| Friday Purchases I | Medium | 80.6% | 100.0% | Database |
| Two Sum | Easy | 57.1% | 87.4% | ArrayHash Table |
| Longest Palindromic Substring | Medium | 37.4% | 77.4% | Two PointersStringDynamic Programming |
| Palindrome Number | Easy | 60.3% | 77.4% | Math |
| Maximum Subarray | Medium | 53.0% | 73.2% | ArrayDivide and ConquerDynamic Programming |
| Move Zeroes | Easy | 63.6% | 71.6% | ArrayTwo Pointers |
| Majority Element | Easy | 66.1% | 66.9% | ArrayHash TableDivide and Conquer+2 |
| Longest Common Prefix | Easy | 47.1% | 65.8% | ArrayStringTrie |
| Best Time to Buy and Sell Stock | Easy | 56.4% | 64.6% | ArrayDynamic Programming |
| Sort Colors | Medium | 69.2% | 63.4% | ArrayTwo PointersSorting |
| Valid Anagram | Easy | 67.8% | 62.1% | Hash TableStringSorting |
| Find the Index of the First Occurrence in a String | Easy | 46.3% | 62.1% | Two PointersStringString Matching |
| Single Number | Easy | 77.4% | 62.1% | ArrayBit Manipulation |
| Second Highest Salary | Medium | 46.4% | 62.1% | Database |
| Valid Parentheses | Easy | 43.7% | 62.1% | StringStack |
| Longest Substring Without Repeating Characters | Medium | 38.5% | 60.6% | Hash TableStringSliding Window |
| Subarray Sum Equals K | Medium | 46.8% | 60.6% | ArrayHash TablePrefix Sum |
| Rotate Array | Medium | 44.5% | 59.1% | ArrayMathTwo Pointers |
| Median of Two Sorted Arrays | Hard | 46.0% | 59.1% | ArrayBinary SearchDivide and Conquer |
| Container With Most Water | Medium | 59.6% | 57.4% | ArrayTwo PointersGreedy |
| Remove Duplicates from Sorted Array | Easy | 62.3% | 57.4% | ArrayTwo Pointers |
| 3Sum | Medium | 38.6% | 57.4% | ArrayTwo PointersSorting |
| Reverse Integer | Medium | 31.5% | 57.4% | Math |
| Jump Game | Medium | 40.5% | 57.4% | ArrayDynamic ProgrammingGreedy |
| Contains Duplicate | Easy | 64.1% | 57.4% | ArrayHash TableSorting |
| Remove Letter To Equalize Frequency | Easy | 19.2% | 57.4% | Hash TableStringCounting |
| Maximum Ascending Subarray Sum | Easy | 66.3% | 57.4% | Array |
| Count the Digits That Divide a Number | Easy | 85.9% | 57.4% | Math |
| Maximum Product Subarray | Medium | 36.0% | 55.6% | ArrayDynamic Programming |
| Reverse String | Easy | 80.6% | 55.6% | Two PointersString |
| Task Scheduler | Medium | 62.7% | 55.6% | ArrayHash TableGreedy+3 |
| Check if Array Is Sorted and Rotated | Easy | 55.7% | 55.6% | Array |
| Zigzag Grid Traversal With Skip | Easy | 64.9% | 55.6% | ArrayMatrixSimulation |
| Valid Palindrome | Easy | 52.8% | 55.6% | Two PointersString |
| Minimum Operations to Exceed Threshold Value I | Easy | 86.6% | 55.6% | Array |
| Minimum Operations to Exceed Threshold Value II | Medium | 45.8% | 55.6% | ArrayHeap (Priority Queue)Simulation |
| Palindrome Partitioning IV | Hard | 45.2% | 55.6% | StringDynamic Programming |
| Minimum Cuts to Divide a Circle | Easy | 56.1% | 55.6% | MathGeometry |
| Spiral Matrix | Medium | 56.2% | 53.6% | ArrayMatrixSimulation |
| First Unique Character in a String | Easy | 65.1% | 51.3% | Hash TableStringQueue+1 |
| Find First and Last Position of Element in Sorted Array | Medium | 48.4% | 51.3% | ArrayBinary Search |
| Contains Duplicate II | Easy | 50.8% | 51.3% | ArrayHash TableSliding Window |
| Trapping Rain Water | Hard | 66.8% | 51.3% | ArrayTwo PointersDynamic Programming+2 |
| Pow(x, n) | Medium | 38.3% | 51.3% | MathRecursion |
| Toeplitz Matrix | Easy | 69.7% | 48.7% | ArrayMatrix |
| Merge Sorted Array | Easy | 54.4% | 48.7% | ArrayTwo PointersSorting |
| Search in Rotated Sorted Array | Medium | 44.1% | 48.7% | ArrayBinary Search |
| Bitwise ORs of Subarrays | Medium | 56.8% | 48.7% | ArrayDynamic ProgrammingBit Manipulation |
| Climbing Stairs | Easy | 53.9% | 48.7% | MathDynamic ProgrammingMemoization |
| Fibonacci Number | Easy | 73.9% | 48.7% | MathDynamic ProgrammingRecursion+1 |
| Merge Intervals | Medium | 51.2% | 48.7% | ArraySorting |
| Burst Balloons | Hard | 63.0% | 48.7% | ArrayDynamic Programming |
| Single Element in a Sorted Array | Medium | 59.2% | 45.8% | ArrayBinary Search |
| Employees Earning More Than Their Managers | Easy | 72.9% | 45.8% | Database |
| Roman to Integer | Easy | 66.3% | 45.8% | Hash TableMathString |
| Unique Paths | Medium | 66.6% | 45.8% | MathDynamic ProgrammingCombinatorics |
| Missing Number | Easy | 71.7% | 45.8% | ArrayHash TableMath+3 |
| N-Queens | Hard | 75.0% | 45.8% | ArrayBacktracking |
| Search Insert Position | Easy | 50.7% | 45.8% | ArrayBinary Search |
| Smallest Sufficient Team | Hard | 55.4% | 45.8% | ArrayDynamic ProgrammingBit Manipulation+1 |
| Plus One | Easy | 49.6% | 45.8% | ArrayMath |
| Add Binary | Easy | 57.7% | 45.8% | MathStringBit Manipulation+1 |
| Sort an Array | Medium | 55.9% | 45.8% | ArrayDivide and ConquerSorting+5 |
| House Robber | Medium | 52.9% | 42.3% | ArrayDynamic Programming |
| Squares of a Sorted Array | Easy | 73.6% | 42.3% | ArrayTwo PointersSorting |
| Add Two Numbers | Medium | 48.0% | 42.3% | Linked ListMathRecursion |
| Duplicate Emails | Easy | 73.4% | 42.3% | Database |
| Pascal's Triangle | Easy | 78.7% | 42.3% | ArrayDynamic Programming |
| Find the Duplicate Number | Medium | 64.0% | 42.3% | ArrayTwo PointersBinary Search+1 |
| Generate Parentheses | Medium | 78.3% | 42.3% | StringDynamic ProgrammingBacktracking |
| Happy Number | Easy | 59.3% | 42.3% | Hash TableMathTwo Pointers |
| Split Array With Same Average | Hard | 26.8% | 42.3% | ArrayHash TableMath+3 |
| Count Number of Pairs With Absolute Difference K | Easy | 85.3% | 42.3% | ArrayHash TableCounting |
| Middle of the Linked List | Easy | 81.6% | 42.3% | Linked ListTwo Pointers |
| Remove Nth Node From End of List | Medium | 51.0% | 42.3% | Linked ListTwo Pointers |
| Length of Last Word | Easy | 58.3% | 42.3% | String |
| Sqrt(x) | Easy | 41.4% | 42.3% | MathBinary Search |
| 4Sum | Medium | 40.0% | 42.3% | ArrayTwo PointersSorting |
| Set Matrix Zeroes | Medium | 62.5% | 42.3% | ArrayHash TableMatrix |
| Group Anagrams | Medium | 72.2% | 42.3% | ArrayHash TableString+1 |
| Min Stack | Medium | 57.7% | 42.3% | StackDesign |
| Find Minimum in Rotated Sorted Array | Medium | 53.8% | 38.0% | ArrayBinary Search |
| Product of Array Except Self | Medium | 68.6% | 38.0% | ArrayPrefix Sum |
| String to Integer (atoi) | Medium | 20.6% | 38.0% | String |
| Subsets II | Medium | 60.9% | 38.0% | ArrayBacktrackingBit Manipulation |
| Longest Palindromic Subsequence | Medium | 65.1% | 38.0% | StringDynamic Programming |
| Two Sum II - Input Array Is Sorted | Medium | 64.6% | 38.0% | ArrayTwo PointersBinary Search |
| Maximum Average Subarray I | Easy | 47.1% | 38.0% | ArraySliding Window |
| Sliding Window Maximum | Hard | 48.5% | 38.0% | ArrayQueueSliding Window+2 |
| Next Permutation | Medium | 44.8% | 38.0% | ArrayTwo Pointers |
| Partition Equal Subset Sum | Medium | 49.2% | 38.0% | ArrayDynamic Programming |
| Serialize and Deserialize Binary Tree | Hard | 60.4% | 38.0% | StringTreeDepth-First Search+3 |
| Tallest Billboard | Hard | 51.8% | 38.0% | ArrayDynamic Programming |
| Search in Rotated Sorted Array II | Medium | 39.8% | 38.0% | ArrayBinary Search |
| Product Sales Analysis I | Easy | 85.6% | 38.0% | Database |
| Reverse Words in a String | Medium | 55.6% | 38.0% | Two PointersString |
| Diameter of Binary Tree | Easy | 65.1% | 38.0% | TreeDepth-First SearchBinary Tree |
| Maximum Product of Three Numbers | Easy | 45.7% | 38.0% | ArrayMathSorting |
| Letter Combinations of a Phone Number | Medium | 65.5% | 38.0% | Hash TableStringBacktracking |
| Maximum Total Subarray Value I | Medium | | 32.6% | ArrayGreedy |
| Palindrome Linked List | Easy | 57.5% | 32.6% | Linked ListTwo PointersStack+1 |
| Remove Element | Easy | 61.4% | 32.6% | ArrayTwo Pointers |
| Customer Who Visited but Did Not Make Any Transactions | Easy | 67.6% | 32.6% | Database |
| Next Greater Element I | Easy | 75.8% | 32.6% | ArrayHash TableStack+1 |
| Longest Increasing Subsequence | Medium | 59.1% | 32.6% | ArrayBinary SearchDynamic Programming |
| Find Customer Referee | Easy | 72.6% | 32.6% | Database |
| Fizz Buzz | Easy | 75.3% | 32.6% | MathStringSimulation |
| Department Top Three Salaries | Hard | 59.9% | 32.6% | Database |
| Number of Good Pairs | Easy | 89.8% | 32.6% | ArrayHash TableMath+1 |
| Largest Number | Medium | 42.6% | 32.6% | ArrayStringGreedy+1 |
| Recyclable and Low Fat Products | Easy | 88.7% | 32.6% | Database |
| Project Employees I | Easy | 66.5% | 32.6% | Database |
| K-diff Pairs in an Array | Medium | 45.6% | 32.6% | ArrayHash TableTwo Pointers+2 |
| Jump Game II | Medium | 42.5% | 32.6% | ArrayDynamic ProgrammingGreedy |
| Binary Tree Maximum Path Sum | Hard | 42.0% | 32.6% | Dynamic ProgrammingTreeDepth-First Search+1 |
| Merge k Sorted Lists | Hard | 58.9% | 32.6% | Linked ListDivide and ConquerHeap (Priority Queue)+1 |
| First Missing Positive | Hard | 42.5% | 32.6% | ArrayHash Table |
| Find Subsequence of Length K With the Largest Sum | Easy | 57.4% | 32.6% | ArrayHash TableSorting+1 |
| Longest Subarray of 1's After Deleting One Element | Medium | 71.1% | 32.6% | ArrayDynamic ProgrammingSliding Window |
| Koko Eating Bananas | Medium | 49.7% | 32.6% | ArrayBinary Search |
| Minimum Moves to Equal Array Elements II | Medium | 61.5% | 32.6% | ArrayMathSorting |
| Water Bottles | Easy | 72.6% | 32.6% | MathSimulation |
| Maximal Rectangle | Hard | 58.1% | 32.6% | ArrayDynamic ProgrammingStack+2 |
| Delete the Middle Node of a Linked List | Medium | 59.5% | 32.6% | Linked ListTwo Pointers |
| Max Consecutive Ones | Easy | 64.6% | 32.6% | Array |
| String Compression | Medium | 59.6% | 32.6% | Two PointersString |
| Merge Two Sorted Lists | Easy | 68.0% | 32.6% | Linked ListRecursion |
| Subsets | Medium | 82.1% | 32.6% | ArrayBacktrackingBit Manipulation |
| Article Views I | Easy | 76.7% | 32.6% | Database |
| Peak Index in a Mountain Array | Medium | 66.9% | 32.6% | ArrayBinary Search |
| Ugly Number | Easy | 43.2% | 32.6% | Math |
| LRU Cache | Medium | 46.8% | 32.6% | Hash TableLinked ListDesign+1 |
| Best Time to Buy and Sell Stock II | Medium | 70.8% | 32.6% | ArrayDynamic ProgrammingGreedy |
| Third Maximum Number | Easy | 38.9% | 32.6% | ArraySorting |
| Count Primes | Medium | 35.8% | 32.6% | ArrayMathEnumeration+1 |
| Range Sum Query - Immutable | Easy | 71.4% | 32.6% | ArrayDesignPrefix Sum |
| Remove Duplicates from Sorted List | Easy | 56.3% | 32.6% | Linked List |
| Assign Cookies | Easy | 54.7% | 32.6% | ArrayTwo PointersGreedy+1 |
| Non-overlapping Intervals | Medium | 56.7% | 32.6% | ArrayDynamic ProgrammingGreedy+1 |
| Minimum Depth of Binary Tree | Easy | 52.4% | 25.2% | TreeDepth-First SearchBreadth-First Search+1 |
| Maximum Depth of Binary Tree | Easy | 77.9% | 25.2% | TreeDepth-First SearchBreadth-First Search+1 |
| Find Numbers with Even Number of Digits | Easy | 79.7% | 25.2% | ArrayMath |
| Maximum Ice Cream Bars | Medium | 74.2% | 25.2% | ArrayGreedySorting+1 |
| Find the Winner of the Circular Game | Medium | 82.2% | 25.2% | ArrayMathRecursion+2 |
| Remove Outermost Parentheses | Easy | 86.9% | 25.2% | StringStack |
| Top K Frequent Elements | Medium | 65.9% | 25.2% | ArrayHash TableDivide and Conquer+5 |
| Contiguous Array | Medium | 50.8% | 25.2% | ArrayHash TablePrefix Sum |
| Reverse Linked List | Easy | 80.3% | 25.2% | Linked ListRecursion |
| Employee Bonus | Easy | 77.2% | 25.2% | Database |
| Longest Consecutive Sequence | Medium | 47.0% | 25.2% | ArrayHash TableUnion-Find |
| Integer to English Words | Hard | 34.8% | 25.2% | MathStringRecursion |
| Unique Paths II | Medium | 44.2% | 25.2% | ArrayDynamic ProgrammingMatrix |
| The kth Factor of n | Medium | 70.2% | 25.2% | MathNumber Theory |
| Permutation in String | Medium | 48.5% | 25.2% | Hash TableTwo PointersString+1 |
| Divisor Game | Easy | 71.6% | 25.2% | MathDynamic ProgrammingBrainteaser+1 |
| Maximum Swap | Medium | 51.9% | 25.2% | MathGreedy |
| Majority Element II | Medium | 55.8% | 25.2% | ArrayHash TableSorting+1 |
| String Compression III | Medium | 67.0% | 25.2% | String |
| Maximum Sum of Distinct Subarrays With Length K | Medium | 42.8% | 25.2% | ArrayHash TableSliding Window |
| Count the Number of Fair Pairs | Medium | 52.7% | 25.2% | ArrayTwo PointersBinary Search+1 |
| Remove All Occurrences of a Substring | Medium | 78.4% | 25.2% | StringStackSimulation |
| Minimum Cost to Make at Least One Valid Path in a Grid | Hard | 70.9% | 25.2% | ArrayBreadth-First SearchGraph Theory+3 |
| Maximum Gap | Medium | 51.4% | 25.2% | ArraySortingBucket Sort+1 |
| Running Sum of 1d Array | Easy | 86.9% | 25.2% | ArrayPrefix Sum |
| Replace Employee ID With The Unique Identifier | Easy | 83.5% | 25.2% | Database |
| Maximum Nesting Depth of the Parentheses | Easy | 84.8% | 25.2% | StringStack |
| Find K Closest Elements | Medium | 49.4% | 25.2% | ArrayTwo PointersBinary Search+3 |
| Check If Array Pairs Are Divisible by k | Medium | 46.2% | 25.2% | ArrayHash TableCounting |
| Linked List Cycle II | Medium | 57.3% | 25.2% | Hash TableLinked ListTwo Pointers |
| Repeated Substring Pattern | Easy | 47.9% | 25.2% | StringString Matching |
| Rotate Image | Medium | 79.4% | 25.2% | ArrayMathMatrix |
| Convert Sorted List to Binary Search Tree | Medium | 66.0% | 25.2% | Linked ListDivide and ConquerTree+2 |
| Minimum Size Subarray Sum | Medium | 51.1% | 25.2% | ArrayBinary SearchSliding Window+1 |
| Return Length of Arguments Passed | Easy | 94.5% | 25.2% | |
| Find the Original Typed String I | Easy | 72.1% | 25.2% | String |
| Maximum Number of Events That Can Be Attended II | Hard | 63.6% | 25.2% | ArrayBinary SearchDynamic Programming+1 |
| Odd Even Linked List | Medium | 62.3% | 25.2% | Linked List |
| Valid Word | Easy | 50.9% | 25.2% | String |
| Distribute Coins in Binary Tree | Medium | 77.3% | 25.2% | TreeDepth-First SearchBinary Tree |
| Binary Search | Easy | 60.5% | 25.2% | ArrayBinary Search |
| Regular Expression Matching | Hard | 30.5% | 25.2% | StringDynamic ProgrammingRecursion |
| Longest Balanced Substring II | Medium | 42.0% | 25.2% | Hash TableStringPrefix Sum |
| Number of Islands | Medium | 63.8% | 25.2% | ArrayDepth-First SearchBreadth-First Search+2 |
| Power of Two | Easy | 49.9% | 25.2% | MathBit ManipulationRecursion |
| Longest Common Subsequence | Medium | 58.9% | 25.2% | StringDynamic Programming |
| Permutations | Medium | 81.7% | 25.2% | ArrayBacktracking |
| Zigzag Conversion | Medium | 53.6% | 25.2% | String |
| Teemo Attacking | Easy | 57.5% | 25.2% | ArraySimulation |
| Reorder List | Medium | 64.6% | 25.2% | Linked ListTwo PointersStack+1 |
| Binary Tree Inorder Traversal | Easy | 79.7% | 25.2% | StackTreeDepth-First Search+1 |
| Smallest Integer Divisible by K | Medium | 54.3% | 25.2% | Hash TableMath |
| Integer to Roman | Medium | 70.5% | 25.2% | Hash TableMathString |
| Subarray Product Less Than K | Medium | 53.9% | 25.2% | ArrayBinary SearchSliding Window+1 |
| Convert a Number to Hexadecimal | Easy | 53.3% | 25.2% | MathStringBit Manipulation |
| Continuous Subarray Sum | Medium | 31.2% | 25.2% | ArrayHash TableMath+1 |
| Department Highest Salary | Medium | 57.3% | 25.2% | Database |
| Find Smallest Letter Greater Than Target | Easy | 58.9% | 25.2% | ArrayBinary Search |
| How Many Numbers Are Smaller Than the Current Number | Easy | 87.4% | 25.2% | ArrayHash TableSorting+1 |
| Reshape the Matrix | Easy | 64.7% | 25.2% | ArrayMatrixSimulation |
| Insert Interval | Medium | 44.8% | 25.2% | Array |
| Bulb Switcher | Medium | 55.5% | 25.2% | MathBrainteaser |
| Spiral Matrix II | Medium | 74.7% | 25.2% | ArrayMatrixSimulation |
| Find All Numbers Disappeared in an Array | Easy | 63.8% | 25.2% | ArrayHash Table |
| Rotting Oranges | Medium | 58.2% | 25.2% | ArrayBreadth-First SearchMatrix |
| Binary Subarrays With Sum | Medium | 68.3% | 25.2% | ArrayHash TableSliding Window+1 |
| Remove Duplicates from Sorted Array II | Medium | 64.3% | 25.2% | ArrayTwo Pointers |
| Linked List Cycle | Easy | 53.9% | 25.2% | Hash TableLinked ListTwo Pointers |
| Managers with at Least 5 Direct Reports | Medium | 48.9% | 25.2% | Database |
| Intersection of Two Arrays II | Easy | 59.7% | 25.2% | ArrayHash TableTwo Pointers+2 |
| Count and Say | Medium | 62.3% | 25.2% | String |
| Daily Temperatures | Medium | 68.4% | 25.2% | ArrayStackMonotonic Stack |
| Longest Palindrome | Easy | 55.8% | 25.2% | Hash TableStringGreedy |
| Search a 2D Matrix | Medium | 53.6% | 25.2% | ArrayBinary SearchMatrix |
| Intersection of Two Linked Lists | Easy | 63.2% | 25.2% | Hash TableLinked ListTwo Pointers |
| Word Ladder | Hard | 44.9% | 25.2% | Hash TableStringBreadth-First Search |
| Min Cost Climbing Stairs | Easy | 68.0% | 25.2% | ArrayDynamic Programming |
| Create Hello World Function | Easy | 82.0% | 25.2% | |
| Rotate String | Easy | 65.1% | 25.2% | StringString Matching |
| Swap Nodes in Pairs | Medium | 69.0% | 25.2% | Linked ListRecursion |
| 3Sum Closest | Medium | 48.1% | 25.2% | ArrayTwo PointersSorting |
| Find Pivot Index | Easy | 62.1% | 25.2% | ArrayPrefix Sum |
| Sort Array By Parity | Easy | 76.5% | 25.2% | ArrayTwo PointersSorting |
| Subtract the Product and Sum of Digits of an Integer | Easy | 86.6% | 25.2% | Math |
| Delete Duplicate Emails | Easy | 65.6% | 25.2% | Database |
| Multiply Strings | Medium | 43.6% | 25.2% | MathStringSimulation |
| Same Tree | Easy | 66.7% | 25.2% | TreeDepth-First SearchBreadth-First Search+1 |
| Consecutive Numbers | Medium | 47.9% | 25.2% | Database |
| Largest Rectangle in Histogram | Hard | 49.4% | 25.2% | ArrayStackMonotonic Stack |