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3557 questions in one focused tracker. Company collections will use the same saved progress.

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Questions 3557

Done	Question	Resource
Mark Count Ways to Group Overlapping Ranges completed	Count Ways to Group Overlapping Ranges	Open
Mark Count Ways to Make Array With Product completed	Count Ways to Make Array With Product	Open
Mark Count Words Obtained After Adding a Letter completed	Count Words Obtained After Adding a Letter	Open
Mark Count Zero Request Servers completed	Count Zero Request Servers	Open
Mark Couples Holding Hands completed	Couples Holding Hands	Open
Mark Coupon Code Validator completed	Coupon Code Validator	Open
Mark Course Schedule completed	Course Schedule	Open
Mark Course Schedule II completed	Course Schedule II	Open
Mark Course Schedule III completed	Course Schedule III	Open
Mark Course Schedule IV completed	Course Schedule IV	Open
Mark Cousins in Binary Tree completed	Cousins in Binary Tree	Open
Mark Cousins in Binary Tree II completed	Cousins in Binary Tree II	Open
Mark Cracking the Safe completed	Cracking the Safe	Open
Mark Crawler Log Folder completed	Crawler Log Folder	Open
Mark Create a DataFrame from List completed	Create a DataFrame from List	Open
Mark Create a Session Bar Chart completed	Create a Session Bar Chart	Open
Mark Create Binary Tree From Descriptions completed	Create Binary Tree From Descriptions	Open
Mark Create Components With Same Value completed	Create Components With Same Value	Open
Mark Create Hello World Function completed	Create Hello World Function	Open
Mark Create Maximum Number completed	Create Maximum Number	Open
Mark Create Sorted Array through Instructions completed	Create Sorted Array through Instructions	Open
Mark Create Target Array in the Given Order completed	Create Target Array in the Given Order	Open
Mark Critical Connections in a Network completed	Critical Connections in a Network	Open
Mark Customer Order Frequency completed	Customer Order Frequency	Open
Mark Customer Placing the Largest Number of Orders completed	Customer Placing the Largest Number of Orders	Open
Mark Customers Who Bought All Products completed	Customers Who Bought All Products	Open
Mark Customers Who Bought Products A and B but Not C completed	Customers Who Bought Products A and B but Not C	Open
Mark Customers Who Never Order completed	Customers Who Never Order	Open
Mark Customers With Strictly Increasing Purchases completed	Customers With Strictly Increasing Purchases	Open
Mark Customer Who Visited but Did Not Make Any Transactions completed	Customer Who Visited but Did Not Make Any Transactions	Open
Mark Custom Sort String completed	Custom Sort String	Open
Mark Cut Off Trees for Golf Event completed	Cut Off Trees for Golf Event	Open
Mark Cutting Ribbons completed	Cutting Ribbons	Open
Mark Cycle Length Queries in a Tree completed	Cycle Length Queries in a Tree	Open
Mark Cyclically Rotating a Grid completed	Cyclically Rotating a Grid	Open
Mark Daily Leads and Partners completed	Daily Leads and Partners	Open
Mark Daily Temperatures completed	Daily Temperatures	Open
Mark Data Stream as Disjoint Intervals completed	Data Stream as Disjoint Intervals	Open
Mark Day of the Week completed	Day of the Week	Open
Mark Day of the Year completed	Day of the Year	Open
Mark Debounce completed	Debounce	Open
Mark Decoded String at Index completed	Decoded String at Index	Open
Mark Decode String completed	Decode String	Open
Mark Decode the Message completed	Decode the Message	Open
Mark Decode the Slanted Ciphertext completed	Decode the Slanted Ciphertext	Open
Mark Decode Ways completed	Decode Ways	Open
Mark Decode Ways II completed	Decode Ways II	Open
Mark Decode XORed Array completed	Decode XORed Array	Open
Mark Decode XORed Permutation completed	Decode XORed Permutation	Open
Mark Decompress Run-Length Encoded List completed	Decompress Run-Length Encoded List	Open
Mark Decrease Elements To Make Array Zigzag completed	Decrease Elements To Make Array Zigzag	Open
Mark Decrypt String from Alphabet to Integer Mapping completed	Decrypt String from Alphabet to Integer Mapping	Open
Mark Deepest Leaves Sum completed	Deepest Leaves Sum	Open
Mark Deep Merge of Two Objects completed	Deep Merge of Two Objects	Open
Mark Defanging an IP Address completed	Defanging an IP Address	Open
Mark Defuse the Bomb completed	Defuse the Bomb	Open
Mark Degree of an Array completed	Degree of an Array	Open
Mark Delayed Count of Equal Elements completed	Delayed Count of Equal Elements	Open
Mark Delete and Earn completed	Delete and Earn	Open
Mark Delete Characters to Make Fancy String completed	Delete Characters to Make Fancy String	Open
Mark Delete Columns to Make Sorted completed	Delete Columns to Make Sorted	Open
Mark Delete Columns to Make Sorted II completed	Delete Columns to Make Sorted II	Open
Mark Delete Columns to Make Sorted III completed	Delete Columns to Make Sorted III	Open
Mark Delete Duplicate Emails completed	Delete Duplicate Emails	Open
Mark Delete Duplicate Folders in System completed	Delete Duplicate Folders in System	Open
Mark Delete Greatest Value in Each Row completed	Delete Greatest Value in Each Row	Open
Mark Delete Leaves With a Given Value completed	Delete Leaves With a Given Value	Open
Mark Delete N Nodes After M Nodes of a Linked List completed	Delete N Nodes After M Nodes of a Linked List	Open
Mark Delete Node in a BST completed	Delete Node in a BST	Open
Mark Delete Node in a Linked List completed	Delete Node in a Linked List	Open
Mark Delete Nodes And Return Forest completed	Delete Nodes And Return Forest	Open
Mark Delete Nodes From Linked List Present in Array completed	Delete Nodes From Linked List Present in Array	Open
Mark Delete Operation for Two Strings completed	Delete Operation for Two Strings	Open
Mark Delete the Middle Node of a Linked List completed	Delete the Middle Node of a Linked List	Open
Mark Delete Tree Nodes completed	Delete Tree Nodes	Open
Mark Delivering Boxes from Storage to Ports completed	Delivering Boxes from Storage to Ports	Open
Mark Department Highest Salary completed	Department Highest Salary	Open
Mark Department Top Three Salaries completed	Department Top Three Salaries	Open
Mark Describe the Painting completed	Describe the Painting	Open
Mark Design a 3D Binary Matrix with Efficient Layer Tracking completed	Design a 3D Binary Matrix with Efficient Layer Tracking	Open
Mark Design a chat data model completed	Design a chat data model	Open
Mark Design a circular/ring buffer completed	Design a circular/ring buffer	Open
Mark Design a Concert Ticket Booking System completed	Design a Concert Ticket Booking System	Open
Mark Design a content delivery network (CDN) completed	Design a content delivery network (CDN)	Open
Mark Design Add and Search Words Data Structure completed	Design Add and Search Words Data Structure	Open
Mark Design a deck of cards / card game completed	Design a deck of cards / card game	Open
Mark Design a Digital Wallet Service completed	Design a Digital Wallet Service	Open
Mark Design a distributed cache completed	Design a distributed cache	Open
Mark Design a distributed cache (Azure Redis) completed	Design a distributed cache (Azure Redis)	Open
Mark Design a distributed cache (memcache at scale) completed	Design a distributed cache (memcache at scale)	Open
Mark Design a distributed key-value store (DynamoDB) completed	Design a distributed key-value store (DynamoDB)	Open
Mark Design a distributed lock / coordination (Chubby/Zookeeper) completed	Design a distributed lock / coordination (Chubby/Zookeeper)	Open
Mark Design a distributed message queue (Pub/Sub) completed	Design a distributed message queue (Pub/Sub)	Open
Mark Design a distributed unique ID generator completed	Design a distributed unique ID generator	Open
Mark Design a File Sharing System completed	Design a File Sharing System	Open
Mark Design a file system completed	Design a file system	Open
Mark Design a Food Rating System completed	Design a Food Rating System	Open
Mark Design a globally distributed database (Spanner) completed	Design a globally distributed database (Spanner)	Open
Mark Design Airline Management System completed	Design Airline Management System	Open
Mark Design a Job Scheduler completed	Design a Job Scheduler	Open