Amazon Hash Table Problems | PrepFlow | PrepFlow

Hash Table

Overall Progress0/134(0%)

Easy

1/33

Medium

0/77

Hard

0/24

Easy

Longest Substring Without Repeating Characters

Medium

Subarray Sum Equals K

Medium

Medium

Longest Consecutive Sequence

Medium

Majority Element

Easy

Medium

Letter Combinations of a Phone Number

Medium

Minimum Window Substring

Hard

Top K Frequent Elements

Medium

Medium

First Missing Positive

Hard

Linked List Cycle

Easy

Construct Binary Tree from Preorder and Inorder Traversal

Medium

Intersection of Two Linked Lists

Easy

Roman to Integer

Easy

Set Matrix Zeroes

Medium

Copy List with Random Pointer

Medium

Linked List Cycle II

Medium

Easy

Easy

Find All Anagrams in a String

Medium

Hard

Permutation in String

Medium

Implement Trie (Prefix Tree)

Medium

All Nodes Distance K in Binary Tree

Medium

Longest Repeating Character Replacement

Medium

Medium

Medium

Find All Duplicates in an Array

Medium

Partition Labels

Medium

Hard

Medium

Find All Numbers Disappeared in an Array

Easy

Insert Delete GetRandom O(1)

Medium

Isomorphic Strings

Easy

First Unique Character in a String

Easy

Reorganize String

Medium

Sort Characters By Frequency

Medium

Next Greater Element I

Easy

Contiguous Array

Medium

Vertical Order Traversal of a Binary Tree

Hard

Intersection of Two Arrays II

Easy

Top K Frequent Words

Medium

Integer to Roman

Medium

Hard

Medium

Find the Town Judge

Easy

Medium

Contains Duplicate II

Easy

Continuous Subarray Sum

Medium

Intersection of Two Arrays

Easy

Subarrays with K Different Integers

Hard

Hard

Find Duplicate Subtrees

Medium

Hard

How Many Numbers Are Smaller Than the Current Number

Easy

Number of Good Pairs

Easy

Easy

Easy

Find the Difference

Easy

Minimum Deletions to Make Character Frequencies Unique

Medium

Medium

Verifying an Alien Dictionary

Easy

Medium

Easy

Maximum Frequency Stack

Hard

Delete Nodes And Return Forest

Medium

Palindrome Pairs

Hard

Hard

Find Common Characters

Easy

Max Points on a Line

Hard

Pairs of Songs With Total Durations Divisible by 60

Medium

Medium

Smallest Range Covering Elements from K Lists

Hard

K-diff Pairs in an Array

Medium

Hard

Sort Array by Increasing Frequency

Easy

Repeated DNA Sequences

Medium

Remove Zero Sum Consecutive Nodes from Linked List

Medium

Binary Tree Vertical Order Traversal

Medium

Sliding Window Median

Hard

Relative Sort Array

Easy

Minimum Genetic Mutation

Medium

Construct Binary Tree from Preorder and Postorder Traversal

Medium

Medium

Make Sum Divisible by P

Medium

Prefix and Suffix Search

Hard

Most Frequent Subtree Sum

Medium

Least Number of Unique Integers after K Removals

Medium

Number of Distinct Islands

Medium

Rank Transform of an Array

Easy

Find Words That Can Be Formed by Characters

Easy

Design Tic-Tac-Toe

Medium

All O`one Data Structure

Hard

Encode and Decode TinyURL

Medium

Length of Longest Fibonacci Subsequence

Medium

Substring with Concatenation of All Words

Hard

Minimum Area Rectangle

Medium

Number of Atoms

Hard

Number of Islands II

Hard

Uncommon Words from Two Sentences

Easy

Logger Rate Limiter

Easy

Most Common Word

Easy

Find Duplicate File in System

Medium

Prison Cells After N Days

Medium

Design In-Memory File System

Hard

Easy

Lowest Common Ancestor of a Binary Tree III

Medium

Shortest Word Distance II

Medium

Swap For Longest Repeated Character Substring

Medium

Design Snake Game

Medium

Word Pattern II

Medium

Cinema Seat Allocation

Medium

Alphabet Board Path

Medium

Sentence Similarity II

Medium

Next Closest Time

Medium

Number of Equivalent Domino Pairs

Easy

Design File System

Medium

Find K-Length Substrings With No Repeated Characters

Medium

First Unique Number

Medium

Analyze User Website Visit Pattern

Medium

Lowest Common Ancestor of a Binary Tree IV

Medium

Find Distance in a Binary Tree

Medium

Vowel Spellchecker

Medium

Get Watched Videos by Your Friends

Medium

Clone N-ary Tree

Medium

Remove Duplicates From an Unsorted Linked List

Medium

Synonymous Sentences

Medium

Largest Unique Number

Easy

Throne Inheritance

Medium

Number of Distinct Islands II

Hard

Sort Features by Popularity

Medium

Maximize the Beauty of the Garden

Hard