| Two Sum | Easy | 57.1% | 100.0% | ArrayHash Table |
| Climbing Stairs | Easy | 53.9% | 87.5% | MathDynamic ProgrammingMemoization |
| Best Time to Buy and Sell Stock | Easy | 56.4% | 87.5% | ArrayDynamic Programming |
| Longest Substring Without Repeating Characters | Medium | 38.5% | 75.0% | Hash TableStringSliding Window |
| Longest Palindromic Substring | Medium | 37.3% | 75.0% | Two PointersStringDynamic Programming |
| Reverse Integer | Medium | 31.5% | 75.0% | Math |
| Palindrome Number | Easy | 60.2% | 75.0% | Math |
| Sum of Values at Indices With K Set Bits | Easy | 86.1% | 75.0% | ArrayBit Manipulation |
| Maximum Subarray | Medium | 53.0% | 75.0% | ArrayDivide and ConquerDynamic Programming |
| Count Tested Devices After Test Operations | Easy | 78.8% | 75.0% | ArraySimulationCounting |
| Find Subsequence of Length K With the Largest Sum | Easy | 57.4% | 75.0% | ArrayHash TableSorting+1 |
| Maximum Area of Longest Diagonal Rectangle | Easy | 45.9% | 75.0% | Array |
| Rotate Array | Medium | 44.4% | 75.0% | ArrayMathTwo Pointers |
| Happy Number | Easy | 59.2% | 75.0% | Hash TableMathTwo Pointers |
| Ant on the Boundary | Easy | 74.2% | 75.0% | ArraySimulationPrefix Sum |
| Permutation Difference between Two Strings | Easy | 87.7% | 75.0% | Hash TableString |
| Delete and Earn | Medium | 57.1% | 75.0% | ArrayHash TableDynamic Programming |
| Minimum Right Shifts to Sort the Array | Easy | 57.3% | 75.0% | Array |
| Majority Element | Easy | 66.1% | 75.0% | ArrayHash TableDivide and Conquer+2 |
| Shortest Palindrome | Hard | 41.8% | 75.0% | StringRolling HashString Matching+1 |
| Letter Combinations of a Phone Number | Medium | 65.5% | 75.0% | Hash TableStringBacktracking |
| Smallest Divisible Digit Product I | Easy | 64.4% | 75.0% | MathEnumeration |
| Smallest Divisible Digit Product II | Hard | 14.4% | 75.0% | MathStringBacktracking+2 |
| Minimum Number of Operations to Have Distinct Elements | Medium | 42.0% | 75.0% | ArrayHash Table |
| Container With Most Water | Medium | 59.5% | 62.5% | ArrayTwo PointersGreedy |
| Longest Common Prefix | Easy | 47.1% | 62.5% | ArrayStringTrie |
| Valid Parentheses | Easy | 43.7% | 62.5% | StringStack |
| Median of Two Sorted Arrays | Hard | 45.9% | 62.5% | ArrayBinary SearchDivide and Conquer |
| Remove Duplicates from Sorted Array | Easy | 62.2% | 62.5% | ArrayTwo Pointers |
| Merge Sorted Array | Easy | 54.4% | 62.5% | ArrayTwo PointersSorting |
| Reverse Words in a String | Medium | 55.5% | 62.5% | Two PointersString |
| Find Peak Element | Medium | 46.8% | 62.5% | ArrayBinary Search |
| Largest Number | Medium | 42.6% | 62.5% | ArrayStringGreedy+1 |
| Count Primes | Medium | 35.7% | 62.5% | ArrayMathEnumeration+1 |
| Contains Duplicate | Easy | 64.1% | 62.5% | ArrayHash TableSorting |
| Bulb Switcher | Medium | 55.5% | 62.5% | MathBrainteaser |
| Plus One | Easy | 49.5% | 62.5% | ArrayMath |
| Max Consecutive Ones | Easy | 64.6% | 62.5% | Array |
| Koko Eating Bananas | Medium | 49.7% | 62.5% | ArrayBinary Search |
| Water Bottles | Easy | 72.6% | 62.5% | MathSimulation |
| Move Zeroes | Easy | 63.5% | 62.5% | ArrayTwo Pointers |
| Add Two Numbers | Medium | 47.9% | 50.0% | Linked ListMathRecursion |
| Roman to Integer | Easy | 66.2% | 50.0% | Hash TableMathString |
| 3Sum | Medium | 38.6% | 50.0% | ArrayTwo PointersSorting |
| Find First and Last Position of Element in Sorted Array | Medium | 48.3% | 50.0% | ArrayBinary Search |
| Rotate Image | Medium | 79.3% | 50.0% | ArrayMathMatrix |
| Spiral Matrix | Medium | 56.1% | 50.0% | ArrayMatrixSimulation |
| Merge Intervals | Medium | 51.1% | 50.0% | ArraySorting |
| Maximum Depth of Binary Tree | Easy | 77.9% | 50.0% | TreeDepth-First SearchBreadth-First Search+1 |
| Pascal's Triangle | Easy | 78.7% | 50.0% | ArrayDynamic Programming |
| Second Highest Salary | Medium | 46.3% | 50.0% | Database |
| Valid Anagram | Easy | 67.8% | 50.0% | Hash TableStringSorting |
| Perfect Squares | Medium | 56.3% | 50.0% | MathDynamic ProgrammingBreadth-First Search |
| Longest Increasing Subsequence | Medium | 59.0% | 50.0% | ArrayBinary SearchDynamic Programming |
| Integer Break | Medium | 61.8% | 50.0% | MathDynamic Programming |
| Fibonacci Number | Easy | 73.9% | 50.0% | MathDynamic ProgrammingRecursion+1 |
| Sort Array by Increasing Frequency | Easy | 80.7% | 50.0% | ArrayHash TableSorting |
| House Robber | Medium | 52.9% | 50.0% | ArrayDynamic Programming |
| Assign Cookies | Easy | 54.7% | 50.0% | ArrayTwo PointersGreedy+1 |
| Next Greater Element I | Easy | 75.7% | 50.0% | ArrayHash TableStack+1 |
| Reverse Vowels of a String | Easy | 60.6% | 50.0% | Two PointersString |
| Coin Change | Medium | 47.9% | 50.0% | ArrayDynamic ProgrammingBreadth-First Search |
| Nth Digit | Medium | 37.1% | 50.0% | MathBinary Search |
| Kth Largest Element in an Array | Medium | 68.8% | 50.0% | ArrayDivide and ConquerSorting+2 |
| Find the Winner of the Circular Game | Medium | 82.2% | 50.0% | ArrayMathRecursion+2 |
| Maximum Width Ramp | Medium | 55.8% | 50.0% | ArrayTwo PointersStack+1 |
| Separate Black and White Balls | Medium | 64.0% | 50.0% | Two PointersStringGreedy |
| Rising Temperature | Easy | 51.0% | 50.0% | Database |
| Middle of the Linked List | Easy | 81.5% | 50.0% | Linked ListTwo Pointers |
| Contains Duplicate II | Easy | 50.8% | 50.0% | ArrayHash TableSliding Window |
| String to Integer (atoi) | Medium | 20.6% | 50.0% | String |
| Reverse String | Easy | 80.5% | 50.0% | Two PointersString |
| Number of Islands | Medium | 63.8% | 50.0% | ArrayDepth-First SearchBreadth-First Search+2 |
| Average Time of Process per Machine | Easy | 66.9% | 50.0% | Database |
| Remove Nth Node From End of List | Medium | 51.0% | 50.0% | Linked ListTwo Pointers |
| Intersection of Two Arrays | Easy | 77.5% | 50.0% | ArrayHash TableTwo Pointers+2 |
| Sort Characters By Frequency | Medium | 75.1% | 50.0% | Hash TableStringSorting+3 |
| Employees Earning More Than Their Managers | Easy | 72.8% | 50.0% | Database |
| Count Partitions with Even Sum Difference | Easy | 85.2% | 50.0% | ArrayMathPrefix Sum |
| Edit Distance | Medium | 60.1% | 37.5% | StringDynamic Programming |
| Valid Palindrome | Easy | 52.8% | 37.5% | Two PointersString |
| Candy | Hard | 47.9% | 37.5% | ArrayGreedy |
| Product of Array Except Self | Medium | 68.6% | 37.5% | ArrayPrefix Sum |
| Perfect Number | Easy | 47.9% | 37.5% | Math |
| Intersection of Two Linked Lists | Easy | 63.2% | 37.5% | Hash TableLinked ListTwo Pointers |
| Reverse Linked List | Easy | 80.2% | 37.5% | Linked ListRecursion |
| Peak Index in a Mountain Array | Medium | 66.9% | 37.5% | ArrayBinary Search |
| Integer to Roman | Medium | 70.4% | 37.5% | Hash TableMathString |
| Single Number II | Medium | 66.7% | 37.5% | ArrayBit Manipulation |
| Search a 2D Matrix | Medium | 53.5% | 37.5% | ArrayBinary SearchMatrix |
| Daily Temperatures | Medium | 68.3% | 37.5% | ArrayStackMonotonic Stack |
| Unique Paths | Medium | 66.5% | 37.5% | MathDynamic ProgrammingCombinatorics |
| 01 Matrix | Medium | 53.3% | 37.5% | ArrayDynamic ProgrammingBreadth-First Search+1 |
| Department Top Three Salaries | Hard | 59.8% | 37.5% | Database |
| Number of Good Pairs | Easy | 89.8% | 37.5% | ArrayHash TableMath+1 |
| Maximum Number of Balls in a Box | Easy | 74.7% | 37.5% | Hash TableMathCounting |
| Maximum Number of Moves in a Grid | Medium | 58.8% | 37.5% | ArrayDynamic ProgrammingMatrix |
| Find the Difference | Easy | 60.1% | 37.5% | Hash TableStringBit Manipulation+1 |
| Search Insert Position | Easy | 50.7% | 37.5% | ArrayBinary Search |
| Find All Anagrams in a String | Medium | 53.3% | 37.5% | Hash TableStringSliding Window |
| Minimum Insertion Steps to Make a String Palindrome | Hard | 73.6% | 37.5% | StringDynamic Programming |
| Isomorphic Strings | Easy | 48.0% | 37.5% | Hash TableString |
| Single Number | Easy | 77.3% | 37.5% | ArrayBit Manipulation |
| First Unique Character in a String | Easy | 65.0% | 37.5% | Hash TableStringQueue+1 |
| Regular Expression Matching | Hard | 30.4% | 37.5% | StringDynamic ProgrammingRecursion |
| Generate Parentheses | Medium | 78.2% | 37.5% | StringDynamic ProgrammingBacktracking |
| Find the Duplicate Number | Medium | 64.0% | 37.5% | ArrayTwo PointersBinary Search+1 |
| Palindrome Partitioning | Medium | 73.7% | 37.5% | StringDynamic ProgrammingBacktracking |
| Divide Nodes Into the Maximum Number of Groups | Hard | 67.0% | 37.5% | Depth-First SearchBreadth-First SearchUnion-Find+1 |
| Maximum Product of Three Numbers | Easy | 45.7% | 37.5% | ArrayMathSorting |
| Longest Common Subsequence | Medium | 58.9% | 37.5% | StringDynamic Programming |
| Nth Highest Salary | Medium | 38.8% | 37.5% | Database |
| Reverse Bits | Easy | 67.7% | 37.5% | Divide and ConquerBit Manipulation |
| Convert Sorted Array to Binary Search Tree | Easy | 75.2% | 37.5% | ArrayDivide and ConquerTree+2 |
| Longest Palindrome | Easy | 55.8% | 37.5% | Hash TableStringGreedy |
| Linked List Cycle | Easy | 53.9% | 37.5% | Hash TableLinked ListTwo Pointers |
| Largest Odd Number in String | Easy | 66.9% | 37.5% | MathStringGreedy |
| Find the Difference of Two Arrays | Easy | 81.3% | 37.5% | ArrayHash Table |
| Permutation in String | Medium | 48.4% | 37.5% | Hash TableTwo PointersString+1 |
| Binary Tree Zigzag Level Order Traversal | Medium | 63.1% | 37.5% | TreeBreadth-First SearchBinary Tree |
| Longest Palindromic Subsequence | Medium | 65.1% | 37.5% | StringDynamic Programming |
| Reverse String II | Easy | 53.3% | 37.5% | Two PointersString |
| Rotate String | Easy | 65.1% | 37.5% | StringString Matching |
| Best Time to Buy and Sell Stock II | Medium | 70.7% | 37.5% | ArrayDynamic ProgrammingGreedy |
| Remove K Digits | Medium | 36.4% | 37.5% | StringStackGreedy+1 |
| Merge k Sorted Lists | Hard | 58.8% | 37.5% | Linked ListDivide and ConquerHeap (Priority Queue)+1 |
| Trapping Rain Water | Hard | 66.8% | 37.5% | ArrayTwo PointersDynamic Programming+2 |
| Add Two Integers | Easy | 87.9% | 37.5% | Math |
| 4Sum | Medium | 40.0% | 37.5% | ArrayTwo PointersSorting |
| Students and Examinations | Easy | 60.9% | 37.5% | Database |
| Contiguous Array | Medium | 50.8% | 37.5% | ArrayHash TablePrefix Sum |
| Longest Valid Parentheses | Hard | 38.0% | 37.5% | StringDynamic ProgrammingStack |
| Sum of Subarray Minimums | Medium | 38.3% | 37.5% | ArrayDynamic ProgrammingStack+1 |
| Sort an Array | Medium | 55.9% | 37.5% | ArrayDivide and ConquerSorting+5 |
| Word Search | Medium | 46.8% | 37.5% | ArrayStringBacktracking+2 |
| Pow(x, n) | Medium | 38.2% | 37.5% | MathRecursion |
| Search in Rotated Sorted Array II | Medium | 39.7% | 37.5% | ArrayBinary Search |
| Rank Scores | Medium | 67.1% | 37.5% | Database |
| Find the Highest Altitude | Easy | 83.9% | 37.5% | ArrayPrefix Sum |
| Rotate Function | Medium | 45.4% | 37.5% | ArrayMathDynamic Programming |
| Subarray Sum Equals K | Medium | 46.8% | 37.5% | ArrayHash TablePrefix Sum |
| Find Pivot Index | Easy | 62.1% | 37.5% | ArrayPrefix Sum |
| Squares of a Sorted Array | Easy | 73.6% | 37.5% | ArrayTwo PointersSorting |
| Binary Tree Right Side View | Medium | 69.5% | 37.5% | TreeDepth-First SearchBreadth-First Search+1 |