| Friday Purchases I | Medium | 80.6% | 100.0% | |
| Two Sum | Easy | 57.1% | 87.5% | ArrayHash Table |
| Longest Palindromic Substring | Medium | 37.3% | 75.0% | Two PointersStringDynamic Programming |
| Palindrome Number | Easy | 60.2% | 75.0% | Math |
| Majority Element | Easy | 66.1% | 75.0% | ArrayHash TableDivide and Conquer+2 |
| Longest Common Prefix | Easy | 47.1% | 62.5% | ArrayStringTrie |
| 3Sum | Medium | 38.6% | 62.5% | ArrayTwo PointersSorting |
| Find the Index of the First Occurrence in a String | Easy | 46.2% | 62.5% | Two PointersStringString Matching |
| Valid Parentheses | Easy | 43.7% | 62.5% | StringStack |
| Maximum Subarray | Medium | 53.0% | 62.5% | ArrayDivide and ConquerDynamic Programming |
| Jump Game | Medium | 40.5% | 62.5% | ArrayDynamic ProgrammingGreedy |
| Unique Paths | Medium | 66.5% | 62.5% | MathDynamic ProgrammingCombinatorics |
| Sort Colors | Medium | 69.1% | 62.5% | ArrayTwo PointersSorting |
| Best Time to Buy and Sell Stock | Easy | 56.4% | 62.5% | ArrayDynamic Programming |
| Single Number | Easy | 77.3% | 62.5% | ArrayBit Manipulation |
| Second Highest Salary | Medium | 46.3% | 62.5% | Database |
| Rotate Array | Medium | 44.4% | 62.5% | ArrayMathTwo Pointers |
| Valid Anagram | Easy | 67.8% | 62.5% | Hash TableStringSorting |
| Move Zeroes | Easy | 63.5% | 62.5% | ArrayTwo Pointers |
| Remove Letter To Equalize Frequency | Easy | 19.2% | 62.5% | Hash TableStringCounting |
| Count the Digits That Divide a Number | Easy | 85.9% | 62.5% | Math |
| Subarray Sum Equals K | Medium | 46.8% | 62.5% | ArrayHash TablePrefix Sum |
| Bitwise ORs of Subarrays | Medium | 56.8% | 62.5% | ArrayDynamic ProgrammingBit Manipulation |
| Check if Array Is Sorted and Rotated | Easy | 55.7% | 62.5% | Array |
| Maximum Ascending Subarray Sum | Easy | 66.3% | 62.5% | Array |
| Add Two Numbers | Medium | 47.9% | 50.0% | Linked ListMathRecursion |
| Longest Substring Without Repeating Characters | Medium | 38.5% | 50.0% | Hash TableStringSliding Window |
| Reverse Integer | Medium | 31.5% | 50.0% | Math |
| Container With Most Water | Medium | 59.5% | 50.0% | ArrayTwo PointersGreedy |
| Roman to Integer | Easy | 66.2% | 50.0% | Hash TableMathString |
| 4Sum | Medium | 40.0% | 50.0% | ArrayTwo PointersSorting |
| Remove Duplicates from Sorted Array | Easy | 62.2% | 50.0% | ArrayTwo Pointers |
| Trapping Rain Water | Hard | 66.8% | 50.0% | ArrayTwo PointersDynamic Programming+2 |
| Pow(x, n) | Medium | 38.2% | 50.0% | MathRecursion |
| Spiral Matrix | Medium | 56.1% | 50.0% | ArrayMatrixSimulation |
| Plus One | Easy | 49.5% | 50.0% | ArrayMath |
| Merge Sorted Array | Easy | 54.4% | 50.0% | ArrayTwo PointersSorting |
| Happy Number | Easy | 59.2% | 50.0% | Hash TableMathTwo Pointers |
| Contains Duplicate | Easy | 64.1% | 50.0% | ArrayHash TableSorting |
| Sliding Window Maximum | Hard | 48.4% | 50.0% | ArrayQueueSliding Window+2 |
| Missing Number | Easy | 71.6% | 50.0% | ArrayHash TableMath+3 |
| Add Binary | Easy | 57.6% | 50.0% | MathStringBit Manipulation+1 |
| Reverse String | Easy | 80.5% | 50.0% | Two PointersString |
| Minimum Cuts to Divide a Circle | Easy | 56.0% | 50.0% | MathGeometry |
| Fibonacci Number | Easy | 73.9% | 50.0% | MathDynamic ProgrammingRecursion+1 |
| Minimum Operations to Exceed Threshold Value I | Easy | 86.6% | 50.0% | Array |
| Minimum Operations to Exceed Threshold Value II | Medium | 45.8% | 50.0% | ArrayHeap (Priority Queue)Simulation |
| Palindrome Partitioning IV | Hard | 45.2% | 50.0% | StringDynamic Programming |
| Valid Palindrome | Easy | 52.8% | 50.0% | Two PointersString |
| N-Queens | Hard | 74.9% | 50.0% | ArrayBacktracking |
| Zigzag Grid Traversal With Skip | Easy | 64.8% | 50.0% | ArrayMatrixSimulation |
| Median of Two Sorted Arrays | Hard | 45.9% | 50.0% | ArrayBinary SearchDivide and Conquer |
| Merge Intervals | Medium | 51.1% | 50.0% | ArraySorting |
| Search in Rotated Sorted Array | Medium | 44.1% | 50.0% | ArrayBinary Search |
| Task Scheduler | Medium | 62.6% | 50.0% | ArrayHash TableGreedy+3 |
| 3Sum Closest | Medium | 48.0% | 37.5% | ArrayTwo PointersSorting |
| Generate Parentheses | Medium | 78.2% | 37.5% | StringDynamic ProgrammingBacktracking |
| Next Permutation | Medium | 44.7% | 37.5% | ArrayTwo Pointers |
| Find First and Last Position of Element in Sorted Array | Medium | 48.3% | 37.5% | ArrayBinary Search |
| Length of Last Word | Easy | 58.3% | 37.5% | String |
| Climbing Stairs | Easy | 53.9% | 37.5% | MathDynamic ProgrammingMemoization |
| Set Matrix Zeroes | Medium | 62.4% | 37.5% | ArrayHash TableMatrix |
| Sqrt(x) | Easy | 41.4% | 37.5% | MathBinary Search |
| Subsets | Medium | 82.0% | 37.5% | ArrayBacktrackingBit Manipulation |
| Largest Rectangle in Histogram | Hard | 49.3% | 37.5% | ArrayStackMonotonic Stack |
| Pascal's Triangle | Easy | 78.7% | 37.5% | ArrayDynamic Programming |
| Best Time to Buy and Sell Stock II | Medium | 70.7% | 37.5% | ArrayDynamic ProgrammingGreedy |
| Longest Consecutive Sequence | Medium | 47.0% | 37.5% | ArrayHash TableUnion-Find |
| Reverse Words in a String | Medium | 55.5% | 37.5% | Two PointersString |
| Maximum Product Subarray | Medium | 36.0% | 37.5% | ArrayDynamic Programming |
| Largest Number | Medium | 42.6% | 37.5% | ArrayStringGreedy+1 |
| Department Top Three Salaries | Hard | 59.8% | 37.5% | Database |
| Reverse Linked List | Easy | 80.2% | 37.5% | Linked ListRecursion |
| Power of Two | Easy | 49.8% | 37.5% | MathBit ManipulationRecursion |
| Intersection of Two Arrays | Easy | 77.5% | 37.5% | ArrayHash TableTwo Pointers+2 |
| First Unique Character in a String | Easy | 65.0% | 37.5% | Hash TableStringQueue+1 |
| Fizz Buzz | Easy | 75.2% | 37.5% | MathStringSimulation |
| K-diff Pairs in an Array | Medium | 45.6% | 37.5% | ArrayHash TableTwo Pointers+2 |
| Single Element in a Sorted Array | Medium | 59.2% | 37.5% | ArrayBinary Search |
| Employee Bonus | Easy | 77.1% | 37.5% | Database |
| Find Customer Referee | Easy | 72.6% | 37.5% | Database |
| N-th Tribonacci Number | Easy | 63.3% | 37.5% | MathDynamic ProgrammingMemoization |
| Article Views I | Easy | 76.7% | 37.5% | Database |
| Sum of Unique Elements | Easy | 79.8% | 37.5% | ArrayHash TableCounting |
| Sort an Array | Medium | 55.9% | 37.5% | ArrayDivide and ConquerSorting+5 |
| Diameter of Binary Tree | Easy | 65.0% | 37.5% | TreeDepth-First SearchBinary Tree |
| Integer to English Words | Hard | 34.8% | 37.5% | MathStringRecursion |
| Find the Duplicate Number | Medium | 64.0% | 37.5% | ArrayTwo PointersBinary Search+1 |
| Search Insert Position | Easy | 50.7% | 37.5% | ArrayBinary Search |
| Delete Duplicate Emails | Easy | 65.6% | 37.5% | Database |
| Recyclable and Low Fat Products | Easy | 88.8% | 37.5% | Database |
| Maximal Rectangle | Hard | 58.1% | 37.5% | ArrayDynamic ProgrammingStack+2 |
| Convert a Number to Hexadecimal | Easy | 53.2% | 37.5% | MathStringBit Manipulation |
| Max Consecutive Ones | Easy | 64.6% | 37.5% | Array |
| Partition Equal Subset Sum | Medium | 49.2% | 37.5% | ArrayDynamic Programming |
| Project Employees I | Easy | 66.5% | 37.5% | Database |
| Split Array With Same Average | Hard | 26.8% | 37.5% | ArrayHash TableMath+3 |
| Count Number of Pairs With Absolute Difference K | Easy | 85.3% | 37.5% | ArrayHash TableCounting |
| Group Anagrams | Medium | 72.2% | 37.5% | ArrayHash TableString+1 |
| Number of Good Pairs | Easy | 89.8% | 37.5% | ArrayHash TableMath+1 |
| Jump Game II | Medium | 42.5% | 37.5% | ArrayDynamic ProgrammingGreedy |
| Contains Duplicate II | Easy | 50.8% | 37.5% | ArrayHash TableSliding Window |
| Binary Tree Maximum Path Sum | Hard | 42.0% | 37.5% | Dynamic ProgrammingTreeDepth-First Search+1 |
| Merge k Sorted Lists | Hard | 58.8% | 37.5% | Linked ListDivide and ConquerHeap (Priority Queue)+1 |
| Linked List Cycle | Easy | 53.9% | 37.5% | Hash TableLinked ListTwo Pointers |
| Remove Nth Node From End of List | Medium | 51.0% | 37.5% | Linked ListTwo Pointers |
| House Robber | Medium | 52.9% | 37.5% | ArrayDynamic Programming |
| Tallest Billboard | Hard | 51.8% | 37.5% | ArrayDynamic Programming |
| Ugly Number | Easy | 43.1% | 37.5% | Math |
| Maximum Product of Three Numbers | Easy | 45.7% | 37.5% | ArrayMathSorting |
| Min Stack | Medium | 57.7% | 37.5% | StackDesign |
| Koko Eating Bananas | Medium | 49.7% | 37.5% | ArrayBinary Search |
| Middle of the Linked List | Easy | 81.5% | 37.5% | Linked ListTwo Pointers |
| Duplicate Emails | Easy | 73.4% | 37.5% | Database |
| Smallest Sufficient Team | Hard | 55.4% | 37.5% | ArrayDynamic ProgrammingBit Manipulation+1 |
| Minimum Moves to Equal Array Elements II | Medium | 61.5% | 37.5% | ArrayMathSorting |
| Serialize and Deserialize Binary Tree | Hard | 60.3% | 37.5% | StringTreeDepth-First Search+3 |
| Maximum Average Subarray I | Easy | 47.0% | 37.5% | ArraySliding Window |
| Delete the Middle Node of a Linked List | Medium | 59.5% | 37.5% | Linked ListTwo Pointers |
| Search in Rotated Sorted Array II | Medium | 39.7% | 37.5% | ArrayBinary Search |
| Product Sales Analysis I | Easy | 85.6% | 37.5% | Database |
| Burst Balloons | Hard | 62.9% | 37.5% | ArrayDynamic Programming |
| Subsets II | Medium | 60.9% | 37.5% | ArrayBacktrackingBit Manipulation |
| Longest Subarray of 1's After Deleting One Element | Medium | 71.0% | 37.5% | ArrayDynamic ProgrammingSliding Window |
| Water Bottles | Easy | 72.6% | 37.5% | MathSimulation |
| Letter Combinations of a Phone Number | Medium | 65.5% | 37.5% | Hash TableStringBacktracking |
| Squares of a Sorted Array | Easy | 73.6% | 37.5% | ArrayTwo PointersSorting |
| How Many Numbers Are Smaller Than the Current Number | Easy | 87.5% | 37.5% | ArrayHash TableSorting+1 |
| Remove Element | Easy | 61.3% | 37.5% | ArrayTwo Pointers |
| Longest Palindromic Subsequence | Medium | 65.1% | 37.5% | StringDynamic Programming |
| Merge Two Sorted Lists | Easy | 67.9% | 25.0% | Linked ListRecursion |
| Combination Sum | Medium | 76.1% | 25.0% | ArrayBacktracking |
| Edit Distance | Medium | 60.1% | 25.0% | StringDynamic Programming |
| Remove Duplicates from Sorted Array II | Medium | 64.3% | 25.0% | ArrayTwo Pointers |
| Word Search | Medium | 46.8% | 25.0% | ArrayStringBacktracking+2 |
| Count Primes | Medium | 35.7% | 25.0% | ArrayMathEnumeration+1 |
| Sort Characters By Frequency | Medium | 75.1% | 25.0% | Hash TableStringSorting+3 |
| Big Countries | Easy | 68.4% | 25.0% | Database |
| Toeplitz Matrix | Easy | 69.6% | 25.0% | ArrayMatrix |
| Binary Search | Easy | 60.5% | 25.0% | ArrayBinary Search |
| Peak Index in a Mountain Array | Medium | 66.9% | 25.0% | ArrayBinary Search |
| Longest Common Subsequence | Medium | 58.9% | 25.0% | StringDynamic Programming |
| Path with Maximum Probability | Medium | 65.5% | 25.0% | ArrayGraph TheoryHeap (Priority Queue)+1 |
| Sort Array by Increasing Frequency | Easy | 80.7% | 25.0% | ArrayHash TableSorting |
| Find Minimum Operations to Make All Elements Divisible by Three | Easy | 90.9% | 25.0% | ArrayMath |
| Unique Paths II | Medium | 44.1% | 25.0% | ArrayDynamic ProgrammingMatrix |
| The kth Factor of n | Medium | 70.2% | 25.0% | MathNumber Theory |
| Find Peak Element | Medium | 46.8% | 25.0% | ArrayBinary Search |
| Divisor Game | Easy | 71.5% | 25.0% | MathDynamic ProgrammingBrainteaser+1 |
| Minimum Add to Make Parentheses Valid | Medium | 74.4% | 25.0% | StringStackGreedy |
| Maximum Swap | Medium | 51.9% | 25.0% | MathGreedy |
| Majority Element II | Medium | 55.8% | 25.0% | ArrayHash TableSorting+1 |
| String Compression III | Medium | 67.0% | 25.0% | String |
| Factorial Trailing Zeroes | Medium | 46.1% | 25.0% | Math |
| Check If a Word Occurs As a Prefix of Any Word in a Sentence | Easy | 68.8% | 25.0% | Two PointersStringString Matching |
| Find the Highest Altitude | Easy | 83.9% | 25.0% | ArrayPrefix Sum |
| Maximum Sum of Distinct Subarrays With Length K | Medium | 42.8% | 25.0% | ArrayHash TableSliding Window |
| To Be Or Not To Be | Easy | 63.3% | 25.0% | |
| Guess Number Higher or Lower | Easy | 57.1% | 25.0% | Binary SearchInteractive |
| Running Sum of 1d Array | Easy | 86.9% | 25.0% | ArrayPrefix Sum |
| Minimum Cost to Make at Least One Valid Path in a Grid | Hard | 70.9% | 25.0% | ArrayBreadth-First SearchGraph Theory+3 |
| Replace Employee ID With The Unique Identifier | Easy | 83.5% | 25.0% | Database |
| Permutation in String | Medium | 48.4% | 25.0% | Hash TableTwo PointersString+1 |
| Check If Array Pairs Are Divisible by k | Medium | 46.2% | 25.0% | ArrayHash TableCounting |
| Matrix Diagonal Sum | Easy | 84.1% | 25.0% | ArrayMatrix |
| Zigzag Conversion | Medium | 53.5% | 25.0% | String |
| Rotate Image | Medium | 79.3% | 25.0% | ArrayMathMatrix |
| Find K Closest Elements | Medium | 49.4% | 25.0% | ArrayTwo PointersBinary Search+3 |
| Find All Duplicates in an Array | Medium | 76.8% | 25.0% | ArrayHash TableSorting |
| LRU Cache | Medium | 46.8% | 25.0% | Hash TableLinked ListDesign+1 |
| Count the Number of Fair Pairs | Medium | 52.7% | 25.0% | ArrayTwo PointersBinary Search+1 |
| Return Length of Arguments Passed | Easy | 94.5% | 25.0% | |
| Number of Provinces | Medium | 70.0% | 25.0% | Depth-First SearchBreadth-First SearchUnion-Find+1 |
| Remove All Occurrences of a Substring | Medium | 78.4% | 25.0% | StringStackSimulation |
| Third Maximum Number | Easy | 38.8% | 25.0% | ArraySorting |
| First Missing Positive | Hard | 42.4% | 25.0% | ArrayHash Table |
| Find Subsequence of Length K With the Largest Sum | Easy | 57.4% | 25.0% | ArrayHash TableSorting+1 |
| Repeated Substring Pattern | Easy | 47.8% | 25.0% | StringString Matching |
| Find the Original Typed String I | Easy | 72.1% | 25.0% | String |
| Maximum Gap | Medium | 51.4% | 25.0% | ArraySortingBucket Sort+1 |
| Maximum Number of Events That Can Be Attended II | Hard | 63.6% | 25.0% | ArrayBinary SearchDynamic Programming+1 |
| Odd Even Linked List | Medium | 62.3% | 25.0% | Linked List |
| Convert Sorted List to Binary Search Tree | Medium | 65.9% | 25.0% | Linked ListDivide and ConquerTree+2 |
| Subarray Product Less Than K | Medium | 53.9% | 25.0% | ArrayBinary SearchSliding Window+1 |
| Valid Word | Easy | 50.9% | 25.0% | String |
| Maximum Nesting Depth of the Parentheses | Easy | 84.8% | 25.0% | StringStack |
| Linked List Cycle II | Medium | 57.2% | 25.0% | Hash TableLinked ListTwo Pointers |
| Create Hello World Function | Easy | 82.0% | 25.0% | |
| Rotate List | Medium | 41.2% | 25.0% | Linked ListTwo Pointers |
| Teemo Attacking | Easy | 57.5% | 25.0% | ArraySimulation |
| Distribute Coins in Binary Tree | Medium | 77.2% | 25.0% | TreeDepth-First SearchBinary Tree |
| Flipping an Image | Easy | 83.6% | 25.0% | ArrayTwo PointersBit Manipulation+2 |
| Minimum Size Subarray Sum | Medium | 51.0% | 25.0% | ArrayBinary SearchSliding Window+1 |
| Maximum Number of Vowels in a Substring of Given Length | Medium | 61.5% | 25.0% | StringSliding Window |
| Search a 2D Matrix | Medium | 53.5% | 25.0% | ArrayBinary SearchMatrix |
| Next Greater Element I | Easy | 75.7% | 25.0% | ArrayHash TableStack+1 |
| Binary Tree Inorder Traversal | Easy | 79.7% | 25.0% | StackTreeDepth-First Search+1 |
| Assign Cookies | Easy | 54.7% | 25.0% | ArrayTwo PointersGreedy+1 |
| Find Minimum in Rotated Sorted Array | Medium | 53.8% | 25.0% | ArrayBinary Search |
| Smallest Integer Divisible by K | Medium | 54.3% | 25.0% | Hash TableMath |
| Department Highest Salary | Medium | 57.3% | 25.0% | Database |
| Reorder List | Medium | 64.6% | 25.0% | Linked ListTwo PointersStack+1 |
| Bulb Switcher | Medium | 55.5% | 25.0% | MathBrainteaser |
| String to Integer (atoi) | Medium | 20.6% | 25.0% | String |
| Regular Expression Matching | Hard | 30.4% | 25.0% | StringDynamic ProgrammingRecursion |
| Managers with at Least 5 Direct Reports | Medium | 48.9% | 25.0% | Database |
| Intersection of Two Arrays II | Easy | 59.7% | 25.0% | ArrayHash TableTwo Pointers+2 |
| Two Best Non-Overlapping Events | Medium | 64.0% | 25.0% | ArrayBinary SearchDynamic Programming+2 |
| Two Sum II - Input Array Is Sorted | Medium | 64.6% | 25.0% | ArrayTwo PointersBinary Search |
| Rotting Oranges | Medium | 58.1% | 25.0% | ArrayBreadth-First SearchMatrix |
| Employees Earning More Than Their Managers | Easy | 72.8% | 25.0% | Database |
| Non-overlapping Intervals | Medium | 56.7% | 25.0% | ArrayDynamic ProgrammingGreedy+1 |
| Range Sum Query - Immutable | Easy | 71.4% | 25.0% | ArrayDesignPrefix Sum |
| Remove Duplicates from Sorted List | Easy | 56.2% | 25.0% | Linked List |
| Longest Balanced Substring II | Medium | 42.1% | 25.0% | Hash TableStringPrefix Sum |
| Count and Say | Medium | 62.3% | 25.0% | String |
| Integer to Roman | Medium | 70.4% | 25.0% | Hash TableMathString |