All Problems

44 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
Longest Common Prefix in array of stringeasy-
adobealibabaamazon
Reconstruct Jumbled Sequencemedium-
pinterest
Valid Sudokumedium-
adobeamazonapple
Jump Game 1 - Check if it reaches last indexmedium
adobeamazonapple
Merge Overlapping Intervalsmedium
adobealibabaamazon
Text Justificationhard-
airbnbamazonapple
Word Search 1 - Find if word existsmedium
adobeamazonapple
Decode Waysmedium
adobeamazonapple
Word Ladder 2 - Get all the laddershard-
amazonapplebloomberg
Word Ladder 1 - Get Ladder Lengthhard-
affirmamazonapple
Word Break 1 - Check if word is breakablemedium
adobeamazonapple
Word Break 2 - Construct a sentencehard
amazonappleaudible
Design LRU Cachemedium-
adobealibabaamazon
Read N Characters Given Read4 2 - Call Multiple Timeshard-
amazonbloombergfacebook
Happy Numbereasy-
adobeairbnbamazon
Implement Triemedium
amazonapplebloomberg
Course Schedule 2 - Get Ordered Coursesmedium-
airbnbamazonapple
Basic Calculator 1hard-
adobeamazonbloomberg
Lowest Common Ancestor of a Binary Treemedium
adobeairbnbamazon
Sliding Window Maximumhard-
adobealibabaamazon
Factor Combinationsmedium-
googlelinkedinpinterest
Graph Valid Treemedium-
amazonfacebookgoogle
Alien Dictionaryhard-
airbnbamazonapple
Find the Celebritymedium-
amazonapplefacebook
Find Median from Data Streamhard
adobeamazonapple
Flatten Nested List Iteratormedium-
airbnbamazonapple
Design Hit Countermedium-
affirmamazonapple
Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowedmedium-
adobeaffirmamazon
Is Subsequenceeasy
amazonbloombergcoursera
Serialize and Deserialize N-Ary Treehard-
amazonappleebay
Find the Closest Palindromehard-
amazonfacebookgoogle
Find Median Given Frequency of Numbershard-
pinterest
Task Schedulermedium-
amazonapplebloomberg
Smallest Range Covering Elements from K Listshard-
amazonapplefacebook
Partition to K Equal Sum Subsetsmedium-
amazonbytedanceebay
Maximum Length of Repeated Subarraymedium-
citadelindeedintuit
Longest Word in Dictionarymedium-
amazongoldman-sachsgoogle
Number of Atomshard-
adobeamazonbytedance
Employee Free Timehard-
airbnbamazonbloomberg
Basic Calculator 4hard-
amazongoogleindeed
Basic Calculator 3hard-
amazonapplebytedance
Subdomain Visit Countmedium-
amazonapplecitrix
Knight Dialermedium-
boxcitadelfacebook
Interval List Intersectionsmedium-
amazonapplebloomberg