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Storage Scalability

Design Cache Amazon Facebook Google Ola Cabs

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Highly Available Database Amazon Facebook

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Highly Consistent Database Facebook

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System Design Concepts

Design URL Shortener Amazon Directi Zenefits Facebook

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Design Messenger Amazon Amazon Lab126 Facebook Google Twitter

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Design Search Typeahead Facebook Google

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Time Complexity

Minimum Absolute Difference Facebook Paypal toppr progcap

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Arrays

Rotate Matrix Arrangement Google Facebook Amazon Zoho

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Max Sum Contiguous Subarray Array Math Facebook Paypal Yahoo Microsoft LinkedIn Amazon Goldman Sachs Deloitte DE Shaw

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Set Matrix Zeros Space recycle Oracle Amazon Facebook Paytm

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Math

Rearrange Array Number encoding Facebook

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Find Nth Fibonacci Number theory Facebook Deloitte

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Binary Search

Square Root of Integer Search answer Facebook Amazon Microsoft

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Rotated Array Sort modification Facebook

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Rotated Sorted Array Search Sort modification Facebook Google Microsoft Amazon

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Strings

Implement StrStr String Search Facebook Amazon Qualcomm Wipro Microsoft

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Integer To Roman String math Amazon Facebook Microsoft Twitter

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Roman To Integer String math Amazon Facebook Microsoft Twitter

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Pretty Json Pretty print Facebook Microsoft

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Count And Say string Simulation Facebook Amazon Microsoft

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Add Binary Strings String math Facebook Microsoft

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Reverse the String Words Qualcomm Amazon Microsoft Cisco Facebook Twitter

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Minimum Appends for Palindrome! string Tricks Facebook

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Two Pointers

Diffk Sorting Facebook

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Intersection Of Sorted Arrays Multiple arrays Facebook Google

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3 Sum Sorting Facebook Amazon Microsoft

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Sort by Color Inplace Update Facebook Microsoft

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Array 3 Pointers Tricks Google Microsoft Yahoo Facebook

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Container With Most Water Tricks Facebook Google Amazon Adobe

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Linked Lists

Add Two Numbers as Lists List math Amazon Qualcomm Microsoft Facebook

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Reverse Link List II list trick Facebook Microsoft Amazon

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Stacks And Queues

Evaluate Expression Stack math Yahoo Google Facebook

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Largest Rectangle in Histogram cleverstack Google Facebook Amazon OLX Group

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Backtracking

All Unique Permutations Microsoft Facebook Google

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Combination Sum Subsets Facebook Amazon Adobe

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Generate all Parentheses II Bruteforce builder Facebook Microsoft

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Letter Phone Bruteforce builder Facebook Epic systems

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Hashing

Substring Concatenation Incremental hash Facebook

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2 Sum Hash Search Facebook Amazon Google Microsoft

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Diffk II Hash Search Facebook

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Equal Key formation Facebook

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Tree Data Structure

Inorder Traversal of Cartesian Tree Tree construction Amazon Facebook

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Least Common Ancestor Tree search Facebook Adobe Microsoft Amazon Google

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Valid Binary Search Tree Simple tree ops Amazon Facebook

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Max Depth of Binary Tree Root to leaf Goldman Sachs Facebook Bloomberg Microsoft FactSet Oracle

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BST Iterator BST traversal Apple Amazon Facebook

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Min Depth of Binary Tree Root to leaf Facebook Amazon

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Dynamic Programming

Longest Increasing Subsequence Simple array DP Facebook Yahoo Epic systems Amazon Microsoft deshaw

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Unique Paths in a Grid Matrix DP Facebook

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Ways to Decode Simple array DP Facebook Amazon NoBroker.com OLX Group

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Best Time to Buy and Sell Stocks II Adhoc Amazon Facebook

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Best Time to Buy and Sell Stocks III DP tricky Amazon Facebook

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Best Time to Buy and Sell Stocks I Suffix / prefix DP Amazon Facebook

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Regular Expression Match 2D string DP Facebook Microsoft Goldman Sachs Directi Software ag Uber Technologies Inc

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Regular Expression II 2D string DP Facebook Microsoft Google

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Graph Data Structure & Algorithms

Level Order BFS Facebook Groupon Goldman Sachs

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Clone Graph graph hashing Google Facebook Amazon

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Largest Distance between nodes of a Tree Depth first search Facebook Google DP on a tree Depth first search

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