LEETCODE 12 weeks study plan DSA

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Data Structure - LLDs - ( 1 Week )

List of data structures

• Lists

• Design Linked List

• Design Skiplist

• Stacks

• Implement Stack using Queues

• Design a Stack With Increment Operation

• LRU Cache

• Min Stack

• Max Stack

• Dinner Plate Stacks

• Implement Queue using Stacks

• Queue

• Design Circular Queue

• Hashtable

• Design HashMap

• Design HashSet

• BST 

• Binary Search Tree Iterator

• Serialize and Deserialize BST

• Red Black Tree

• Find Median from Data Stream

• Count of Range Sum

• Heaps 

• Design Twitter

• Kth Largest Element in a Stream

• Fibonacci Heaps

• Fibonacci Heaps

• Disjoint Sets

• Review of two popular approaches, Disjoint Sets and DFS

• Tries (PrefixTree, suffixTree)

• Implement Trie (Prefix Tree)

• Add and Search Word - Data structure design

• Interval Trees/Segment Tree

• Lazy Dynamic Segment Tree - A general template

• A Recursive approach to Segment Trees, Range Sum Queries & Lazy Propagation

• Other Tree Data Structures(Graphs)

• Serialize and Deserialize N-ary Tree

• Encode N-ary Tree to Binary Tree

Algorithms - Analysis Time and Space - ( 3 Weeks )

• Sorting  - 2 Days

• Selection Sort - Merge Sorted Array

• Bubble Sort - Sort Colors

• Insertion Sort - Insertion Sort List

• Merge Sort - Sort an Array

• Quick Sort 

• Kth Largest Element in an Array

• K Closest Points to Origin

• Counting Sort - Relative Sort Array

• Tree sort - Convert Sorted List to Binary Search Tree

• Bucket Sort - Top K Frequent Elements

• Radix Sort - Maximum Gap

• Topological sort - Covered in Graphs

• Divide-and-Conquer - 2 Days

• The maximum-subarray problem - Maximum Subarray

• Strassen’s algorithm for matrix multiplication - Divide and Conquer | Set 5 (Strassen's Matrix Multiplication)

• The substitution method for solving recurrences

• The recursion-tree method for solving recurrences

• The master method for solving recurrences

• Dynamic Programming - 2 Days

• Rod cutting - Integer Break

• Dynamic Programming for the confused : Rod cutting problem

• Matrix-chain multiplication - Burst Balloons

• Elements of dynamic programming

• Longest common subsequence - Longest Common Subsequence

• Optimal binary search trees

• Unique Binary Search Trees

• Unique Binary Search Trees II

• Greedy Algorithms - 2 Days

• An activity-selection problem - Minimum Number of Arrows to Burst Balloons

• Elements of the greedy strategy

• Huffman codes - Construct Huffman Tree, Google | Onsite | Software Engineer | Huffman Coding Algorithm, Minimum Cost Tree From Leaf Values

• Matroids and greedy methods - Matroid intersection in simple words

• A task-scheduling problem as a matroid - Task Scheduler

• Graph Algorithms - 6 Days

Leetcode Pattern 1 | DFS + BFS == 25% of the problems

• N-ary Tree Preorder Traversal

• N-ary Tree Postorder Traversal  

• N-ary Tree Level Order Traversal

• BFS

• Binary Tree Level Order Traversal

• Binary Tree Level Order Traversal II

• Web Crawler Multithreaded

• Web Crawler

• Cut Off Trees for Golf Event

• Course Schedule

• DFS

• Binary Tree Postorder Traversal

• Binary Tree Preorder Traversal

• Binary Tree Inorder Traversal

• Is Graph Bipartite?

• Remove Invalid Parentheses

• Construct Binary Tree from Preorder and Inorder Traversal

• Topological Sort - Topological Sort

• Strongly Connected Components - SCC - Course Schedule, Facebook | Minimum number of people to spread a message, Airbnb | Cover all vertices with the least number of vertices, Critical Connections in a Network

• Minimum spanning Tree - Prim's Algorithm

• Cheapest Flights Within K Stops

• Minimum Height Trees

• Number of Operations to Make Network Connected

• Connecting Cities With Minimum Cost

• Shortest Path Algos - 

• Bellman-Ford - Network Delay Time, https://leetcode.com/problems/get-watched-videos-by-your-friends/

• Dijkstra’s algorithm

• Reachable Nodes In Subdivided Graph

• Shortest Path Visiting All Nodes

• Floyd-Warshall

• Find the City With the Smallest Number of Neighbors at a Threshold Distance

• Evaluate Division

• Johnson’s algorithm

• All-pairs shortest paths - Johnson's algorithm for sparse graphs - GeeksforGeeks

• Johnson's algorithm

• The Ford-Fulkerson method

• Google | Onsite | Network flow for the matrix with given row and column sums

• Ford-Fulkerson Algorithm for Maximum Flow Problem

• Number-Theoretic Algorithms - 2 Days

• The Chinese remainder theorem - Check If It Is a Good Array

• Greatest common divisor

• Greatest Common Divisor of Strings

• X of a Kind in a Deck of Cards

• Google | OA Summer Intern 2020 | Greatest Common Divisor

• Powers of an element

• Pow(x, n)

• Sort Integers by The Power Value

• The RSA public-key cryptosystem

• Keys and Rooms

• Shortest Path to Get All Keys

• Integer factorization

• Largest Component Size by Common Factor

• Minimum Factorization

• 2 Keys Keyboard

• Bulb Switcher

• String Matching - 2 Day

• The Rabin-Karp algorithm

• Implement strStr()

• Binary String With Substrings Representing 1 To N

• Shortest Palindrome

• Find All Anagrams in a String

• String matching with finite automata

• The Knuth-Morris-Pratt algorithm

• Shortest Palindrome

• Rotate String

• KMP Algorithm for Pattern Searching

• Approximation Algorithms - 3 Days

• The vertex-cover problem

• Binary Tree Cameras

• Vertex Cover Problem-2

• Vertex Cover Problem

• The traveling-salesman problem Find the Shortest Superstring

• The set-covering problem

• Video Stitching

• Set Intersection Size At Least Two

• Non-overlapping Intervals

• Randomization and linear programming

• The subset-sum problem

• Partition Equal Subset Sum

• Partition to K Equal Sum Subsets

• Randomized Algorithms - 1 Day

• Quick Sort

• Min Cut Palindrome Partitioning II

Concepts Problems and Maths - ( 1 Week )

• Matrix Operations

• Linear Programming

• Polynomials - DFT, FFT

• Computational Geometry

• Line-segment properties

• Determining whether any pair of segments intersects

• Finding the convex hull - Erect the Fence, The Skyline Problem

• Finding the closest pair of points - K Closest Points to Origin

• GCD and LCM

• X of a Kind in a Deck of Cards

• Greatest Common Divisor of Strings

• Nth Magical Number

• Ugly Number III

• Prime Factorization and Divisors

• Largest Component Size by Common Factor

• 2 Keys Keyboard

• Fibonacci Numbers

• Length of Longest Fibonacci Subsequence

• Split Array into Fibonacci Sequence

• Find the Minimum Number of Fibonacci Numbers Whose Sum Is K

• Catalan Numbers - Unique Binary Search Trees

• Modular Arithmetic

• Euler Totient Function

• nCr Computations

• Set Theory

• Factorial

• Last Substring in Lexicographical Order

• Snakes and Ladders

• Factor Combinations

• Path With Maximum Minimum Value

• Number of Closed Islands

• Prime numbers and Primality Tests

• Prime Arrangements

• K-th Smallest Prime Fraction

• Sieve Algorithms

• Count Primes

• Divisibility and Large Numbers

• Series

• Number Digit

• Triangles

• Triangle

• Valid Triangle Number

Networks - ( 1 Week )

Leetcode

• Network Topology, OSI Architecture

• TCP/IP models

• TCP and UDP

• Firewall, DNS, Domains, workgroups

• Protocols i.e ICMP

OS - ( 1 week )

Operating System Tutorial
Shared Memory Systems

• Cache

• Multithreading

• Producers-consumers problem

• Dining philosophers problem

• Cigarette smokers problem

• Readers–writers problem

• Web Crawler Multithreaded

• Scheduling algorithms

• Deadlock

• Virtual Memory

• Mutex and semaphore

• Kernels

• Paging

Software Design Principles - ( 2 weeks )

System Design Primer

Start learning about Theory of Distributed Systems?

Challenges with distributed systems

Microservices Design Guide 👨‍🏫 - Platform Engineer

Cloud design patterns - Azure Architecture Center

Design patterns for microservices | Azure Blog and Updates

TO READ:

Domain Driven Design (DDD) | Bounded Context (BC) | Polyglot Persistence (PP)| Command and Query Responsibility Segregation (CQRS) | Command Query Separation (CQS) | Event-Sourcing (ES) | CAP Theorem | Eventual Consistency | Twelve-Factor App | SOLID Principles |

Just some things to focus on.

• Load balancer

• API gateway

• Microservices - Scale Cube Concept, MVC - READ

• Database Sharding

• SQL vs NoSQL - Cassandra, Postgres, Hadoop, Data lake, other algorithms related to data lake, CAP Theorem

Leadership Principles - LPs - ( 1 Week )

TO BE UPDATED

Leetcode solutions : watch here

Resume and Miscellaneous

#ADD WHATEVER YOU HAVE PUT IN RESUME

• Algos you have mentioned

• Project work and related references to read

• Achievements and information about it

REFERENCES

Introduction to Algorithms - Cormen

Leetcode

 

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