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Easy 0/22
Medium 0/21
Hard 0/5
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Difficulty Title Frequency Acceptance Rate Link Topics
MEDIUM String Compression III 100.0 0.67 View Problem String
HARD Maximum Number of Ones 97.6 0.69 View Problem Math, Greedy, Sorting, Heap (Priority Queue)
EASY Reverse Linked List 91.9 0.79 View Problem Linked List, Recursion
MEDIUM Remove Nth Node From End of List 74.2 0.49 View Problem Linked List, Two Pointers
MEDIUM Rotate Image 74.2 0.78 View Problem Array, Math, Matrix
MEDIUM LRU Cache 74.2 0.45 View Problem Hash Table, Linked List, Design, Doubly-Linked List
MEDIUM Number of Islands 74.2 0.62 View Problem Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
EASY Reverse Bits 74.2 0.63 View Problem Divide and Conquer, Bit Manipulation
EASY Middle of the Linked List 74.2 0.81 View Problem Linked List, Two Pointers
MEDIUM Design Memory Allocator 66.9 0.48 View Problem Array, Hash Table, Design, Simulation
EASY Majority Element 66.9 0.66 View Problem Array, Hash Table, Divide and Conquer, Sorting, Counting
EASY Merge Sorted Array 66.9 0.53 View Problem Array, Two Pointers, Sorting
EASY Two Sum 66.9 0.56 View Problem Array, Hash Table
EASY Valid Parentheses 66.9 0.42 View Problem String, Stack
EASY Implement Queue using Stacks 66.9 0.68 View Problem Stack, Design, Queue
EASY Palindrome Number 66.9 0.59 View Problem Math
EASY Climbing Stairs 66.9 0.54 View Problem Math, Dynamic Programming, Memoization
EASY Number of 1 Bits 66.9 0.75 View Problem Divide and Conquer, Bit Manipulation
MEDIUM Swap Nodes in Pairs 66.9 0.67 View Problem Linked List, Recursion
MEDIUM Design Circular Queue 56.6 0.53 View Problem Array, Linked List, Design, Queue
MEDIUM Permutations 56.6 0.81 View Problem Array, Backtracking
EASY Power of Four 56.6 0.49 View Problem Math, Bit Manipulation, Recursion
HARD Reverse Nodes in k-Group 56.6 0.63 View Problem Linked List, Recursion
MEDIUM Longest Substring Without Repeating Characters 56.6 0.37 View Problem Hash Table, String, Sliding Window
EASY First Unique Character in a String 56.6 0.64 View Problem Hash Table, String, Queue, Counting
HARD Serialize and Deserialize Binary Tree 56.6 0.59 View Problem String, Tree, Depth-First Search, Breadth-First Search, Design, Binary Tree
EASY Is Subsequence 56.6 0.48 View Problem Two Pointers, String, Dynamic Programming
EASY Single Number 56.6 0.76 View Problem Array, Bit Manipulation
EASY Linked List Cycle 56.6 0.53 View Problem Hash Table, Linked List, Two Pointers
MEDIUM Count the Number of Fair Pairs 56.6 0.53 View Problem Array, Two Pointers, Binary Search, Sorting
MEDIUM Kth Largest Element in an Array 56.6 0.68 View Problem Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
HARD Trapping Rain Water 56.6 0.65 View Problem Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack
EASY Rectangle Overlap 56.6 0.46 View Problem Math, Geometry
MEDIUM String to Integer (atoi) 56.6 0.19 View Problem String
EASY Find Winner on a Tic Tac Toe Game 56.6 0.54 View Problem Array, Hash Table, Matrix, Simulation
MEDIUM Course Schedule II 56.6 0.53 View Problem Depth-First Search, Breadth-First Search, Graph, Topological Sort
MEDIUM Reverse Integer 56.6 0.30 View Problem Math
EASY Maximum Depth of Binary Tree 56.6 0.77 View Problem Tree, Depth-First Search, Breadth-First Search, Binary Tree
MEDIUM Two Sum II - Input Array Is Sorted 56.6 0.63 View Problem Array, Two Pointers, Binary Search
MEDIUM Maximum Subarray 56.6 0.52 View Problem Array, Divide and Conquer, Dynamic Programming
MEDIUM Pow(x, n) 56.6 0.37 View Problem Math, Recursion
MEDIUM Design Tic-Tac-Toe 56.6 0.59 View Problem Array, Hash Table, Design, Matrix, Simulation
HARD Trapping Rain Water II 56.6 0.59 View Problem Array, Breadth-First Search, Heap (Priority Queue), Matrix
EASY Power of Two 56.6 0.48 View Problem Math, Bit Manipulation, Recursion
EASY Remove Duplicates from Sorted Array 56.6 0.60 View Problem Array, Two Pointers
EASY Length of Last Word 56.6 0.56 View Problem String
MEDIUM Best Time to Buy and Sell Stock II 56.6 0.70 View Problem Array, Dynamic Programming, Greedy
MEDIUM Merge Intervals 56.6 0.49 View Problem Array, Sorting