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215 problems
215 unsolved0 revision26 topics • 95 patterns • 215 problems
First Missing Positive
ArrayHash TableAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Contains Duplicate
ArrayHash TableAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Construct Binary Tree from Inorder and Postorder Traversal
ArrayHash TableDivide and ConquerAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Set Matrix Zeroes
ArrayHash TableMatrixAmazonMicrosoftMeta
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Construct Binary Tree from Preorder and Inorder Traversal
ArrayHash TableDivide and ConquerAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Move Zeroes
ArrayTwo PointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Duplicates from Sorted Array
ArrayTwo PointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Sort Colors
ArrayTwo PointersSortingAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Next Permutation
ArrayTwo PointersAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Sliding Window Maximum
ArraySliding WindowHeapAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Max Consecutive Ones III
ArraySliding WindowTwo PointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Pascal's Triangle
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Maximal Square
ArrayDynamic ProgrammingMatrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Best Time to Buy and Sell Stock IV
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Best Time to Buy and Sell Stock III
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Unique Paths II
ArrayDynamic ProgrammingMatrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Path Sum
ArrayDynamic ProgrammingMatrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Triangle
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Coin Change
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
House Robber
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Maximum Sum Circular Subarray
ArrayDynamic ProgrammingGreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Cheapest Flights Within K Stops
ArrayDynamic ProgrammingGraphAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Partition Equal Subset Sum
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Maximum Product Subarray
ArrayDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Unique Paths
ArrayDynamic ProgrammingMathAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Longest Increasing Subsequence
ArrayBinary SearchDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Median of Two Sorted Arrays
ArrayBinary SearchDivide and ConquerAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find Minimum in Rotated Sorted Array
ArrayBinary SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find First and Last Position of Element in Sorted Array
ArrayBinary SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Search in Rotated Sorted Array
ArrayBinary SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find Peak Element
ArrayBinary SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Search a 2D Matrix
ArrayBinary SearchMatrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Search Insert Position
ArrayBinary SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Swim in Rising Water
ArrayBinary SearchDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Search a 2D Matrix II
ArrayBinary SearchMatrixAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Single Number II
ArrayBit ManipulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Single Number
ArrayBit ManipulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find K Pairs with Smallest Sums
ArrayHeapPriority QueueAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
IPO
ArrayGreedySortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Min Cost to Connect All Points
ArrayGreedyGraphAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Kth Largest Element in an Array
ArraySortingHeapAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Construct Quad Tree
ArrayMatrixDivide and ConquerAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Game of Life
ArrayMatrixSimulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Spiral Matrix
ArrayMatrixSimulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Convert Sorted Array to Binary Search Tree
ArrayBinary Search TreeTreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Word Search
ArrayBacktrackingDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
N Queens II
ArrayBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Combination Sum
ArrayBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Permutations
ArrayBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Subsets
ArrayBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
N Queens
ArrayBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyHard
Importance
Practice
LCEA
Solution
Revision
Note
Rotate Image
ArrayMathMatrixAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Maximum Subarray
ArrayDivide and ConquerDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Max Consecutive Ones
ArrayAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Array
Arraygoogleapple
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Rotate Array
Array
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Pacific Atlantic Water Flow
ArrayDepth-First SearchBreadth-First SearchGoldman SachsAdobeAtlassian
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Course Schedule II
ArrayDepth-First SearchBreadth-First SearchArrayDepth-First SearchBreadth-First Search
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Course Schedule
ArrayDepth-First SearchBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Surrounded Regions
ArrayDepth-First SearchBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Number of Islands
ArrayDepth-First SearchBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Snakes and Ladders
ArrayBreadth-First SearchMatrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Rotting Oranges
ArrayBreadth-First SearchMatrixAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Evaluate Division
ArrayStringDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Evaluate Division
ArrayStringDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Redundant Connection
ArrayGraphUnion FindAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find All Anagrams in a String
StringHash TableSliding WindowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Genetic Mutation
StringHash TableBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Edit Distance
StringDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Interleaving String
StringDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Palindromic Substring
StringDynamic ProgrammingTwo PointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Common Subsequence
StringDynamic ProgrammingAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Longest Valid Parentheses
StringDynamic ProgrammingStackAmazonGoogleMicrosoft
DifficultyHard
Importance
Practice
LCEA
Solution
Revision
Note
Add Binary
StringMathBit ManipulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Letter Combinations of a Phone Number
StringBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Palindrome Partitioning
StringBacktrackingRecursionAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Simplify Path
StringStackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Decode String
StringStackRecursionAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Find the Index of the First Occurrence in a String
StringString MatchingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Words in a String
StringTwo PointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Serialize and Deserialize Binary Tree
StringTreeDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Palindrome Linked List
Linked ListTwo PointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Partition List
Linked ListTwo PointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Duplicates from Sorted List II
Linked ListTwo PointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Linked List Cycle II
Linked ListTwo PointersAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Linked List Cycle II
Linked ListTwo PointersAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Sort List
Linked ListSortingDivide and ConquerLinked ListSortingDivide and Conquer
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Flatten Binary Tree to Linked List
Linked ListStackTreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Linked List II
Linked ListAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Populating Next Right Pointers in Each Node II
Linked ListTreeDepth-First SearchAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Populating Next Right Pointers in Each Node
Linked ListTreeBinary TreeLinked ListTreeBinary Tree
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Swap Nodes in Pairs
Linked ListRecursionTwo PointersAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Swap Nodes in Pairs
Linked ListRecursionAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Word Break
Dynamic ProgrammingHash TableStringAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Maximum Path Sum
Dynamic ProgrammingTreeDepth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Climbing Stairs
AmazonGoogleMicrosoftAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Bitwise AND of Numbers Range
Bit ManipulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Number of 1 Bits
Bit ManipulationAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Bits
Bit ManipulationDivide and ConquerAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find Median from Data Stream
Two HeapsHeapPriority QueueAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Combinations
BacktrackingArrayRecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Word Search II
TrieArrayStringAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Design Add and Search Words Data Structure
TrieHash TableStringAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Implement Trie (Prefix Tree)
TrieHash TableStringAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Average of Levels in Binary Tree
TreeBreadth-First SearchBinary TreeAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Right Side View
TreeDepth-First SearchBreadth-First SearchAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Right Side View
TreeDepth-First SearchBreadth-First SearchAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Sum Root to Leaf Numbers
TreeDepth-First SearchBinary TreeTreeDepth-First SearchBinary Tree
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Path Sum
TreeDepth-First SearchBreadth-First SearchAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Validate Binary Search Tree
TreeDepth-First SearchBinary Search TreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Absolute Difference in BST
TreeDepth-First SearchBreadth-First SearchAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Lowest Common Ancestor of a Binary Search Tree
TreeDepth-First SearchBinary Search TreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Lowest Common Ancestor of a Binary Tree
TreeDepth-First SearchBinary TreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Kth Smallest Element in a BST
TreeDepth-First SearchBinary Search TreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Path Sum III
TreeDepth-First SearchBinary TreeAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Binary Search Tree Iterator
TreeStackDesignAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Search Tree Iterator
TreeStackDesignAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
LRU Cache
Hash TableLinked ListDesignAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Word Ladder
Hash TableStringBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Clone Graph
Hash TableDepth-First SearchBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Basic Calculator
MathStringStackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Network Delay Time
GraphShortest PathHeapAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Graph Valid Tree
GraphDepth-First SearchBreadth-First SearchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reconstruct Itinerary
Depth-First SearchGraphEulerian PathAirbnbUberExpedia
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Build an adjacency list and start DFS/BFS from node 0.
Depth-First SearchBreadth-First SearchUnion FindAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Count Complete Tree Nodes
Binary SearchBit ManipulationTreeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Process one complete level at a time.
treedepth-first-searchbreadth-first-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Symmetric Tree
treedepth-first-searchbreadth-first-searchAmazonLinkedInGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Same Tree
treedepth-first-searchbreadth-first-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Maximum Depth of Binary Tree
treedepth-first-searchbreadth-first-searchAmazonGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Invert Binary Tree
treedepth-first-searchbreadth-first-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Zigzag Level Order Traversal
treebreadth-first-searchbinary-treeAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Level Order Traversal
treebreadth-first-searchbinary-treeAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Rotate List
linked-listtwo-pointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Nth Node From End of List
linked-listtwo-pointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Nodes In K Group
linked-listrecursionAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Merge Two Sorted Lists
linked-listrecursionAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Add Two Numbers
linked-listmathrecursionAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Merge k Sorted Lists
linked-listdivide-and-conquerheapAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Find the Duplicate Number
arraytwo-pointersbinary-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
3Sum Closest
arraytwo-pointerssortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
3Sum
arraytwo-pointerssortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Container With Most Water
arraytwo-pointersgreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Two Sum II Input Array Is Sorted
arraytwo-pointersbinary-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Largest Rectangle in Histogram
arraystackmonotonic-stackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Daily Temperatures
arraystackmonotonic-stackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Car Fleet
arraysortingstackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Non Overlapping Intervals
arraysortinggreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Merge Intervals
arraysortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Number of Arrows to Burst Balloons
arraygreedysortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Evaluate Reverse Polish Notation
arraymathstackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Insert Interval
arrayintervalsAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Summary Ranges
arrayAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Consecutive Sequence
arrayhash-tableunion-findAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Contains Duplicate II
arrayhash-tablesliding-windowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Valid Sudoku
arrayhash-tablematrixAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Insert Delete GetRandom
arrayhash-tabledesignAmazonGoogleMeta
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Group Anagrams
arraystringhash-tableAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Size Subarray Sum
arraysliding-windowtwo-pointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Copy List with Random Pointer
hash-tablelinked-listAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Linked List Cycle
hash-tablelinked-listtwo-pointersAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Binary Tree Inorder Traversal
stacktreedepth-first-searchAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Min Stack
stackdesignAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Generate Parentheses
stringbacktrackingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Valid Parentheses
stringstackAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Word Pattern
stringhash-tableAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Isomorphic Strings
stringhash-tableAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Ransom Note
stringhash-tablecountingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Valid Anagram
stringhash-tablesortingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Window Substring
stringhash-tablesliding-windowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Substring with Concatenation of All Words
stringhash-tablesliding-windowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Substring Without Repeating Characters
stringhash-tablesliding-windowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Roman to Integer
stringhash-tablemathAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Is Subsequence
stringtwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Valid Palindrome
stringtwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Text Justification
stringsimulationgreedyGoogleAmazonMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Zigzag Conversion
stringsimulationAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Valid Number
stringGoogleMicrosoftAmazon
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Common Prefix
stringAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Length of Last Word
stringAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
String to Integer (atoi)
stringmathAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Integer to Roman
stringmathgreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Trapping Rain Water
arraystwo-pointersdynamic-programmingAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Duplicates from Sorted Array II
arraystwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Merge Sorted Array
arraystwo-pointerssortingAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Elements from Sorted Array
arraystwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Remove Elements
arraystwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Candy
arraysgreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Gas Station
arraysgreedyAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Jump Game II
arraysgreedydynamic-programmingAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Jump Game
arraysgreedydynamic-programmingAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Best Time to Buy and Sell Stock II
arraysgreedydynamic-programmingAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Majority Element
arraysgreedyAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Product of Array Except Self
arraysprefix-sumAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Running Sum of an Array
arraysprefix sumamazongooglemicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
H Index
arrayssortingGoogleMicrosoftAmazon
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Best Time to Buy and Sell Stock
arraysdynamic-programmingAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Minimum Size Subarray Sum
arrayssliding-windowAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Two Sum
arrayshash-mapAmazonGoogleMicrosoft
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Rotate Array
arraysmathtwo-pointersAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Longest Subarray with Sum K
arraysmaphashmapamazon
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Happy Number
mathhash-setAmazonMicrosoftGoogle
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Print All Divisors
mathTCSAccenture
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Check if a Number is Armstrong
mathTCSAccenture
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
GCD of Two Numbers
mathAccentureTCS
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Palindrome Number
math
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Reverse Integer
math
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Count Digits in a Number
math
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Count the Digits That Divide a Number
math
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Bubble Sort
sortingarraysTCSAccentureInfosys
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Selection Sort
sortingarraysTCSAccentureInfosys
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Insertion Sort
sortingarraysTCSAccentureInfosys
DifficultyEasy
Importance
Practice
LCEA
Solution
Revision
Note
Top K Frequent Elements
HashingHeapAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Subarray Sum Equals K
HashingArrayPrefix SumHashingArrayPrefix Sum
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note
Partition Labels
GreedyStringAmazonGoogleMicrosoft
DifficultyMedium
Importance
Practice
LCEA
Solution
Revision
Note