Weight

Medium

Exclusive Time of Functions

Medium

Medium

Employee Free Time

Hard

Minimum Number of K Consecutive Bit Flips

Hard

Shortest Distance from All Buildings

Hard

Number of Islands II

Hard

Peeking Iterator

Medium

Medium

Video Stitching

Medium

Easy

Most Common Word

Easy

Partition Array Into Three Parts With Equal Sum

Easy

Moving Average from Data Stream

Easy

Maximize Score After N Operations

Hard

Design Circular Deque

Medium

Maximize Sum Of Array After K Negations

Easy

Find Duplicate File in System

Medium

Prison Cells After N Days

Medium

Bitwise ORs of Subarrays

Medium

Hard

Find the Shortest Superstring

Hard

Maximum Number of Achievable Transfer Requests

Hard

Numbers At Most N Given Digit Set

Hard

Medium

Maximum Average Pass Ratio

Medium

Medium

Minimum Cost to Connect Sticks

Medium

Count Servers that Communicate

Medium

Decompress Run-Length Encoded List

Easy

Cut Off Trees for Golf Event

Hard

Best Meeting Point

Hard

Detect Cycles in 2D Grid

Medium

Two Sum Less Than K

Easy

Easy

Sell Diminishing-Valued Colored Balls

Medium

Find Minimum Time to Finish All Jobs

Hard

Shortest Word Distance II

Medium

Medium

Design Snake Game

Medium

Camelcase Matching

Medium

Meeting Scheduler

Medium

Cinema Seat Allocation

Medium

UTF-8 Validation

Medium

String Matching in an Array

Easy

1-bit and 2-bit Characters

Easy

Find Nearest Point That Has the Same X or Y Coordinate

Easy

Sentence Similarity II

Medium

Super Washing Machines

Hard

Decode XORed Permutation

Medium

Easy

Design Front Middle Back Queue

Medium

Coloring A Border

Medium

Largest 1-Bordered Square

Medium

Number of Equivalent Domino Pairs

Easy

Falling Squares

Hard

Minimum Numbers of Function Calls to Make Target Array

Medium

Largest Multiple of Three

Hard

Maximum Number of Visible Points

Hard

First Unique Number

Medium

Valid Tic-Tac-Toe State

Medium

Design an Expression Tree With Evaluate Function

Medium

Analyze User Website Visit Pattern

Medium

Queries on a Permutation With Key

Medium

Design Compressed String Iterator

Easy

Vowel Spellchecker

Medium

Get Watched Videos by Your Friends

Medium

Hard

Optimal Division

Medium

Index Pairs of a String

Easy

Synonymous Sentences

Medium

Largest Unique Number

Easy

Form Array by Concatenating Subarrays of Another Array

Medium

Filter Restaurants by Vegan-Friendly, Price and Distance

Medium

Count Ways to Make Array With Product

Hard

Find the Index of the Large Integer

Medium

Diet Plan Performance

Easy

Sum of Digits in the Minimum Number

Easy

Sort Features by Popularity

Medium

Maximize the Beauty of the Garden

Hard