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LinkedIn SDE 1

The 175 highest-frequency questions from all time. Finish the strongest signals first.

Updated weekly · Latest source check: 13 Oct 2026ⓘLatest successful check of the sources used by this company. A check does not necessarily mean the questions changed.

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Top questions 175

Done	Question	LeetCode
Mark Max Stack completed	Max Stack	Solve
Mark Nested List Weight Sum II completed	Nested List Weight Sum II	Solve
Mark All O`one Data Structure completed	All O`one Data Structure	Solve
Mark Max Consecutive Ones III completed	Max Consecutive Ones III	Solve
Mark Shortest Word Distance II completed	Shortest Word Distance II	Solve
Mark Find the Celebrity completed	Find the Celebrity	Solve
Mark Maximum Subarray completed	Maximum Subarray	Solve
Mark Nested List Weight Sum completed	Nested List Weight Sum	Solve
Mark Valid Parentheses completed	Valid Parentheses	Solve
Mark Word Ladder completed	Word Ladder	Solve
Mark Find Leaves of Binary Tree completed	Find Leaves of Binary Tree	Solve
Mark Insert Delete GetRandom O(1) completed	Insert Delete GetRandom O(1)	Solve
Mark Can Place Flowers completed	Can Place Flowers	Solve
Mark Number of Islands completed	Number of Islands	Solve
Mark Letter Combinations of a Phone Number completed	Letter Combinations of a Phone Number	Solve
Mark Maximum Product Subarray completed	Maximum Product Subarray	Solve
Mark Binary Tree Upside Down completed	Binary Tree Upside Down	Solve
Mark Find First and Last Position of Element in Sorted Array completed	Find First and Last Position of Element in Sorted Array	Solve
Mark Partition to K Equal Sum Subsets completed	Partition to K Equal Sum Subsets	Solve
Mark Pow(x, n) completed	Pow(x, n)	Solve
Mark Lowest Common Ancestor of a Binary Search Tree completed	Lowest Common Ancestor of a Binary Search Tree	Solve
Mark Minimum Window Substring completed	Minimum Window Substring	Solve
Mark Search in Rotated Sorted Array completed	Search in Rotated Sorted Array	Solve
Mark Sort Transformed Array completed	Sort Transformed Array	Solve
Mark LRU Cache completed	LRU Cache	Solve
Mark Paint House completed	Paint House	Solve
Mark Bulb Switcher completed	Bulb Switcher	Solve
Mark Exclusive Time of Functions completed	Exclusive Time of Functions	Solve
Mark Maximum Depth of Binary Tree completed	Maximum Depth of Binary Tree	Solve
Mark Serialize and Deserialize Binary Tree completed	Serialize and Deserialize Binary Tree	Solve
Mark Symmetric Tree completed	Symmetric Tree	Solve
Mark Isomorphic Strings completed	Isomorphic Strings	Solve
Mark Lowest Common Ancestor of a Binary Tree completed	Lowest Common Ancestor of a Binary Tree	Solve
Mark Closest Binary Search Tree Value II completed	Closest Binary Search Tree Value II	Solve
Mark Shortest Word Distance completed	Shortest Word Distance	Solve
Mark Find Smallest Letter Greater Than Target completed	Find Smallest Letter Greater Than Target	Solve
Mark Random Pick with Weight completed	Random Pick with Weight	Solve
Mark Second Minimum Node In a Binary Tree completed	Second Minimum Node In a Binary Tree	Solve
Mark Design Bounded Blocking Queue completed	Design Bounded Blocking Queue	Solve
Mark Insert Delete GetRandom O(1) - Duplicates allowed completed	Insert Delete GetRandom O(1) - Duplicates allowed	Solve
Mark Kth Largest Element in an Array completed	Kth Largest Element in an Array	Solve
Mark Lowest Common Ancestor of a Binary Tree III completed	Lowest Common Ancestor of a Binary Tree III	Solve
Mark Permutations completed	Permutations	Solve
Mark Factor Combinations completed	Factor Combinations	Solve
Mark Merge Intervals completed	Merge Intervals	Solve
Mark Repeated DNA Sequences completed	Repeated DNA Sequences	Solve
Mark Count Integers in Intervals completed	Count Integers in Intervals	Solve
Mark Longest Palindromic Subsequence completed	Longest Palindromic Subsequence	Solve
Mark Max Points on a Line completed	Max Points on a Line	Solve
Mark Valid Number completed	Valid Number	Solve
Mark Kth Smallest Product of Two Sorted Arrays completed	Kth Smallest Product of Two Sorted Arrays	Solve
Mark Maximize Subarrays After Removing One Conflicting Pair completed	Maximize Subarrays After Removing One Conflicting Pair	Solve
Mark Can I Win completed	Can I Win	Solve
Mark Valid Perfect Square completed	Valid Perfect Square	Solve
Mark Find K Pairs with Smallest Sums completed	Find K Pairs with Smallest Sums	Solve
Mark Robot Room Cleaner completed	Robot Room Cleaner	Solve
Mark Evaluate Reverse Polish Notation completed	Evaluate Reverse Polish Notation	Solve
Mark Flatten Nested List Iterator completed	Flatten Nested List Iterator	Solve
Mark Lowest Common Ancestor of a Binary Tree II completed	Lowest Common Ancestor of a Binary Tree II	Solve
Mark Merge Two Sorted Lists completed	Merge Two Sorted Lists	Solve
Mark Shortest Word Distance III completed	Shortest Word Distance III	Solve
Mark Two Sum completed	Two Sum	Solve
Mark Binary Tree Level Order Traversal completed	Binary Tree Level Order Traversal	Solve
Mark Building H2O completed	Building H2O	Solve
Mark Insert Interval completed	Insert Interval	Solve
Mark Merge k Sorted Lists completed	Merge k Sorted Lists	Solve
Mark Merge Two Binary Trees completed	Merge Two Binary Trees	Solve
Mark Possible Bipartition completed	Possible Bipartition	Solve
Mark Sparse Matrix Multiplication completed	Sparse Matrix Multiplication	Solve
Mark Accounts Merge completed	Accounts Merge	Solve
Mark Binary Tree Zigzag Level Order Traversal completed	Binary Tree Zigzag Level Order Traversal	Solve
Mark Course Schedule II completed	Course Schedule II	Solve
Mark Edit Distance completed	Edit Distance	Solve
Mark House Robber completed	House Robber	Solve
Mark Intersection of Two Linked Lists completed	Intersection of Two Linked Lists	Solve
Mark Palindromic Substrings completed	Palindromic Substrings	Solve
Mark Permutations II completed	Permutations II	Solve
Mark Product of Array Except Self completed	Product of Array Except Self	Solve
Mark Text Justification completed	Text Justification	Solve
Mark Article Views I completed	Article Views I	Solve
Mark Article Views II completed	Article Views II	Solve
Mark Binary Search Tree Iterator completed	Binary Search Tree Iterator	Solve
Mark Count Different Palindromic Subsequences completed	Count Different Palindromic Subsequences	Solve
Mark Count Sequences to K completed	Count Sequences to K	Solve
Mark Create Binary Tree From Descriptions completed	Create Binary Tree From Descriptions	Solve
Mark Find K Closest Elements completed	Find K Closest Elements	Solve
Mark Find Largest Value in Each Tree Row completed	Find Largest Value in Each Tree Row	Solve
Mark Graph Valid Tree completed	Graph Valid Tree	Solve
Mark Maximize Total Tastiness of Purchased Fruits completed	Maximize Total Tastiness of Purchased Fruits	Solve
Mark Maximum Number of Non-overlapping Palindrome Substrings completed	Maximum Number of Non-overlapping Palindrome Substrings	Solve
Mark Minimum Deletions to Make Array Divisible completed	Minimum Deletions to Make Array Divisible	Solve
Mark Minimum Increase to Maximize Special Indices completed	Minimum Increase to Maximize Special Indices	Solve
Mark New Users Daily Count completed	New Users Daily Count	Solve
Mark Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold completed	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Solve
Mark Rotate List completed	Rotate List	Solve
Mark Sqrt(x) completed	Sqrt(x)	Solve
Mark Sum of All Odd Length Subarrays completed	Sum of All Odd Length Subarrays	Solve
Mark Sum of Square Numbers completed	Sum of Square Numbers	Solve
Mark Time to Cross a Bridge completed	Time to Cross a Bridge	Solve
Mark Two Sum III - Data structure design completed	Two Sum III - Data structure design	Solve
Mark User Purchase Platform completed	User Purchase Platform	Solve
Mark Validate Stack Sequences completed	Validate Stack Sequences	Solve
Mark Number of Connected Components in an Undirected Graph completed	Number of Connected Components in an Undirected Graph	Solve
Mark Max Area of Island completed	Max Area of Island	Solve
Mark Paint House II completed	Paint House II	Solve
Mark Valid Triangle Number completed	Valid Triangle Number	Solve
Mark Design HashMap completed	Design HashMap	Solve
Mark Longest Valid Parentheses completed	Longest Valid Parentheses	Solve
Mark Min Stack completed	Min Stack	Solve
Mark Reverse Words in a String completed	Reverse Words in a String	Solve
Mark Shuffle an Array completed	Shuffle an Array	Solve
Mark Smallest Range Covering Elements from K Lists completed	Smallest Range Covering Elements from K Lists	Solve
Mark Valid Parenthesis String completed	Valid Parenthesis String	Solve
Mark Cinema Seat Allocation completed	Cinema Seat Allocation	Solve
Mark Closest Leaf in a Binary Tree completed	Closest Leaf in a Binary Tree	Solve
Mark Combination Sum II completed	Combination Sum II	Solve
Mark Delete Node in a BST completed	Delete Node in a BST	Solve
Mark Implement Rand10() Using Rand7() completed	Implement Rand10() Using Rand7()	Solve
Mark Integer to Roman completed	Integer to Roman	Solve
Mark Is Graph Bipartite? completed	Is Graph Bipartite?	Solve
Mark LFU Cache completed	LFU Cache	Solve
Mark Longest Substring Without Repeating Characters completed	Longest Substring Without Repeating Characters	Solve
Mark Number of Divisible Triplet Sums completed	Number of Divisible Triplet Sums	Solve
Mark Process Tasks Using Servers completed	Process Tasks Using Servers	Solve
Mark Same Tree completed	Same Tree	Solve
Mark Word Ladder II completed	Word Ladder II	Solve
Mark 01 Matrix completed	01 Matrix	Solve
Mark Best Meeting Point completed	Best Meeting Point	Solve
Mark Combination Sum completed	Combination Sum	Solve
Mark Course Schedule completed	Course Schedule	Solve
Mark Dot Product of Two Sparse Vectors completed	Dot Product of Two Sparse Vectors	Solve
Mark House Robber II completed	House Robber II	Solve
Mark Invert Binary Tree completed	Invert Binary Tree	Solve
Mark K Closest Points to Origin completed	K Closest Points to Origin	Solve
Mark Koko Eating Bananas completed	Koko Eating Bananas	Solve
Mark Making A Large Island completed	Making A Large Island	Solve
Mark Maximize Sum of Weights after Edge Removals completed	Maximize Sum of Weights after Edge Removals	Solve
Mark Merge Sorted Array completed	Merge Sorted Array	Solve
Mark Minimum Knight Moves completed	Minimum Knight Moves	Solve
Mark Open the Lock completed	Open the Lock	Solve
Mark Reorder List completed	Reorder List	Solve
Mark Reverse Integer completed	Reverse Integer	Solve
Mark Rotting Oranges completed	Rotting Oranges	Solve
Mark Subarray Sum Equals K completed	Subarray Sum Equals K	Solve
Mark Task Scheduler completed	Task Scheduler	Solve
Mark Unique Paths completed	Unique Paths	Solve
Mark Word Break completed	Word Break	Solve
Mark All Nodes Distance K in Binary Tree completed	All Nodes Distance K in Binary Tree	Solve
Mark Convert to Base -2 completed	Convert to Base -2	Solve
Mark Expression Add Operators completed	Expression Add Operators	Solve
Mark Find Minimum in Rotated Sorted Array completed	Find Minimum in Rotated Sorted Array	Solve
Mark Find the Number of Subarrays Where Boundary Elements Are Maximum completed	Find the Number of Subarrays Where Boundary Elements Are Maximum	Solve
Mark First Unique Character in a String completed	First Unique Character in a String	Solve
Mark Flatten a Multilevel Doubly Linked List completed	Flatten a Multilevel Doubly Linked List	Solve
Mark H-Index completed	H-Index	Solve
Mark Insert into a Binary Search Tree completed	Insert into a Binary Search Tree	Solve
Mark Integer to English Words completed	Integer to English Words	Solve
Mark Kth Smallest Element in a BST completed	Kth Smallest Element in a BST	Solve
Mark Largest Color Value in a Directed Graph completed	Largest Color Value in a Directed Graph	Solve
Mark Largest Rectangle in Histogram completed	Largest Rectangle in Histogram	Solve
Mark Linked List Cycle completed	Linked List Cycle	Solve
Mark Long Pressed Name completed	Long Pressed Name	Solve
Mark Longest Consecutive Sequence completed	Longest Consecutive Sequence	Solve
Mark Longest Palindromic Substring completed	Longest Palindromic Substring	Solve
Mark Longest String Chain completed	Longest String Chain	Solve
Mark Maximum Number of Occurrences of a Substring completed	Maximum Number of Occurrences of a Substring	Solve
Mark Number of Visible People in a Queue completed	Number of Visible People in a Queue	Solve
Mark Paint House III completed	Paint House III	Solve
Mark Palindrome Linked List completed	Palindrome Linked List	Solve
Mark Partition Labels completed	Partition Labels	Solve
Mark Reverse Linked List completed	Reverse Linked List	Solve
Mark Robot Bounded In Circle completed	Robot Bounded In Circle	Solve
Mark Search in Rotated Sorted Array II completed	Search in Rotated Sorted Array II	Solve
Mark The Maze completed	The Maze	Solve
Mark Validate Binary Search Tree completed	Validate Binary Search Tree	Solve