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Easy 0/50
Medium 0/45
Hard 0/5
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Difficulty Title Frequency Acceptance Rate Link Topics
EASY Two Sum 84.5 0.56 View Problem Array, Hash Table
EASY Palindrome Number 76.6 0.59 View Problem Math
EASY Majority Element 72.2 0.66 View Problem Array, Hash Table, Divide and Conquer, Sorting, Counting
EASY Best Time to Buy and Sell Stock 68.6 0.55 View Problem Array, Dynamic Programming
MEDIUM Maximum Subarray 66.5 0.52 View Problem Array, Divide and Conquer, Dynamic Programming
EASY Longest Common Prefix 64.1 0.45 View Problem String, Trie
EASY Valid Parentheses 61.4 0.42 View Problem String, Stack
EASY Fibonacci Number 61.4 0.73 View Problem Math, Dynamic Programming, Recursion, Memoization
MEDIUM Subarray Sum Equals K 61.4 0.45 View Problem Array, Hash Table, Prefix Sum
EASY Move Zeroes 61.4 0.63 View Problem Array, Two Pointers
MEDIUM Rotate Array 61.4 0.43 View Problem Array, Math, Two Pointers
EASY Count the Digits That Divide a Number 59.9 0.86 View Problem Math
MEDIUM Jump Game 59.9 0.39 View Problem Array, Dynamic Programming, Greedy
EASY Maximum Ascending Subarray Sum 59.9 0.66 View Problem Array
MEDIUM Reverse Integer 59.9 0.30 View Problem Math
EASY Merge Sorted Array 56.4 0.53 View Problem Array, Two Pointers, Sorting
MEDIUM Unique Paths 56.4 0.66 View Problem Math, Dynamic Programming, Combinatorics
EASY Roman to Integer 56.4 0.65 View Problem Hash Table, Math, String
EASY Remove Letter To Equalize Frequency 56.4 0.18 View Problem Hash Table, String, Counting
EASY Minimum Cuts to Divide a Circle 56.4 0.55 View Problem Math, Geometry
EASY Single Number 56.4 0.76 View Problem Array, Bit Manipulation
EASY Valid Anagram 56.4 0.67 View Problem Hash Table, String, Sorting
EASY Minimum Operations to Exceed Threshold Value I 56.4 0.86 View Problem Array
MEDIUM Minimum Operations to Exceed Threshold Value II 56.4 0.46 View Problem Array, Heap (Priority Queue), Simulation
HARD Palindrome Partitioning IV 56.4 0.45 View Problem String, Dynamic Programming
MEDIUM 3Sum 54.4 0.37 View Problem Array, Two Pointers, Sorting
MEDIUM Bitwise ORs of Subarrays 54.4 0.41 View Problem Array, Dynamic Programming, Bit Manipulation
EASY Climbing Stairs 54.4 0.54 View Problem Math, Dynamic Programming, Memoization
EASY Find the Index of the First Occurrence in a String 54.4 0.45 View Problem Two Pointers, String, String Matching
EASY Remove Duplicates from Sorted Array 52.2 0.60 View Problem Array, Two Pointers
MEDIUM Longest Palindromic Substring 52.2 0.36 View Problem Two Pointers, String, Dynamic Programming
MEDIUM Container With Most Water 49.7 0.58 View Problem Array, Two Pointers, Greedy
EASY Plus One 49.7 0.48 View Problem Array, Math
MEDIUM Pow(x, n) 49.7 0.37 View Problem Math, Recursion
MEDIUM Second Highest Salary 49.7 0.44 View Problem Database
EASY Length of Last Word 49.7 0.56 View Problem String
MEDIUM Sort Colors 49.7 0.68 View Problem Array, Two Pointers, Sorting
HARD Sliding Window Maximum 46.8 0.48 View Problem Array, Queue, Sliding Window, Heap (Priority Queue), Monotonic Queue
EASY Contains Duplicate 46.8 0.63 View Problem Array, Hash Table, Sorting
EASY Happy Number 46.8 0.58 View Problem Hash Table, Math, Two Pointers
MEDIUM Reverse Words in a String 46.8 0.52 View Problem Two Pointers, String
HARD Trapping Rain Water 46.8 0.65 View Problem Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack
MEDIUM Spiral Matrix 46.8 0.54 View Problem Array, Matrix, Simulation
EASY Missing Number 46.8 0.70 View Problem Array, Hash Table, Math, Binary Search, Bit Manipulation, Sorting
MEDIUM Best Time to Buy and Sell Stock II 43.4 0.70 View Problem Array, Dynamic Programming, Greedy
MEDIUM Add Two Numbers 43.4 0.46 View Problem Linked List, Math, Recursion
MEDIUM Set Matrix Zeroes 43.4 0.61 View Problem Array, Hash Table, Matrix
EASY Sqrt(x) 43.4 0.40 View Problem Math, Binary Search
MEDIUM Max Consecutive Ones III 43.4 0.66 View Problem Array, Binary Search, Sliding Window, Prefix Sum
EASY Check if Array Is Sorted and Rotated 43.4 0.55 View Problem Array
MEDIUM Longest Substring Without Repeating Characters 43.4 0.37 View Problem Hash Table, String, Sliding Window
EASY Toeplitz Matrix 43.4 0.69 View Problem Array, Matrix
EASY Merge Two Sorted Lists 43.4 0.67 View Problem Linked List, Recursion
MEDIUM Single Element in a Sorted Array 39.2 0.59 View Problem Array, Binary Search
EASY Fizz Buzz 39.2 0.74 View Problem Math, String, Simulation
EASY Reverse String 39.2 0.80 View Problem Two Pointers, String
EASY N-th Tribonacci Number 39.2 0.64 View Problem Math, Dynamic Programming, Memoization
EASY Add Binary 39.2 0.56 View Problem Math, String, Bit Manipulation, Simulation
MEDIUM K-diff Pairs in an Array 39.2 0.45 View Problem Array, Hash Table, Two Pointers, Binary Search, Sorting
EASY Find Customer Referee 39.2 0.72 View Problem Database
EASY Article Views I 39.2 0.77 View Problem Database
HARD Department Top Three Salaries 39.2 0.58 View Problem Database
MEDIUM 4Sum 39.2 0.38 View Problem Array, Two Pointers, Sorting
EASY Reverse Linked List 39.2 0.79 View Problem Linked List, Recursion
MEDIUM Generate Parentheses 39.2 0.77 View Problem String, Dynamic Programming, Backtracking
EASY Rotate String 33.9 0.64 View Problem String, String Matching
MEDIUM Remove Duplicates from Sorted Array II 33.9 0.63 View Problem Array, Two Pointers
MEDIUM Edit Distance 33.9 0.59 View Problem String, Dynamic Programming
HARD Largest Rectangle in Histogram 33.9 0.47 View Problem Array, Stack, Monotonic Stack
MEDIUM Find First and Last Position of Element in Sorted Array 33.9 0.47 View Problem Array, Binary Search
EASY Binary Search 33.9 0.60 View Problem Array, Binary Search
EASY Same Tree 33.9 0.65 View Problem Tree, Depth-First Search, Breadth-First Search, Binary Tree
EASY Employee Bonus 33.9 0.77 View Problem Database
MEDIUM Longest Common Subsequence 33.9 0.58 View Problem String, Dynamic Programming
EASY Pascal's Triangle 33.9 0.77 View Problem Array, Dynamic Programming
MEDIUM Longest Consecutive Sequence 33.9 0.47 View Problem Array, Hash Table, Union Find
MEDIUM Maximum Product Subarray 33.9 0.35 View Problem Array, Dynamic Programming
EASY Sort Array by Increasing Frequency 33.9 0.80 View Problem Array, Hash Table, Sorting
MEDIUM Largest Number 33.9 0.41 View Problem Array, String, Greedy, Sorting
MEDIUM Sort Characters By Frequency 33.9 0.74 View Problem Hash Table, String, Sorting, Heap (Priority Queue), Bucket Sort, Counting
MEDIUM Next Permutation 33.9 0.43 View Problem Array, Two Pointers
EASY Power of Two 33.9 0.48 View Problem Math, Bit Manipulation, Recursion
MEDIUM Subsets 33.9 0.81 View Problem Array, Backtracking, Bit Manipulation
EASY How Many Numbers Are Smaller Than the Current Number 26.5 0.87 View Problem Array, Hash Table, Sorting, Counting Sort
EASY Students and Examinations 26.5 0.60 View Problem Database
MEDIUM Path with Maximum Probability 26.5 0.65 View Problem Array, Graph, Heap (Priority Queue), Shortest Path
MEDIUM Combination Sum 26.5 0.75 View Problem Array, Backtracking
EASY Sum of Unique Elements 26.5 0.79 View Problem Array, Hash Table, Counting
MEDIUM Search a 2D Matrix II 26.5 0.55 View Problem Array, Binary Search, Divide and Conquer, Matrix
MEDIUM Word Search 26.5 0.45 View Problem Array, String, Backtracking, Depth-First Search, Matrix
MEDIUM Peak Index in a Mountain Array 26.5 0.68 View Problem Array, Binary Search
EASY Number of Employees Who Met the Target 26.5 0.88 View Problem Array
MEDIUM Coin Change 26.5 0.46 View Problem Array, Dynamic Programming, Breadth-First Search
MEDIUM Partition List 26.5 0.59 View Problem Linked List, Two Pointers
EASY Big Countries 26.5 0.68 View Problem Database
MEDIUM 3Sum Closest 26.5 0.47 View Problem Array, Two Pointers, Sorting
MEDIUM Count Primes 26.5 0.35 View Problem Array, Math, Enumeration, Number Theory
EASY First Unique Character in a String 26.5 0.64 View Problem Hash Table, String, Queue, Counting
EASY Intersection of Two Arrays 26.5 0.76 View Problem Array, Hash Table, Two Pointers, Binary Search, Sorting
MEDIUM Product of Array Except Self 26.5 0.68 View Problem Array, Prefix Sum