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Hash Table
Hash Table
0/132 solved
Two Sum
EASY
Longest Substring Without Repeating Characters
MEDIUM
Subarray Sum Equals K
MEDIUM
LRU Cache
MEDIUM
Longest Consecutive Sequence
MEDIUM
Majority Element
EASY
Group Anagrams
MEDIUM
Letter Combinations of a Phone Number
MEDIUM
Minimum Window Substring
HARD
Top K Frequent Elements
MEDIUM
Word Break
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
Missing Number
EASY
Valid Anagram
EASY
Find All Anagrams in a String
MEDIUM
Word Ladder
HARD
Permutation in String
MEDIUM
Implement Trie (Prefix Tree)
MEDIUM
All Nodes Distance K in Binary Tree
MEDIUM
Longest Repeating Character Replacement
MEDIUM
Valid Sudoku
MEDIUM
Task Scheduler
MEDIUM
Find All Duplicates in an Array
MEDIUM
Partition Labels
MEDIUM
Sudoku Solver
HARD
Clone Graph
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
Word Break II
HARD
Accounts Merge
MEDIUM
Find the Town Judge
EASY
Ugly Number II
MEDIUM
Contains Duplicate II
EASY
Continuous Subarray Sum
MEDIUM
Intersection of Two Arrays
EASY
Subarrays with K Different Integers
HARD
Word Ladder II
HARD
Find Duplicate Subtrees
MEDIUM
LFU Cache
HARD
How Many Numbers Are Smaller Than the Current Number
EASY
Number of Good Pairs
EASY
Design HashMap
EASY
Ransom Note
EASY
Find the Difference
EASY
Minimum Deletions to Make Character Frequencies Unique
MEDIUM
4Sum II
MEDIUM
Verifying an Alien Dictionary
EASY
Open the Lock
MEDIUM
Set Mismatch
EASY
Maximum Frequency Stack
HARD
Delete Nodes And Return Forest
MEDIUM
Bus Routes
HARD
Find Common Characters
EASY
Max Points on a Line
HARD
Pairs of Songs With Total Durations Divisible by 60
MEDIUM
Smallest Range Covering Elements from K Lists
HARD
Design Twitter
MEDIUM
K-diff Pairs in an Array
MEDIUM
Jump Game IV
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
Word Subsets
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
Path Crossing
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
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