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4301 problems total

Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)
All Topics(4301)Algorithms(3944)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)

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TitleDifficultyVideosCompanies
Binary Watcheasy-
applegoogle
Remove K Digitsmedium-
adobeamazonbloomberg
Frog Jumphard-
amazonapplebytedance
Sum of Left Leaveseasy
adobeamazonbloomberg
Convert Number to Hexadecimal Number Problemeasy-
facebookmicrosoft
Queue Reconstruction by Heightmedium-
amazonapplebloomberg
Trapping Rain Water 2hard-
amazonapplebytedance
Valid Word Abbreviationeasy-
facebookgoogle
Longest Palindromeeasy
amazongoogleintuit
Split Array Largest Sumhard-
amazonbaidufacebook
Minimum Unique Word Abbreviationhard-
google
Fizz Buzzeasy-
adobeamazonapple
Arithmetic Slicesmedium-
aetionamazonbaidu
Third Maximum Numbereasy-
amazonbloombergfacebook
Add Stringseasy-
adobeairbnbamazon
Partition Equal Subset Summedium-
amazonappleebay
Pacific Atlantic Water Flowmedium-
amazonapplebloomberg
Sentence Screen Fittingmedium-
googlerobinhood
Battleships in a Boardmedium-
amazonapplefacebook
Strong Password Checkerhard-
adobeamazongoogle
Maximum XOR of Two Numbers in an Arraymedium-
amazongoogle
Valid Word Squareeasy-
bloomberggoogle
Reconstruct Original Digits from Englishmedium-
Longest Substring with Same Letters after Replacementmedium
bloomberggooglepocket-gems
Word Squareshard-
googleoracle
Convert Binary Search Tree to Sorted Doubly Linked Listmedium-
amazonbloombergdatabricks
Construct Quad Treemedium-
amazonapplegoogle
Serialize and Deserialize N-Ary Treehard-
amazonappleebay
N-ary Tree Level Order Traversalmedium-
amazon
Flatten a Multilevel Doubly Linked Listmedium-
amazonapplebloomberg
Encode N-ary Tree to Binary Treehard-
microsoft
All O`one Data Structurehard
amazonbloombergfacebook
Minimum Genetic Mutationmedium-
amazongoogletwitter
Number of Segments in a Stringeasy-
Non-overlapping Intervalsmedium
amazonapplebloomberg
Find Right Intervalmedium-
Path Sum 3 - Count paths from parent to childmedium-
amazonbloombergfacebook
Find anagrams of a string in another stringmedium-
amazonbloombergfacebook
Ternary Expression Parsermedium-
snapchat
K-th Smallest in Lexicographical Orderhard-
bytedancegooglehulu
Arranging Coinseasy-
amazongodaddy
Find All Duplicates in an Arraymedium-
amazonapplebloomberg
String Compressionmedium-
akuna-capitalamazonapple
Sequence Reconstructionmedium-
google
Add Two Numbers represented as Linked List in Forward ordermedium-
amazonapplebloomberg
Arithmetic Slices II - Subsequencehard-
adobealibababaidu
Number of Boomerangsmedium-
amazongoogle
Find All Numbers Disappeared in an Arrayeasy-
adobeapplebloomberg
Serialize and Deserialize Binary Search Tree BSTmedium-
amazonbytedanceebay
Delete in a Binary Search Treemedium-
amazonapplebloomberg
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