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Easy 0/51
Medium 0/45
Hard 0/4
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Difficulty Title Frequency Acceptance Rate Link Topics
MEDIUM Bulb Switcher 100.0 0.54 View Problem Math, Brainteaser
EASY Happy Number 99.0 0.58 View Problem Hash Table, Math, Two Pointers
EASY Two Sum 95.7 0.56 View Problem Array, Hash Table
EASY Climbing Stairs 92.0 0.54 View Problem Math, Dynamic Programming, Memoization
EASY Best Time to Buy and Sell Stock 92.0 0.55 View Problem Array, Dynamic Programming
EASY Palindrome Number 85.8 0.59 View Problem Math
MEDIUM Rotate Array 84.0 0.43 View Problem Array, Math, Two Pointers
EASY Roman to Integer 79.9 0.65 View Problem Hash Table, Math, String
MEDIUM Maximum Subarray 79.9 0.52 View Problem Array, Divide and Conquer, Dynamic Programming
MEDIUM Delete and Earn 79.9 0.57 View Problem Array, Hash Table, Dynamic Programming
EASY Sum of Values at Indices With K Set Bits 77.6 0.86 View Problem Array, Bit Manipulation
EASY Find Subsequence of Length K With the Largest Sum 77.6 0.46 View Problem Array, Hash Table, Sorting, Heap (Priority Queue)
EASY Maximum Area of Longest Diagonal Rectangle 77.6 0.37 View Problem Array
EASY Ant on the Boundary 77.6 0.74 View Problem Array, Simulation, Prefix Sum
EASY Count Tested Devices After Test Operations 77.6 0.78 View Problem Array, Simulation, Counting
EASY Permutation Difference between Two Strings 77.6 0.87 View Problem Hash Table, String
EASY Minimum Right Shifts to Sort the Array 77.6 0.57 View Problem Array
MEDIUM Reverse Integer 75.0 0.30 View Problem Math
MEDIUM Longest Palindromic Substring 75.0 0.36 View Problem Two Pointers, String, Dynamic Programming
MEDIUM Largest Number 75.0 0.41 View Problem Array, String, Greedy, Sorting
EASY Merge Sorted Array 75.0 0.53 View Problem Array, Two Pointers, Sorting
EASY Longest Common Prefix 75.0 0.45 View Problem String, Trie
MEDIUM Spiral Matrix 72.1 0.54 View Problem Array, Matrix, Simulation
HARD Shortest Palindrome 68.9 0.41 View Problem String, Rolling Hash, String Matching, Hash Function
EASY Sort Integers by The Number of 1 Bits 68.9 0.79 View Problem Array, Bit Manipulation, Sorting, Counting
EASY Majority Element 68.9 0.66 View Problem Array, Hash Table, Divide and Conquer, Sorting, Counting
MEDIUM Longest Substring Without Repeating Characters 68.9 0.37 View Problem Hash Table, String, Sliding Window
MEDIUM 3Sum 68.9 0.37 View Problem Array, Two Pointers, Sorting
MEDIUM Find Peak Element 68.9 0.47 View Problem Array, Binary Search
MEDIUM Reverse Words in a String 68.9 0.52 View Problem Two Pointers, String
MEDIUM Perfect Squares 68.9 0.56 View Problem Math, Dynamic Programming, Breadth-First Search
MEDIUM Integer Break 65.1 0.61 View Problem Math, Dynamic Programming
EASY Valid Anagram 65.1 0.67 View Problem Hash Table, String, Sorting
EASY Valid Parentheses 65.1 0.42 View Problem String, Stack
EASY Plus One 60.7 0.48 View Problem Array, Math
MEDIUM Product of Array Except Self 60.7 0.68 View Problem Array, Prefix Sum
MEDIUM Container With Most Water 60.7 0.58 View Problem Array, Two Pointers, Greedy
EASY Fibonacci Number 60.7 0.73 View Problem Math, Dynamic Programming, Recursion, Memoization
EASY Remove Duplicates from Sorted Array 60.7 0.60 View Problem Array, Two Pointers
MEDIUM Add Two Numbers 60.7 0.46 View Problem Linked List, Math, Recursion
EASY Assign Cookies 55.3 0.54 View Problem Array, Two Pointers, Greedy, Sorting
MEDIUM House Robber 55.3 0.52 View Problem Array, Dynamic Programming
EASY Reverse Vowels of a String 55.3 0.58 View Problem Two Pointers, String
MEDIUM Find First and Last Position of Element in Sorted Array 55.3 0.47 View Problem Array, Binary Search
MEDIUM Longest Increasing Subsequence 55.3 0.58 View Problem Array, Binary Search, Dynamic Programming
MEDIUM Coin Change 55.3 0.46 View Problem Array, Dynamic Programming, Breadth-First Search
MEDIUM Nth Digit 55.3 0.36 View Problem Math, Binary Search
HARD Candy 55.3 0.47 View Problem Array, Greedy
MEDIUM Count Primes 55.3 0.35 View Problem Array, Math, Enumeration, Number Theory
MEDIUM Merge Intervals 55.3 0.49 View Problem Array, Sorting
MEDIUM Koko Eating Bananas 55.3 0.49 View Problem Array, Binary Search
EASY Pascal's Triangle 55.3 0.77 View Problem Array, Dynamic Programming
MEDIUM Rotate Image 48.3 0.78 View Problem Array, Math, Matrix
EASY Perfect Number 48.3 0.45 View Problem Math
EASY Sort Array by Increasing Frequency 48.3 0.80 View Problem Array, Hash Table, Sorting
MEDIUM Find the Winner of the Circular Game 48.3 0.82 View Problem Array, Math, Recursion, Queue, Simulation
EASY Next Greater Element I 48.3 0.75 View Problem Array, Hash Table, Stack, Monotonic Stack
EASY Valid Palindrome 48.3 0.51 View Problem Two Pointers, String
MEDIUM Edit Distance 48.3 0.59 View Problem String, Dynamic Programming
MEDIUM Next Permutation 48.3 0.43 View Problem Array, Two Pointers
EASY Reverse Linked List 48.3 0.79 View Problem Linked List, Recursion
EASY Remove Element 48.3 0.60 View Problem Array, Two Pointers
EASY Remove Duplicates from Sorted List 48.3 0.55 View Problem Linked List
EASY Is Subsequence 48.3 0.48 View Problem Two Pointers, String, Dynamic Programming
EASY Find the Index of the First Occurrence in a String 48.3 0.45 View Problem Two Pointers, String, String Matching
MEDIUM Peak Index in a Mountain Array 48.3 0.68 View Problem Array, Binary Search
EASY Max Consecutive Ones 48.3 0.62 View Problem Array
MEDIUM Unique Paths 48.3 0.66 View Problem Math, Dynamic Programming, Combinatorics
EASY Contains Duplicate 48.3 0.63 View Problem Array, Hash Table, Sorting
MEDIUM Majority Element II 48.3 0.54 View Problem Array, Hash Table, Sorting, Counting
MEDIUM 01 Matrix 38.7 0.51 View Problem Array, Dynamic Programming, Breadth-First Search, Matrix
EASY Average Value of Even Numbers That Are Divisible by Three 38.7 0.62 View Problem Array, Math
MEDIUM Integer to Roman 38.7 0.69 View Problem Hash Table, Math, String
MEDIUM Single Number II 38.7 0.65 View Problem Array, Bit Manipulation
MEDIUM Daily Temperatures 38.7 0.67 View Problem Array, Stack, Monotonic Stack
MEDIUM Search a 2D Matrix 38.7 0.52 View Problem Array, Binary Search, Matrix
EASY Count Pairs Whose Sum is Less than Target 38.7 0.87 View Problem Array, Two Pointers, Binary Search, Sorting
MEDIUM Kth Largest Element in an Array 38.7 0.68 View Problem Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
EASY Substrings of Size Three with Distinct Characters 38.7 0.75 View Problem Hash Table, String, Sliding Window, Counting
EASY Count Operations to Obtain Zero 38.7 0.75 View Problem Math, Simulation
EASY Number of Days Between Two Dates 38.7 0.51 View Problem Math, String
EASY Maximum Depth of Binary Tree 38.7 0.77 View Problem Tree, Depth-First Search, Breadth-First Search, Binary Tree
EASY Excel Sheet Column Title 38.7 0.44 View Problem Math, String
MEDIUM Second Highest Salary 38.7 0.44 View Problem Database
EASY Sqrt(x) 38.7 0.40 View Problem Math, Binary Search
MEDIUM Find Original Array From Doubled Array 38.7 0.40 View Problem Array, Hash Table, Greedy, Sorting
EASY N-th Tribonacci Number 38.7 0.64 View Problem Math, Dynamic Programming, Memoization
MEDIUM Basic Calculator II 38.7 0.46 View Problem Math, String, Stack
MEDIUM Pow(x, n) 38.7 0.37 View Problem Math, Recursion
MEDIUM Ugly Number II 38.7 0.49 View Problem Hash Table, Math, Dynamic Programming, Heap (Priority Queue)
EASY Intersection of Two Linked Lists 38.7 0.61 View Problem Hash Table, Linked List, Two Pointers
MEDIUM Group Anagrams 38.7 0.71 View Problem Array, Hash Table, String, Sorting
EASY How Many Numbers Are Smaller Than the Current Number 38.7 0.87 View Problem Array, Hash Table, Sorting, Counting Sort
MEDIUM Palindromic Substrings 38.7 0.72 View Problem Two Pointers, String, Dynamic Programming
EASY Min Cost Climbing Stairs 38.7 0.67 View Problem Array, Dynamic Programming
EASY Truncate Sentence 38.7 0.86 View Problem Array, String
HARD Median of Two Sorted Arrays 38.7 0.44 View Problem Array, Binary Search, Divide and Conquer
EASY Binary Search 38.7 0.60 View Problem Array, Binary Search
EASY Make The String Great 38.7 0.68 View Problem String, Stack
HARD Department Top Three Salaries 38.7 0.58 View Problem Database