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Hash Table
Hash Table
0/92 solved
Two Sum
EASY
Longest Substring Without Repeating Characters
MEDIUM
Subarray Sum Equals K
MEDIUM
LRU Cache
MEDIUM
Longest Consecutive Sequence
MEDIUM
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
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
Valid Sudoku
MEDIUM
Task Scheduler
MEDIUM
Find All Duplicates in an Array
MEDIUM
Sudoku Solver
HARD
Clone Graph
MEDIUM
Insert Delete GetRandom O(1)
MEDIUM
First Unique Character in a String
EASY
Reorganize String
MEDIUM
Sort Characters By Frequency
MEDIUM
Contiguous Array
MEDIUM
Vertical Order Traversal of a Binary Tree
HARD
Intersection of Two Arrays II
EASY
Top K Frequent Words
MEDIUM
Subarray Sums Divisible by K
MEDIUM
Word Break II
HARD
Accounts Merge
MEDIUM
Contains Duplicate II
EASY
Continuous Subarray Sum
MEDIUM
Longest Substring with At Least K Repeating Characters
MEDIUM
Intersection of Two Arrays
EASY
Word Ladder II
HARD
Verifying an Alien Dictionary
EASY
Open the Lock
MEDIUM
Longest Arithmetic Subsequence
MEDIUM
Delete Nodes And Return Forest
MEDIUM
Palindrome Pairs
HARD
Minimum Time to Collect All Apples in a Tree
MEDIUM
Custom Sort String
MEDIUM
Binary Tree Vertical Order Traversal
MEDIUM
Sliding Window Median
HARD
Buddy Strings
EASY
Longest Substring with At Most K Distinct Characters
MEDIUM
Smallest Subtree with all the Deepest Nodes
MEDIUM
Similar String Groups
HARD
Insert Delete GetRandom O(1) - Duplicates allowed
HARD
Prefix and Suffix Search
HARD
Number of Distinct Islands
MEDIUM
Rank Transform of an Array
EASY
Longest Substring with At Most Two Distinct Characters
MEDIUM
Fraction to Recurring Decimal
MEDIUM
Design Tic-Tac-Toe
MEDIUM
Maximum Size Subarray Sum Equals k
MEDIUM
Minimum Area Rectangle
MEDIUM
Longest Word in Dictionary
MEDIUM
Lowest Common Ancestor of Deepest Leaves
MEDIUM
Uncommon Words from Two Sentences
EASY
Group Shifted Strings
MEDIUM
Sum of Unique Elements
EASY
Find Winner on a Tic Tac Toe Game
EASY
Lowest Common Ancestor of a Binary Tree III
MEDIUM
Random Pick Index
MEDIUM
Dot Product of Two Sparse Vectors
MEDIUM
Maximum Number of Occurrences of a Substring
MEDIUM
Check if One String Swap Can Make Strings Equal
EASY
Add Bold Tag in String
MEDIUM
Sparse Matrix Multiplication
MEDIUM
Palindrome Permutation
EASY
Rearrange String k Distance Apart
HARD
Escape a Large Maze
HARD
Intersection of Three Sorted Arrays
EASY
Strobogrammatic Number
EASY
Groups of Special-Equivalent Strings
MEDIUM
Vowel Spellchecker
MEDIUM
Path Sum IV
MEDIUM
Split Array with Equal Sum
HARD
Unique Word Abbreviation
MEDIUM
Apply Discount Every n Orders
MEDIUM
Sentence Similarity
EASY