Understand the essential patterns behind common coding interview questions — without having to drill endless problem sets

Identify the underlying pattern of each interview question by assessing the problem statement (and learn the tricks required to solve it)

Practice your skills in a hands-on, setup-free coding environment

Learn to efficiently evaluate the tradeoffs between time and space complexity in different solutions

Develop a flexible conceptual framework for solving any question, by connecting problem characteristics, solution techniques, and coding design patterns

Understand the essential patterns behind common coding interview questions — without having to drill endless problem sets

Identify the underlying pattern of each interview question by assessing the problem statement (and learn the tricks required to solve it)

Practice your skills in a hands-on, setup-free coding environment

Learn to efficiently evaluate the tradeoffs between time and space complexity in different solutions

Develop a flexible conceptual framework for solving any question, by connecting problem characteristics, solution techniques, and coding design patterns

With thousands of potential questions to account for, preparing for the coding interview can feel like an impossible challenge. Yet with a strategic approach, coding interview prep doesn’t have to take more than a few weeks. Stop drilling endless sets of practice problems, and prepare ...

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Hands-on coding environments

You don’t get better at swimming by watching others. Coding is no different. Practice as you learn with live code environments inside your browser.

Faster than videos

Videos are holding you back. The average video tutorial is spoken at 150 words per minute, while you can read at 250. That‘s why our courses are text-based.

No set-up required

Start learning immediately instead of fiddling with SDKs and IDEs. It‘s all on the cloud.

Progress you can show

Built in assessments let you test your skills. Completion certificates let you show them off.

Two Pointers: IntroductionValid PalindromeSolution: Valid PalindromeSum of Three ValuesSolution: Sum of Three ValuesReverse Words in a StringSolution: Reverse Words in a StringValid Palindrome II

Fast and Slow Pointers: IntroductionHappy NumberSolution: Happy NumberLinked List CycleSolution: Linked List CycleMiddle of the Linked ListSolution: Middle of the Linked ListCircular Array LoopSolution: Circular Array LoopPalindrome Linked ListSolution: Palindrome Linked List

Sliding Window: IntroductionFind Maximum in Sliding WindowSolution: Find Maximum in Sliding WindowMinimum Window SubsequenceSolution: Minimum Window SubsequenceRepeated DNA SequencesSolution: Repeated DNA SequencesMinimum Window SubstringSolution: Minimum Window SubstringLongest Substring without Repeating CharactersSolution: Longest Substring without Repeating CharactersMinimum Size Subarray SumSolution: Minimum Size Subarray SumBest Time to Buy and Sell Stock

Merge Intervals: IntroductionMerge IntervalsSolution: Merge IntervalsInsert IntervalSolution: Insert IntervalInterval List IntersectionsSolution: Interval List IntersectionsEmployee Free TimeSolution: Employee Free TimeMeeting Rooms II

In-place Reversal of a Linked List: IntroductionReverse Linked ListSolution: Reverse Linked ListReverse Nodes in k-GroupSolution: Reverse Nodes in k-GroupReverse Linked List IISolution: Reverse Linked List IIReorder ListSolution: Reorder ListSwapping Nodes in a Linked ListSolution: Swapping Nodes in a Linked ListReverse Nodes In Even Length GroupsSolution: Reverse Nodes in Even Length GroupsSwap Nodes in Pairs

Two Heaps: IntroductionMaximize CapitalSolution: Maximize CapitalFind Median from a Data StreamSolution: Find Median from a Data StreamSliding Window MedianSolution: Sliding Window MedianSchedule Tasks on Minimum MachinesSolution: Schedule Tasks on Minimum Machines

K-way Merge: IntroductionMerge Sorted ArraySolution: Merge Sorted ArrayKth Smallest Number in M Sorted ListsSolution: Kth Smallest Number in M Sorted ListsFind K Pairs with Smallest SumsSolution: Find K Pairs with Smallest SumsMerge K Sorted ListsSolution: Merge K Sorted ListsKth Smallest Element in a Sorted MatrixSolution: Kth Smallest Element in a Sorted MatrixMedian of Two Sorted Arrays

Top K Elements: IntroductionKth Largest Element in a StreamSolution: Kth Largest Element in a StreamReorganize StringSolution: Reorganize StringK Closest Points to OriginSolution: K Closest Points to OriginTop K Frequent ElementsSolution: Top K Frequent ElementsKth Largest Element in an ArraySolution: Kth Largest Element in an ArrayKth Smallest Element in a BST

Modified Binary Search: IntroductionSearch in Rotated Sorted ArraySolution: Search in Rotated Sorted ArrayFirst Bad VersionSolution: First Bad VersionRandom Pick with WeightSolution: Random Pick with WeightFind K Closest ElementsSolution: Find K Closest ElementsSingle Element in a Sorted ArraySolution: Single Element in a Sorted ArraySearch in Rotated Sorted Array II

Subsets: IntroductionSubsetsSolution: SubsetsPermutationsSolution: PermutationsLetter Combinations of a Phone NumberSolution: Letter Combinations of a Phone NumberGenerate ParenthesesSolution: Generate ParenthesesFind K-Sum Subsets

Greedy Techniques: IntroductionJump Game ISolution: Jump Game IBoats to Save PeopleSolution: Boats to Save PeopleGas StationsSolution: Gas StationsTwo City SchedulingSolution: Two City SchedulingJump Game II

Backtracking: IntroductionN-QueensSolution: N-QueensWord SearchSolution: Word SearchHouse Robber IIISolution: House Robber IIIRestore IP AddressesSolution: Restore IP AddressesSudoku SolverMatchsticks to Square

Dynamic Programming: Introduction0/1 KnapsackSolution: 0/1 KnapsackCoin ChangeSolution: Coin ChangeN-th Tribonacci NumberSolution: N-th Tribonacci NumberPartition Equal Subset SumSolution: Partition Equal Subset SumWord Break IISolution: Word Break IIMinimum Number of Refueling StopsSolution: Minimum Number of Refueling StopsClimbing Stairs

Cyclic Sort: IntroductionMissing NumberSolution: Missing NumberFirst Missing PositiveSolution: First Missing PositiveFind The Duplicate NumberSolution: Find The Duplicate NumberFind the Corrupt PairSolution: Find the Corrupt PairFind the First K Missing Positive Numbers

Topological Sort: IntroductionCompilation OrderSolution: Compilation OrderAlien DictionarySolution: Alien DictionaryVerifying an Alien DictionarySolution: Verifying an Alien DictionaryCourse Schedule IISolution: Course Schedule IICourse ScheduleSolution: Course ScheduleFind All Possible Recipes from Given Supplies

Stacks: IntroductionBasic CalculatorSolution: Basic CalculatorRemove All Adjacent Duplicates In StringSolution: Remove All Adjacent Duplicates In StringMinimum Remove to Make Valid ParenthesesSolution: Minimum Remove to Make Valid ParenthesesExclusive Execution Time of FunctionsSolution: Exclusive Execution Time of FunctionsFlatten Nested List IteratorSolution: Flatten Nested List IteratorValid Parentheses

Tree Depth-first Search: IntroductionFlatten Binary Tree to Linked ListSolution: Flatten Binary Tree to Linked ListDiameter of Binary TreeSolution: Diameter of Binary TreeSerialize and Deserialize Binary TreeSolution: Serialize and Deserialize Binary TreeInvert Binary TreeSolution: Invert Binary TreeBinary Tree Maximum Path SumSolution: Binary Tree Maximum Path SumMaximum Depth of Binary Tree

Tree Breadth-first Search: IntroductionLevel Order Traversal of Binary TreeSolution: Level Order Traversal of Binary TreeBinary Tree Zigzag Level Order TraversalSolution: Binary Tree Zigzag Level Order TraversalPopulating Next Right Pointers in Each NodeSolution: Populating Next Right Pointers in Each NodeVertical Order Traversal of a Binary TreeSolution: Vertical Order Traversal of a Binary TreeConnect All Siblings of a Binary Tree

Trie: IntroductionImplement TrieSolution: Implement TrieSearch Suggestions SystemSolution: Search Suggestions SystemReplace WordsSolution: Replace WordsDesign Add and Search Words Data StructureSolution: Design Add and Search Words Data StructureWord Search IISolution: Word Search IILexicographical Numbers

Hash Maps: IntroductionDesign HashMapSolution: Design HashMapFraction to Recurring DecimalSolution: Fraction to Recurring DecimalLogger Rate LimiterSolution: Logger Rate LimiterNext Greater ElementSolution: Next Greater ElementIsomorphic StringsSolution: Isomorphic StringsLongest Palindrome

Knowing What to Track: IntroductionPalindrome PermutationSolution: Palindrome PermutationDesign Tic-Tac-ToeSolution: Design Tic-Tac-ToeGroup AnagramsSolution: Group AnagramsMaximum Frequency StackSolution: Maximum Frequency StackFirst Unique Character in a StringSolution: First Unique Character in a StringFind All Anagrams in a StringSolution: Find All Anagrams in a StringRansom Note

Union Find: IntroductionRedundant ConnectionSolution: Redundant ConnectionNumber of IslandsSolution: Number of IslandsLast Day Where You Can Still CrossSolution: Last Day Where You Can Still CrossRegions Cut by SlashesSolution: Regions Cut by SlashesMinimize Malware SpreadSolution: Minimize Malware SpreadEvaluate Division

Custom Data Structures: IntroductionSnapshot ArraySolution: Snapshot ArrayTime-Based Key-Value StoreSolution: Time-Based Key-Value StoreImplement LRU CacheSolution: Implement LRU CacheInsert Delete GetRandom O(1)Solution: Insert Delete GetRandom O(1)Min StackSolution: Min StackLFU Cache

Bitwise Manipulation: IntroductionFind the DifferenceSolution: Find the DifferenceComplement of Base 10 NumberSolution: Complement of Base 10 NumberFlipping an ImageSolution: Flipping an ImageSingle NumberSolution: Single NumberTwo Single NumbersSolution: Two Single NumbersReverse Bits

Challenge Yourself: IntroductionShortest BridgeNumber of Connected Components in an Undirected GraphPacific Atlantic Water FlowContains DuplicateMaximum SubarrayTwo SumFind Minimum in Rotated Sorted ArrayNon-overlapping IntervalsMeeting RoomsLargest Rectangle in HistogramSubtree of Another TreeSort ListNumber of 1 BitsContainer with the Most WaterEvaluate Reverse Polish Notation4SumLoud and RichProduct of Array Except SelfLongest Increasing SubsequenceSum of Two IntegersMajority ElementUnique PathsLongest Palindromic SubstringPermutations IINumber of ProvincesTop K Frequent WordsLinked List Cycle IIMinimum Flips to Make the Binary String AlternateLemonade ChangeHouse RobberFind All Numbers Disappeared in an ArrayFind All Duplicates in an ArraySame TreeDesign In-Memory File SystemDesign File SystemAsteroid CollisionRotting Oranges

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