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316 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
Apply Substitutionsmedium-
Find if there is a path between two vertices in a directed grapheasy-
googlefacebookamazon
Implement Hierarchical Locking System for Tree Structuresmedium-
Longest Special Pathhard-
Longest Special Path IIhard-
Maximize Amount After Two Days of Conversionsmedium-
Maximum Sum of Edge Values in a Graphhard-
Minimize the Maximum Edge Weight of Graphmedium-
Minimum Runes to Add to Cast Spellhard-
Minimum Time to Break Locks IIhard-
Path With Minimum Effortmedium-
Properties Graphmedium-
Shortest Path in a Weighted Treehard-
Smallest String With Swapsmedium-
Subtree Inversion Sumhard-
Unit Conversion Imedium-
Unit Conversion IImedium-
Word Search 1 - Find if word existsmedium
adobeamazonapple
Binary Tree Inorder Traversaleasy-
alibabaamazonapple
Validate Binary Search Treemedium
adobeamazonapple
Recover Binary Search Treemedium-
amazonbloombergfacebook
Same Treeeasy
amazonapplebloomberg
Symmetric Binary Treeeasy-
adobealibabaamazon
Maximum Depth of Binary Treeeasy
adobeamazonapple
Balanced Binary Treeeasy-
adobeamazonapple
Minimum Depth of Binary Treeeasy-
amazonapplefacebook
Path Sum 1 - Check if root to leaf path existseasy-
adobeamazonapple
Path Sum 2 - find all root to leaf pathsmedium-
adobeamazonapple
Flatten binary tree to linked list in order of preorder traversalmedium-
adobeamazonapple
Populate next pointer to right node in Perfect Binary Treemedium-
amazonapplebloomberg
Populate next pointer to right node in Binary Treemedium-
amazonbloombergfacebook
Binary Tree Path Sum - Maximum between any two nodeshard
adobeamazonappdynamics
Sum Root to Leaf Numbersmedium-
amazonbloombergebay
Surrounded Regionsmedium-
amazonebayfacebook
Clone Undirected Graphmedium
amazonapplefacebook
Binary Tree Preorder Traversaleasy-
amazonbloombergcisco
Binary Tree Postorder Traversaleasy-
adobeamazonfacebook
Binary Tree Upside Downmedium-
googlelinkedin
Binary Tree Right Side Viewmedium-
adobeamazonapple
Number of Islandsmedium
adobeaffirmalibaba
Course Schedule 1 - Is it Possiblemedium
amazonapplebloomberg
Course Schedule 2 - Get Ordered Coursesmedium-
airbnbamazonapple
Design Add and Search Words Data Structuremedium
airbnbamazonapple
Invert Binary Treeeasy
amazonapplebloomberg
Kth Smallest Element in a BSTmedium
affirmamazonapple
Lowest Common Ancestor of a Binary Search Treemedium
adobeamazonbloomberg
Lowest Common Ancestor of a Binary Treemedium
adobeairbnbamazon
Count Univalue Subtreesmedium-
amazonbloombergbox
Binary Tree Path - All root to leaf pathseasy-
adobeamazonapple
Graph Valid Treemedium-
amazonfacebookgoogle
Showing 1 to 50 of 316 results
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