Vis
Code
Hash Table
Constant-time lookups to trade space for time.
1.
Two Sum
Easy
217.
Contains Duplicate
Easy
268.
Missing Number
Easy
133.
Clone Graph
Medium
128.
Longest Consecutive Sequence
Medium
141.
Linked List Cycle
Easy
73.
Set Matrix Zeroes
Medium
3.
Longest Substring Without Repeating Characters
Medium
76.
Minimum Window Substring
Hard
242.
Valid Anagram
Easy
49.
Group Anagrams
Medium
105.
Construct Binary Tree from Preorder and Inorder Traversal
Medium
169.
Majority Element
Easy
383.
Ransom Note
Easy
409.
Longest Palindrome
Easy
721.
Accounts Merge
Medium
981.
Time Based Key-Value Store
Medium
17.
Letter Combinations of a Phone Number
Medium
146.
LRU Cache
Medium
438.
Find All Anagrams in a String
Medium
621.
Task Scheduler
Medium
127.
Word Ladder
Hard
347.
Top K Frequent Elements
Medium
36.
Valid Sudoku
Medium
567.
Permutation in String
Medium
138.
Copy List with Random Pointer
Medium
355.
Design Twitter
Medium
846.
Hand of Straights
Medium
202.
Happy Number
Easy
2013.
Detect Squares
Medium