1 Text Justification Array String Simulation
Hard 100
0.5% 2 Length of Longest V-Shaped Diagonal Segment Array Dynamic Programming Memoization Matrix
Hard 99
0.6% 3 Rotating the Box Array Two Pointers Matrix
Medium 97
0.8% 4 Two Sum Array Hash Table
Easy 96
0.6% 5 Split the Array Array Hash Table Counting
Easy 94
0.6% 6 Longest Substring Without Repeating Characters Hash Table String Sliding Window
Medium 93
0.4% 7 3Sum Array Two Pointers Sorting
Medium 93
0.4% 8 Minimum Operations to Write the Letter Y on a Grid Array Hash Table Matrix Counting
Medium 93
0.6% 9 Find the Length of the Longest Common Prefix Array Hash Table String Trie
Medium 90
0.6% 10 Best Time to Buy and Sell Stock Array Dynamic Programming
Easy 87
0.6% 11 LRU Cache Hash Table Linked List Design Doubly-Linked List
Medium 87
0.5% 12 Create Target Array in the Given Order Array Simulation
Easy 83
0.9% 13 Block Placement Queries Array Binary Search Binary Indexed Tree Segment Tree Ordered Set
Hard 83
0.4% 14 Number of Black Blocks Array Hash Table Enumeration
Medium 81
0.4% 15 Group Anagrams Array Hash Table String Sorting
Medium 78
0.7% 16 Divisor Game Math Dynamic Programming Brainteaser Game Theory
Easy 78
0.7% 17 Count Nodes With the Highest Score Array Tree Depth-First Search Binary Tree
Medium 78
0.5% 18 Two Furthest Houses With Different Colors Array Greedy
Easy 78
0.7% 19 Earliest Possible Day of Full Bloom Array Greedy Sorting
Hard 78
0.7% 20 Match Alphanumerical Pattern in Matrix I Array Hash Table String Matrix
Medium 78
0.7% 21 Maximum Number of Events That Can Be Attended Array Greedy Sorting Heap (Priority Queue)
Medium 78
0.4% 22 Odd String Difference Array Hash Table String
Easy 78
0.6% 23 Simplify Path String Stack
Medium 78
0.5% 24 Number of Adjacent Elements With the Same Color Array
Medium 78
0.6% 25 Merge Intervals Array Sorting
Medium 76
0.5% 26 Trapping Rain Water Array Two Pointers Dynamic Programming Stack Monotonic Stack
Hard 73
0.7% 27 Maximum Subarray Array Divide and Conquer Dynamic Programming
Medium 73
0.5% 28 Largest Rectangle in Histogram Array Stack Monotonic Stack
Hard 73
0.5% 29 Number of Divisible Triplet Sums Array Hash Table
Medium 73
0.7% 30 Maximum Sum of Alternating Subsequence With Distance at Least K Array Dynamic Programming Segment Tree
Hard 73
0.3% 31 Longest Palindromic Substring Two Pointers String Dynamic Programming
Medium 70
0.4% 32 Valid Parentheses String Stack
Easy 70
0.4% 33 Number of Islands Array Depth-First Search Breadth-First Search Union-Find Matrix
Medium 70
0.6% 34 Longest Common Prefix Array String Trie
Easy 66
0.5% 35 Minimum Time Difference Array Math String Sorting
Medium 66
0.6% 36 Minimum Absolute Difference Between Elements With Constraint Array Binary Search Ordered Set
Medium 66
0.4% 37 Beautiful Arrangement Array Dynamic Programming Backtracking Bit Manipulation Bitmask
Medium 66
0.6% 38 Walls and Gates Array Breadth-First Search Matrix
Medium 61
0.6% 39 Spiral Matrix Array Matrix Simulation
Medium 61
0.6% 40 Reverse Linked List Linked List Recursion
Easy 61
0.8% 41 Rotate Image Array Math Matrix
Medium 61
0.8% 42 Count Palindromic Subsequences String Dynamic Programming
Hard 61
0.4% 43 Exclusive Time of Functions Array Stack
Medium 61
0.7% 44 Course Schedule Depth-First Search Breadth-First Search Graph Theory Topological Sort
Medium 56
0.5% 45 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Array Queue Sliding Window Heap (Priority Queue) Ordered Set Monotonic Queue
Medium 56
0.6% 46 Restore IP Addresses String Backtracking
Medium 56
0.6% 47 Container With Most Water Array Two Pointers Greedy
Medium 56
0.6% 48 Merge Two Sorted Lists Linked List Recursion
Easy 56
0.7% 49 Sort Colors Array Two Pointers Sorting
Medium 56
0.7% 50 Happy Number Hash Table Math Two Pointers
Easy 56
0.6% 51 Grid Teleportation Traversal Array Hash Table Breadth-First Search Matrix
Medium 56
0.2% 52 Matrix Block Sum Array Matrix Prefix Sum
Medium 56
0.8% 53 Gas Station Array Greedy
Medium 56
0.5% 54 Subarray Sum Equals K Array Hash Table Prefix Sum
Medium 56
0.5% 55 Number of Changing Keys String
Easy 56
0.8% 56 Minimum Cost Path with Teleportations Array Dynamic Programming Matrix
Hard 56
0.5% 57 Number of Perfect Pairs Array Math Two Pointers Sorting
Medium 56
0.3% 58 Divide Players Into Teams of Equal Skill Array Hash Table Two Pointers Sorting
Medium 56
0.7% 59 Maximum OR Array Greedy Bit Manipulation Prefix Sum
Medium 56
0.4% 60 Minimum Number of Swaps to Make the String Balanced Two Pointers String Stack Greedy
Medium 56
0.8% 61 Check If Array Pairs Are Divisible by k Array Hash Table Counting
Medium 49
0.5% 62 Diameter of Binary Tree Tree Depth-First Search Binary Tree
Easy 49
0.7% 63 Image Smoother Array Matrix
Easy 49
0.7% 64 Top K Frequent Elements Array Hash Table Divide and Conquer Sorting Heap (Priority Queue) Bucket Sort Counting Quickselect
Medium 49
0.7% 65 Word Ladder Hash Table String Breadth-First Search
Hard 49
0.5% 66 Candy Crush Array Two Pointers Matrix Simulation
Medium 49
0.8% 67 Partition Equal Subset Sum Array Dynamic Programming
Medium 49
0.5% 68 Number of Matching Subsequences Array Hash Table String Binary Search Dynamic Programming Trie Sorting
Medium 49
0.5% 69 Balanced Binary Tree Tree Depth-First Search Binary Tree
Easy 49
0.6% 70 Find Median from Data Stream Two Pointers Design Sorting Heap (Priority Queue) Data Stream
Hard 49
0.5% 71 Longest Valid Parentheses String Dynamic Programming Stack
Hard 49
0.4% 72 Best Time to Buy and Sell Stock II Array Dynamic Programming Greedy
Medium 49
0.7% 73 Product of Array Except Self Array Prefix Sum
Medium 49
0.7% 74 Add Binary Math String Bit Manipulation Simulation
Easy 49
0.6% 75 Add Strings Math String Simulation
Easy 49
0.5% 76 Sell Diminishing-Valued Colored Balls Array Math Binary Search Greedy Sorting Heap (Priority Queue)
Medium 49
0.3% 77 Median of Two Sorted Arrays Array Binary Search Divide and Conquer
Hard 39
0.5% 78 Plus One Array Math
Easy 39
0.5% 79 Reverse Words in a String Two Pointers String
Medium 39
0.6% 80 Daily Temperatures Array Stack Monotonic Stack
Medium 39
0.7% 81 Find Score of an Array After Marking All Elements Array Hash Table Sorting Heap (Priority Queue) Simulation
Medium 39
0.6% 82 Reverse Nodes in k-Group Linked List Recursion
Hard 39
0.7% 83 Rotate Array Array Math Two Pointers
Medium 39
0.5% 84 Valid Anagram Hash Table String Sorting
Easy 39
0.7% 85 Best Time to Buy and Sell Stock III Array Dynamic Programming
Hard 39
0.5% 86 Find Peak Element Array Binary Search
Medium 39
0.5% 87 Sliding Window Maximum Array Queue Sliding Window Heap (Priority Queue) Monotonic Queue
Hard 39
0.5% 88 Substrings of Size Three with Distinct Characters Hash Table String Sliding Window Counting
Easy 39
0.8% 89 Number of Subarrays That Match a Pattern I Array Rolling Hash String Matching Hash Function
Medium 39
0.7% 90 House Robber II Array Dynamic Programming
Medium 39
0.5% 91 Edit Distance String Dynamic Programming
Medium 39
0.6% 92 Brightest Position on Street Array Sorting Prefix Sum Ordered Set
Medium 39
0.6% 93 Contains Duplicate Array Hash Table Sorting
Easy 39
0.6% 94 Sum Root to Leaf Numbers Tree Depth-First Search Binary Tree
Medium 39
0.7% 95 LFU Cache Hash Table Linked List Design Doubly-Linked List
Hard 39
0.5% 96 Longest Increasing Subsequence Array Binary Search Dynamic Programming
Medium 39
0.6% 97 Sort Characters By Frequency Hash Table String Sorting Heap (Priority Queue) Bucket Sort Counting
Medium 39
0.8% 98 Binary Tree Right Side View Tree Depth-First Search Breadth-First Search Binary Tree
Medium 39
0.7% 99 Check if Array Is Sorted and Rotated Array
Easy 39
0.6% 100 Kth Largest Element in an Array Array Divide and Conquer Sorting Heap (Priority Queue) Quickselect
Medium 39
0.7% 101 Reverse Vowels of a String Two Pointers String
Easy 39
0.6% 102 Valid Palindrome II Two Pointers String Greedy
Easy 39
0.4% 103 Two Sum II - Input Array Is Sorted Array Two Pointers Binary Search
Medium 39
0.7% 104 Ugly Number II Hash Table Math Dynamic Programming Heap (Priority Queue)
Medium 39
0.5% 105 Unique Paths Math Dynamic Programming Combinatorics
Medium 39
0.7% 106 Restore the Array From Adjacent Pairs Array Hash Table Depth-First Search
Medium 39
0.8% 107 Letter Combinations of a Phone Number Hash Table String Backtracking
Medium 39
0.7% 108 Reconstruct Itinerary Array String Depth-First Search Graph Theory Sorting Heap (Priority Queue) Eulerian Circuit
Hard 39
0.4% 109 Design Memory Allocator Array Hash Table Design Simulation
Medium 39
0.5% 110 Last Stone Weight Array Heap (Priority Queue)
Easy 39
0.7% 111 Count Mentions Per User Array Math Sorting Simulation
Medium 39
0.5% 112 Best Time to Buy and Sell Stock using Strategy Array Sliding Window Prefix Sum
Medium 39
0.6% 113 Maximal Rectangle Array Dynamic Programming Stack Matrix Monotonic Stack
Hard 39
0.6% 114 Add Digits Math Simulation Number Theory
Easy 39
0.7% 115 Candy Array Greedy
Hard 39
0.5% 116 Alternating Digit Sum Math
Easy 39
0.7% 117 Next Greater Element II Array Stack Monotonic Stack
Medium 39
0.7% 118 Word Search Array String Backtracking Depth-First Search Matrix
Medium 39
0.5% 119 Merge Sorted Array Array Two Pointers Sorting
Easy 39
0.6% 120 Rotting Oranges Array Breadth-First Search Matrix
Medium 39
0.6% 121 Subarray Sums Divisible by K Array Hash Table Prefix Sum
Medium 39
0.6% 122 Longest Consecutive Sequence Array Hash Table Union-Find
Medium 39
0.5% 123 Valid Palindrome Two Pointers String
Easy 39
0.5% 124 First Unique Character in a String Hash Table String Queue Counting
Easy 39
0.7% 125 Count Good Numbers Math Recursion
Medium 39
0.6% 126 Hand of Straights Array Hash Table Greedy Sorting
Medium 39
0.6% 127 Non-overlapping Intervals Array Dynamic Programming Greedy Sorting
Medium 39
0.6% 128 Palindrome Partitioning String Dynamic Programming Backtracking
Medium 39
0.7% 129 Maximal Score After Applying K Operations Array Greedy Heap (Priority Queue)
Medium 39
0.6% 130 Flood Fill Array Depth-First Search Breadth-First Search Matrix
Easy 39
0.7% 131 Meeting Rooms II Array Two Pointers Greedy Sorting Heap (Priority Queue) Prefix Sum
Medium 39
0.5% 132 Word Break Array Hash Table String Dynamic Programming Trie Memoization
Medium 39
0.5% 133 Word Break II Array Hash Table String Dynamic Programming Backtracking Trie Memoization
Hard 39
0.6% 134 Maximum Palindromes After Operations Array Hash Table String Greedy Sorting Counting
Medium 39
0.5% 135 Jump Game VI Array Dynamic Programming Queue Heap (Priority Queue) Monotonic Queue
Medium 39
0.5% 136 Path With Minimum Effort Array Binary Search Depth-First Search Breadth-First Search Union-Find Heap (Priority Queue) Matrix
Medium 39
0.6% 137 Capacity To Ship Packages Within D Days Array Binary Search
Medium 39
0.7% 138 Minimum Suffix Flips String Greedy
Medium 39
0.7% 139 Longest Common Subsequence String Dynamic Programming
Medium 39
0.6% 140 Minimize Maximum of Array Array Binary Search Dynamic Programming Greedy Prefix Sum
Medium 39
0.5% 141 Binary Tree Level Order Traversal Tree Breadth-First Search Binary Tree
Medium 39
0.7% 142 Word Search II Array String Backtracking Trie Matrix
Hard 39
0.4% 143 Kth Largest Sum in a Binary Tree Tree Breadth-First Search Sorting Binary Tree
Medium 39
0.6% 144 Longest Non-decreasing Subarray From Two Arrays Array Dynamic Programming
Medium 39
0.3% 145 Search in Rotated Sorted Array Array Binary Search
Medium 39
0.5% 146 Count Ways To Build Good Strings Dynamic Programming
Medium 39
0.6%