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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
8-Puzzle Solverhard-
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Two Sumeasy
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Add Two Numbers represented as Linked List in Reversed Ordermedium-
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Median of Two Sorted Arrayshard-
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Longest Palindromic Substringmedium
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Regular Expression Matchinghard-
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Valid Parentheseseasy
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Merge Two Sorted Linked Listseasy
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Merge K Sorted Listshard
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Optimal Array Rounding with Sum Preservationmedium-
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Find first and last positions of target element in sorted arraymedium-
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Combination Sum 1medium
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Trapping Rain Waterhard-
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Rotate Linked List to Rightmedium-
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Text Justificationhard-
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Minimum Window Substringhard
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Convert Sorted Array to height-balanced Binary Search Treeeasy
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Single Number 1 - All elements except one occur twiceeasy
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Intersection of Two Linked Listseasy-
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Fraction to Recurring Decimalmedium-
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Reverse Bitseasy
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House Robbermedium
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Happy Numbereasy-
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Course Schedule 2 - Get Ordered Coursesmedium-
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Design Add and Search Words Data Structuremedium
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Word Search 2 - Return All Wordshard
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Kth Largest Element in an Arraymedium-
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Contains Duplicate 1 - Check if array has duplicateseasy
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Contains Duplicate 2 - within k distanceeasy-
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Contains Duplicate 3 - within k distance and t differencehard-
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Maximal Squaremedium-
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Basic Calculator 2 Problemmedium-
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Lowest Common Ancestor of a Binary Treemedium
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Flatten 2D Vectormedium-
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Alien Dictionaryhard-
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Wiggle Sort 1medium-
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Bulls and Cowsmedium-
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Coin Change with Fewest Number of Coins Given Infinite Supplymedium
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Wiggle Sort 2 - No Adjacent Duplicatesmedium-
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Palindrome Pairshard-
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Flatten Nested List Iteratormedium-
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Mini Parsermedium-
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Find Largest Consecutive Integer Range in Arraymedium-
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Add Stringseasy-
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Design In-Memory File Systemhard-
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Design Circular Queuemedium-
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IP to CIDRmedium-
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Pour Watermedium-
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Pyramid Transition Matrixmedium-
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Employee Free Timehard-
airbnbamazonbloomberg
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