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Companies
Apple
Hash Table
Hash Table
0/51 solved
Two Sum
EASY
Longest Substring Without Repeating Characters
MEDIUM
LRU Cache
MEDIUM
Majority Element
EASY
Group Anagrams
MEDIUM
Letter Combinations of a Phone Number
MEDIUM
Minimum Window Substring
HARD
Top K Frequent Elements
MEDIUM
First Missing Positive
HARD
Linked List Cycle
EASY
Intersection of Two Linked Lists
EASY
Roman to Integer
EASY
Set Matrix Zeroes
MEDIUM
Linked List Cycle II
MEDIUM
Missing Number
EASY
Valid Anagram
EASY
Find All Anagrams in a String
MEDIUM
Contains Duplicate
EASY
Word Ladder
HARD
Implement Trie (Prefix Tree)
MEDIUM
Valid Sudoku
MEDIUM
Happy Number
EASY
Sudoku Solver
HARD
Clone Graph
MEDIUM
Isomorphic Strings
EASY
First Unique Character in a String
EASY
Vertical Order Traversal of a Binary Tree
HARD
Top K Frequent Words
MEDIUM
Integer to Roman
MEDIUM
Word Pattern
EASY
Intersection of Two Arrays
EASY
Number of Good Pairs
EASY
Unique Number of Occurrences
EASY
Design HashMap
EASY
Jewels and Stones
EASY
Minimum Deletions to Make Character Frequencies Unique
MEDIUM
Time Based Key-Value Store
MEDIUM
Set Mismatch
EASY
Find Common Characters
EASY
Max Points on a Line
HARD
Hand of Straights
MEDIUM
Relative Sort Array
EASY
Longest Harmonious Subsequence
EASY
Design Tic-Tac-Toe
MEDIUM
Substring with Concatenation of All Words
HARD
Logger Rate Limiter
EASY
N-Repeated Element in Size 2N Array
EASY
Dot Product of Two Sparse Vectors
MEDIUM
Sparse Matrix Multiplication
MEDIUM
Number of Squareful Arrays
HARD
Circular Array Loop
MEDIUM