1. Array and string manipulation

Practice

Merging Meeting Times Reverse String in Place Reverse Words Merge Sorted Arrays Cafe Order Checker

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2. Hashing and Hash table

Practice

Inflight Entertainment Permutation Palindrome Word Cloud Data

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3. Greedy Algorithms

Practice

Apple Stocks Highest Product of 3 Product of All Other Numbers Cafe Order Checker In-Place Shuffle

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4. Sorting, searching and logarithms

Practice

Find Rotation Point Find Repeat, Space Edition Top Scores Merging Meeting Times

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5. Trees and Graphs

Practice

Balanced Binary Tree Binary Search Tree Checker 2nd Largest Item in a Binary Search Tree Graph Coloring MeshMessage Find Repeat, Space Edition BEAST MODE

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6. Dynamic programming and recursion

Practice

Recursive String Permutations Compute the nth Fibonacci Number Making Change The Cake Thief Balanced Binary Tree Binary Search Tree Checker 2nd Largest Item in a Binary Search Tree

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7. Queues and stacks

Practice

Largest Stack Implement A Queue With Two Stacks Parenthesis Matching Bracket Validator

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8. Linked lists

Practice

Delete Node Does This Linked List Have A Cycle? Reverse A Linked List Kth to Last Node in a Singly-Linked List Find Repeat, Space Edition BEAST MODE

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9. System design

Practice

URL Shortener MillionGazillion Find Duplicate Files

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10. Bit Manipulation

Practice

The Stolen Breakfast Drone

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11. Combinatorics, probability and other math

Practice

Which Appears Twice Find in Ordered Set In-Place Shuffle Simulate 5-sided die Simulate 7-sided die Two Egg Problem

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12. JavaScript

Practice

JavaScript Scope What's Wrong with This JavaScript?

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