Data Structure & Algorithms | System Design | Online Course
Cracking the Coding & System Design Interviews
Road Map To A High Package Job
Course Content 125 lectures29:21:41

This course explains all the deep concepts of Data structure and Algorithms with the help of problems. These problems are frequently asked during interviews. System Design problems also explains with all core components of distributed system.

Segregation logic to Sort an array of 0's, 1's and 2's 

Given an array consisting only 0's, 1's and 2's. Write a program to sort  this array in O(n) time complexity with only one traversal ~~~~ Asked in : : Amazon, Microsoft, Adobe, WalmartLabs

Linear time approach to solve jump game problem

Given an array of integers where each element represents the max number of steps that can be made forward from that element. Write a program to find the minimum number of jumps to reach the end of the array (starting from the first element). If an element is 0, then cannot move through that element. ~~~~ Asked in: Adobe, Intuit

Digit rearrangement method to find next greater number with same set of digits

You have given a number. You have to find out next greater number to given number with the same set of digits ~~~~Asked in : Morgon Stanley, Makemystrip, Amazon

Rectangle Overlap problem

A rectangle is represented as a list [x1, y1, x2, y2], where (x1, y1) are the coordinates of its bottom-left corner, and (x2, y2) are the coordinates of its top-right corner. Like above two rectangle given with there respective coordinates. Find if these rectangle overlap or not. ~~~~Asked in: GoldmanSachs, Expedia, OLA

Greedy Techniques to find minimum number of platforms

You are given arrival and departure time of trains reaching to a particular station. Write a program to find minimum number of platforms required to accommodate the trains at any point of time ~~~~ Asked-in: DE-Shaw, Paytm, Cisco

Techniques to print matrix in spiral order without any extra space

you are given a matrix of m x n elements (m rows, n columns), Write a Program to print all elements of the matrix in spiral order ~~~~Asked in: Microsoft, OLA, PayTm, Oracle

Count frequencies of array elements in O(n) time complexity

Given an unsorted array of integers whose each element lies in range of 0 to n-1 where n is the size of the array, Calculate the frequency of all the elements present in the array in O(n) time and constant space ~~~~Askedin: PayTm, VmWare, Amazon

Linear time approach to solve Stock Buy Sell Problem

You are given an array represents cost of a stock on each day. You are allowed to buy and sell the stock only once.  Write an program to maximize the profit in single buy and sell ~~~~ Asked in: Amazon, Microsoft, Flipkart, DE-Shaw

In-place techniques matrix rotation method by 90 degree

You are given a square matrix, Write a Program to turn it by 90 degrees in anti-clockwise direction without using any extra space ~~~~ Asked in : Facebook, Google, Amazon, Microsoft

Array puzzle of solving celebrity problem

There are ( N+1 ) people in a party, they might or might not know each others names. ?There is one celebrity in the group (total N + 1 people), celebrity does not know any of N peoples by name and all N people know celebrity by name. You are given the list of people’s names (N + 1), You can ask only one question from the people. Do you know this name? How many maximum number of questions you need to ask to know the celebrity name? ~~~~Asked in: Google, Flipkart, Amazon, Microsoft

Implement the next permutation, which rearranges numbers into the numerically next greater permutation of numbers. If such arrangement is not possible, it must be rearranged as the lowest possible order ie, sorted in an ascending order. The replacement must be in-place, do not allocate extra memory ~~~~Asked in: Microsoft, Morgon Stanley, Samsung, Intuit

QuickSelect Algorithm to find the Kth smallest Element in array - 1

Given an array of integers which is non sorted, find kth smallest element in that array ~~~~ Vmware, SapLabs, WalmartLabs

Xor method to find the element that occurs one

Given an array where every element occurs three times, except one element which occurs only once. Find the element that occurs once. Expected time complexity is O(n) and O(1) extra space ~~~~Asked in : Flipkart, Amazon, PayTm

Binary search method to find square root of an element

Given an integer x, find square root of x without sqrt() function ~~~~Asked in : Accolite, Qualcomm

Rain Trapping Problem

you are given positive integers in the form of array which represent an elevation map where the width of each bar is 1, Write a Program to compute how much water it is able to trap after raining ~~~~ Asked in : Microsoft, DE-Shaw, Amazon, Adobe

Merge sort method to Count inversion in an array

Given an unsorted Array, Write a Program to find the count of Inversion required to make this array sorted. [The inversions of an array indicate; how many changes are required to convert the array into its sorted form ~~~~Asked in : Google, Microsoft

Binary search method to find Median of two sorted Array

There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)) ~~~~ Asked in: Intuit, Adobe

Design a data structure which performs the following operations(Insert an element/Remove an element /find random element) in O(1) time complexity ~~~~ Asked in : Google, Facebook, Amazon

Smallest window in a string containing all characters of another string - 1

Given two strings str and ptr, the task is to find the smallest substring in str containing all characters of ptr efficiently ~ Asked-in: WalmartLabs, Facebook

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Design Facebook NewsFeed

Design Facebook's Newsfeed, which would contain posts, photos, videos, and status updates from all the people ~~~~ Asked in: Amazon

Design Tiny URL

Design a URL shortening service like TinyURL. This service will provide short aliases for all long URLs ~~~~ Asked in : Flipkart, Facebook, Goldman Sach,

Design youtube/Netflix

Design a video sharing service like Youtube. User can upload,search and view the videos

Design BookMyShow

Design an online movie ticket booking system like : ~~~~Asked in : Amazon,Uber

Design Uber

Design a ride sharing system like Uber

System design component: Sharding techniques

Understanding the sharding techniques used in Distributed System. Sharding is technique to break up a big database (DB) into many smaller parts. For understanding scalable architecture, sharding is mandatory to understand

Backend System techniques for distributed system : SQl/NoSQL

Understanding of scalable architecture of DB. This section explains the relational databases and non-relational databases and CAP theoram used in distributed system

Design WhatsApp Chat Service

Design an instant messaging service like Whatsapp and Facebook Messenger where a user can send the instant message to other user through mobile ~~~Asked in : SapLabs, Facebook

Design Twitter like social networking service

Design a social networking service like twitter, where users can post tweet and follow others users ~~~~Asked in : Intuit, Linkedin, Amazon

Design the data structures for a generic deck of cards by using objected orinted princial ~~~~ Asked in : OLA, Juniper Networks

Design parking Lot

Design a parking lot System using object-oriented principles ~~~~Asked in : Cisco, Flipkart, Oracle

Design Online Hotel Booking System

Design online hotel booking system Like :, ~~~~ Asked in : Makemytrip,, Expedia

Design Instagram

Design a photo-sharing service like Instagram ~~Asked in : Google, Microsoft, Facebook

Design Drop Box/Google Drive

Design a file hosting service like Dropbox or Google Drive ~~~~ Asked in : NetApp, Cisco

Design Hit Counter

Design a hit counter which counts the number of hits received in the past 5 minutes. Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made to the system in chronological order (i.e. the timestamp is monotonically increasing). You may assume that the earliest timestamp starts at 1 ~~~~ Asked in : Microsoft, Amazon, OLA

Design custom implementation hashmap, how hashmap works internally in Java

Design Airline Reservation System

Design Object Oriented Design of Airline Reservation System(Like MakeMyTrip, . An Airline Management System is a managerial software which targets to control all operations of an airline. Airlines provide transport services for their passengers [Asked in : MakeMyTrip, Uber]

Design a two Player Online Chess Game

Design Object Oriented Design of Chess game which is played between two players [Asked in : Amazon, Microsoft, Intuit, oracle, Citrix ]

Design Online Shopping System Like Amazon, Flipkart

Object Oriented Design of Online Shopping System Like Amazon, Flipkart, ebay etc [Asked in: WalmartLabs, Intuit]

Design Cricinfo

Design a System like CricInfo which gives the details of a match along with all the players details and live ball by ball coverage of Match [ Asked in : Oracle,Qualcomm ] ]

Design Online food delivery system like Swiggy, Zomato

Design Online food delivery system like Swiggy, Zomato Apps. In this App user can search Restaurant, Select items in menu and Place Order. This System should also allow user to track its Order.

Design online Discussion forum (like stackoverflow,quora)

Design a discussion forum where members can comments, ask questions or provide answers to the question asked by other members

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Depth-first search method to find cycle in a graph

Consider a undirected graph without loops and multiple edges. We have to check whether it is acyclic, and if it is not, then find any cycle ~~~~Asked in : Adobe, MakemyTrip, Intuit

Topological sorting concepts and implementation

For a directed acyclic graph (DAG), a topological ordering is a linear ordering of its vertices such that for every directed edge from vertex  to vertex  (i.e., edge ),  u is listed before v. problem based on similar concept : There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a list of prerequisite pairs, is it possible for you to finish all courses? ~~~~Asked in : Accolite, Flipkart

Breadth first search algorithm to find Number of IsLand in matrix

Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water ~~~~Asked in : Citrix, Informatica, Expedia

Dijkstra Algorithm explanation with example

Dijkstra's algorithm allows us to find the shortest path between any two vertices of a graph ~~~~ Asked in : Google, Uber, Facebook

Topological Algorithm to solve alien dictionary problem

There is a new alien language which uses the latin alphabet. However, the order among letters are unknown to you. You receive a list of words from the dictionary, where words are sorted lexicographically by the rules of this new language. Derive the order of letters in this language ~~~~Asked in : Google, WalmartLabs, Adobe

Breadth first search algorithm to solve Rotten Orange Problem

Given a matrix of dimension m*n where each cell in the matrix can have values 0, 1 or 2 0: Empty cell 1: Cells have fresh oranges 2: Cells have rotten oranges we have to determine what is the minimum time required so that all the oranges become rotten ~~~~ Asked in : Microsoft, Amazon, Expedia

Trie data structure approach to solve word boggle Problem

Given a dictionary, a method to do lookup in dictionary and a M x N board where every cell has one character. Find all possible words that can be formed by a sequence of adjacent characters. Note that we can move to any of 8 adjacent characters, but a word should not have multiple instances of same cell

Breadth first search algorithm to solve snake ladder problem

Given a snake and ladder board, find the minimum number of dice throws required to reach the destination or last cell from source cell ~~~~ Asked in : Amazon, Flipkart

Understanding Queue based approach to Jumping Number problem

A number is called as a Jumping Number if all adjacent digits in it differ by 1. The difference between ‘9’ and ‘0’ is not considered as 1. Given a positive number x, print all Jumping Numbers smaller than or equal to x ~~~~Asked in : Morgan Stanley, OLA, NetApp

Trie data Structure implementation

Trie is the data structure very similar to Binary Tree. Trie data structure stores the data in particular fashion, so that retrieval of data became much faster and helps in performance

Trie data structure approach to solve type head suggestion problem

Design the autocomplete feature for example : Google search auto suggestion ~~~~ Asked in : Google, Apple

Package Dependency Problem Using Topological Sorting

There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a list of prerequisite pairs, is it possible for you to finish all courses? [Asked in : Adobe, WalmartLabs, Google]

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Longest Common Subsequences

Given two sequences, print all the possible longest common subsequence present in them. Let X be “XMJYAUZ” and Y be “MZJAWXU” then output is ~~~~ Asked in : Linkedin, PayPal

Edit Distance Problem

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitted on a word: 1. Insert a character 2. Delete a character 3. Replace a character ~~~~Asked in : Amazon, Microsoft, Myntra

Coin Change Problem

Given an unlimited supply of coins of given denominations, find the total number of distinct ways to get a desired change ~~~~ Asked in : Morgan Stanley, Microsoft, PayTm

Longest Palindrome Subsequences

The Longest Palindromic Subsequence (LPS) problem is the problem of finding the longest subsequences of a string that is also a palindrome ~~~~Asked in : Linkedin, Uber, Paypal

Word Break Problem

Given an input string and a dictionary of words, find out if the input string can be segmented into a space-separated sequence of dictionary words ~~~~Asked in : Google, WalmartLabs, IBM

Egg Dropping Problem

There are n number of eggs and building which has k floors. Write an algorithm to find the minimum number of drops is required to know the floor from which if egg is dropped, it will break ~~~~Asked in : Intuit, Amazon

KnapSack Problems

Given two integer arrays val[0..n-1] and wt[0..n-1] which represent values and weights associated with n items respectively. Also given an integer W which represents knapsack capacity, find out the maximum value subset of val[] such that sum of the weights of this subset is smaller than or equal to W ~~~~Asked in : Amazon, Google

Keystroke Problem

we have a specially made keyboard which has following four keys 1. This key prints character 'A' 2. (Ctrl-A) 3. (Ctrl-C) 4. (Ctrl-V) If you are allowed to press keys of this special keyboard N times, write a program which calculates maximum numbers of A's possible ~~~~Asked in : Google, Adobe, NetApp

String interleave Problem

Given three strings A, B and C. Write a function that checks whether C is an interleaving of A and B. C is said to be interleaving A and B, if it contains all characters of A and B and order of all characters in individual strings is preserved ~~~~Asked in : Yahoo, Yatra

Partition Problem

Partition problem is to determine whether a given set can be partitioned into two subsets such that the sum of elements in both subsets is same ~~~~Asked in : Amazon, Microsoft

Wild Card Problem

Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence). The matching should cover the entire input string. ~~~~Asked in : InMobi, OLA, Cisco

Matrix Path Problem

Given a cost matrix matrix[][] and a position (m, n) in matrix[][], write a function that returns cost of minimum cost path to reach (m, n) from (0, 0). Each cell of the matrix represents a cost to traverse through that cell ~~~~Asked in : Amazon, Facebook

Climbing Stairs Problem

You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top ~~~~Asked in : Morgan Stanley, Accolite, Samsung

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Sudoku Solving Problem - 1

Given a sudoko puzzle, solve this sudoko puzzle by using backtracking algorithm ~~~~Asked in : Microsoft, Amazon, Flipkart, Oracle

Print all Permutations of a given String

You are given a string and you are supposed to print all the distinct permutations of the string ~~~~Asked in : Apple, Cisco, Samsung

Rat Maze Problem

Given a maze, NxN matrix.matrix[0][0] (left top corner)is the source and matrix[N-1][N-1](right bottom corner) is destination. There are few cells which are blocked, means rat cannot enter into those cells. Rat can move in any direction ( left, right, up and down). A rat has to find a path from source to destination ~~~~Asked in : MakeMyTrip, Yatra, Expedia

Knight Walk Problem

Given a square chessboard of N x N size, the position of Knight and position of a target is given. We need to find out minimum steps a Knight will take to reach the target position~~~~Asked in : Amazon, WalmartLabs

Implement pow(x, n)

Given an integer x and a positive number n, write a efficient algorithm to computes x^n

N Queen Problem

find an arrangement of N queens on a chess board, such that no queen can attack any other queens on the board. The chess queens can attack in any direction as horizontal, vertical, horizontal and diagonal way [Asked in : VISA, Intuit]

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Connect Nodes at Same level in a Binary Tree

Given a binary tree, WAP to Connect all the nodes in same level of that binary tree

Convert a Binary Tree to Doubly Linked List

Given a binary tree , convert it to a doubly Linked List(DLL) in-place. The left and right pointers in nodes are to be used as previous and next pointers respectively in converted DLL.  The order of nodes in DLL must be same as inorder of the given Binary Tree. The first node of Inorder traversal (left most node in binary tree) must be head node of the DLL

Print nodes at k distance from root

Given a Binary Tree and a positive integer ‘k’, write code which will print all the nodes which are at distance ‘k’ from the root

Print all Nodes at Distance k from a given Node

We are given a binary tree (with root node root), a target node, and an integer value K. Return a list of the values of all nodes that have a distance K from the target node.  The answer can be returned in any order

Boundary Traversal of Binary Tree

Given a binary tree, print boundary nodes of the binary tree Anti-Clockwise starting from the root

Bottom View of Binary Tree

Given a binary tree, print the values of nodes which would be present in bottom of view of binary tree

Construct Tree from PostOrder

Given postorder traversal of a binary search tree, construct the binary search tree

Diameter of Binary tree

Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root

Left View of Binary Tree

Given a binary tree, print the values of nodes which would be present in left view of binary tree. A node will be in the left-view if it is the left-most node at its level

Reverse level order Traversal of Binary Tree

Given a binary tree, print its nodes level by level in reverse order. It means all the nodes at the last level should be printed first followed by the nodes of second last level and so on

Vertical sum of Binary Tree

Given a Binary Tree, find vertical sum of the nodes that are in same vertical line. Print all sums through different vertical lines

Spiral Order of Binary Tree

Given a binary tree, print its nodes level by level in spiral order. i.e. all nodes present at level 1 should be printed first from left to right, followed by nodes of level 2 right to left, followed by nodes of level 3 from left to right and so on

Serialize and Deserialize a Binary Tree

Write an algorithm to serialize and deserialize a binary tree. Writing the tree to a file is called 'serialization' and reading back from the file to reconstruct the exact same binary tree is 'deserialization'

Given two n-ary trees, the task is to check if they are mirror of each other or not

Maximum Path Sum in a Binary Tree

Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree ~ Flipkart, VMware

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Group Anagrams Together

Given an array of strings, return all groups of strings that are anagrams ~~~~Asked in : Snapdeal, MakeMyTrip

Find first non-repeating character from a stream of characters

Given a stream of characters, find the first non-repeating character from stream. You need to tell the first non-repeating character in O(1) time at any moment

Design and implement LRU

Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get(key)and set(key,value)

Four Sum Problem

Given an array  of n integers and an integer target, Find if there elements a, b, c, and d in integers present in array  such that a + b + c + d = target. Find all unique quadruplets in the array which gives the sum of target

Convert Number to Words Problems

Write an efficient algorithm to convert a given number into words. For ex: 1234 as ~~~~Asked in: Oracle,Amazon,Microsoft

Median of running data streams problem

Given that integers are being read from a data stream. Find median of all the elements read so far starting from the first integer till the last integer. The data stream can be any source of data, example: a file, an array of integers etc

Merge k Sorted arrays

Given k sorted array, write an efficient algorithm to merge them into one sorted array

Minimum Window Substring

Given two strings string1 and string2, the task is to find the smallest substring in string1 containing all characters of string2 [Asked in : Facebook, J P morgan]

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Histogram Problem

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the this histogram

Stack that Supports getMin() in O(1)

Design a data structure which support push()/pop()/findminimum() operation in O(1) time

Find Maximum size rectangle in Binary Sub-matrix

Given a binary matrix, find the maximum size rectangle binary-sub-matrix with all 1’s

Sliding Window Problem using deque Data Structure

Given an array and an integer K, find the maximum for each and every contiguous subarray of size k ~ Asked-in: Google,Facebook,DE-Shaw

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Flattering of LinkedList

Given a linked list, in addition to the next reference, each node has a child pointer that can point to a separate list. With the head node, flatten the list to a single-level linked list

Merge two Sorted Linked List

Given two linked list sorted in increasing order. Given two linked list sorted in increasing order. We have to merge sorted linked lists and return a new single linked list which contains nodes of both linked list in increasing order

Sort Linked List using Merge Sort

Given a linked list, sort it using merge sort algorithm

Clone a Linked List

You are given a double Link List with one reference of each node pointing to the next node just like in a single link list. The second reference however can point to any node in the list and not just the previous node.Write a program in O(n) time which will create a copy of this list

Reverse K Linked List

Given a linked list, WAP to reverse the nodes of a linked list k at a time and return its modified list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is. You may not alter the values in the nodes, only nodes itself may be changed

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How to choose best architecture for System Design interview problems

Most preferred design which is highly maintainable and testable. Loosely coupled. Independently deployable

Understanding Asynchronous flow between Modules to boost the distributed system performance

Using standards-based, asynchronous communication, ActiveMQ allows loose coupling of the elements in distributed environment

How to Handle Cascading failure in System Design Problems

Fault tolerance is the property that enables a system to continue operating properly in the event of the failure of some of its components. This video we will explain how to achieve fault tolerance.

Handling and Managing the cluster of machine in Distributed Environment.

One of the Key feature service mesh is used to differentiate the Infrastructure of the system from development. Service Discovery, Load Balancer, Distributed Tracing and Monitoring are the Infrastructure component that is present in Micro service Architecture

Understanding the Distributed Messaging System Kafka

Kafka give higher throughput, reliability, and replication has made this technology replace conventional message brokers. Kafka can work with HBase, Flink, Flafka, and Spark for analysis and processing real-time data, which makes Kafka scalable as it allows us to build distributed applications ~~~ Askedin : Uber, Google,Informatica

Concurrency and System failure issues in DB transaction in System Design

When we design backend system of DB of any System Design problem, we should take care concurrency and System failure issues during transaction. This video will explain how tackle these transaction issue in backend system .

Distributed Transaction of backend in Distributed System

This tutorial will take transaction concept to next level. If we have scalable distributed system how we design transaction system .

Complete steps of Building and Deploying App in Docker Container Cloud Platform

Now a days all The Distributed Microservices are Deployed in Docker Container Cloud Platform. Understanding Cloud Infrastructure is very important for interview. As every industry are already moved to cloud. This Tutorial we will explain all steps involved start from development to deployment Application in Cloud platform

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Multithreading concepts with Examples and Code

Multiple Threads access the critical section in race condition, So protect that we used Synchronization instance or block to protect it

How to Achieve the synchronization between Multithreaded Environment

Most of the projects used multithreading system, Multiple ways are there to create and instantiate threads along with that maintain the lifecycle of threads.

How to Create Deadlock and Remove it in Multithreaded Environment

Implementation of communication between the threads using wait & Notify methods. Also, Create deadlock and then Remove it.

Print sequence of Natural numbers using Three Threads

You are given 3 threads. You need to print sequence of natural number using these 3 threads

Implementation of Multi Reader and Writer Problem using Multithreading

Readers-Writers Problem consists of multiple threads that are reading from and writing to a shared resource Queue

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Data Structure, Algorithms, System Design, OOPS Design, Scalable System Design Concepts, Distributed System, Multithreading & Many More....

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✔ Should have basic knowledge of C/C++/Java/C#/Python Programming
✔ All Concepts Explains From Very Basic to Advanced Level

Who Should Subscribe For this Course

  • Working professionals preparing for interviews of Big-5(Google,Amazon,Microsoft,Facebook,Apple) and Top Product Based organization
  • B.Tech/MCA/MS Students looking for data structures,Algorithms & System Design coaching
  • Job seekers who are preparing for interview in Product MNC/ecommerce companies
  • Anyone who has deep desire to learn data structures,algorithms and system design to improve programming/coding skills and designing skills

Course Duration : 29+ Hours

Course Content:

Each topic explains from very basic to advanced level by using multiple examples. More focus is on implementation than theory. Every Concepts and Problems explained with complete code. It's like a quick Interview Prepration Guide

Topics Covered in this Course

  • Arrays and Recursion
  • Graph
  • System Design
  • Object Oriented Design
  • Dynamic Programming
  • Hashing & Heap Operations
  • Backtracking Algorithms & Greedy Algorithms
  • Scalable System Design Components
  • Microservice Architecture Concepts
  • Binary Tree
  • Stack & Queue
  • Distributed System
  • LinkedList
  • Deployment in Cloud using Docker
  • Multithreading & Synchronization
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