# 100-DAYS-OF-DSA-CODE-CHALLENGE-2.0

I Again accepted the #100 Days of Code Challenge to improve and learn something new every day for at least an hour. That way, I can enhance my coding skills.

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📌 You Can Check My Previous Challenge Journey On This Repo #100 DAYS OF CODE CHALLENGE

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• I Will Follow Two Basic Rules:

  1. Code for at least one hour per day for the following 100 days.

  2. Every day I'm going to update on LinkedIn with my progress using the hashtag #100DaysOfCode.

• My Exceptions Are:

  1. If I break the streak, I will make sure that I won't break it the next day.

  2. My college exam(10-15 Days), as well as a few emergencies, necessitates a day off.

#100 Days of Code Challenge

Useful Links

• For daily upgrades, follow me at:

Ayush Talesara

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🎯 Goals

• Learning Data Structure & Algorithms.

• Solving Problem On DSA.

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📈 100DaysOfCode Day-to-Day Progress

📅 DAY 101

• 📆 03-11-2022 THRUSDAY

• Selection Sort
• Bubble Sort
• Insertataion Sort

📅 DAY 102

• 📆 04-11-2022 FRIDAY

• Reverse a array
• Merge Two Sorted Arrays
• Move Zeroes
• Rotate Array

📅 DAY 103

• 📆 05-11-2022 SATURDAY

• Check if Array Is Sorted and Rotated
• Reverse a String
• Find sum of 2 array

📅 DAY 104

• 📆 06-11-2022 SUNDAY

• Check If The String Is A Palindrome
• 125. Valid Palindrome

📅 DAY 105

• 📆 07-11-2022 MONDAY

• Reverse Words in a String II
• Maximum Occurring Character
• Replace Spaces
• 1910.Remove All Occurrences of a Sub-string
• 567. Permutation in String
• 1047.Remove All Adjacent Duplicates In String
• 443. String Compression

📅 DAY 106

• 📆 08-11-2022 TUESDAY

• Print Like A Wave
• 54. Spiral Matrix
• Rotate Image
• 74. Search a 2D Matrix
• 240. Search a 2D Matrix II

📅 DAY 107

• 📆 09-11-2022 WEDNESDAY

• 204. Count Primes using (Sieve of Eratosthenes)
• 204. Count Primes using (Segmented Sieve)
• gcd (hcf)
• Modular Exponentiation
• Pointers

📅 DAY 108

• 📆 10-11-2022 THRUSDAY

• Double Pointers
• Reference Variable Static vs Dynamic Memory
• Dynamic Memory Allocation of 2D Arrays
• Macros
• Global Variables
• Inline Functions
• Default Args

📅 DAY 109

• 📆 11-11-2022 FRIDAY

• Recursion
• Factorial
• Power of 2
• 509. Fibonacci Number
• Count Ways To Reach The N-th Stairs
• Say Digit's

📅 DAY 110

• 📆 12-11-2022 SATURDAY

• Check If an Array Is Sorted Or not using recursion
• Sum of an Array using recursion
• Linear Search in an Array using recursion
• Binary Search in an Array using recursion
• Reverse a String using recursion
• Check Palindrome
• power function
• Bubble Sort using Recursion

📅 DAY 111

• 📆 13-11-2022 SUNDAY

• Merge Sort
• Quick Sort

📅 DAY 112

• 📆 14-11-2022 MONDAY

• 78. Subsets
• Subsequences of String

📅 DAY 113

• 📆 15-11-2022 TUESDAY

• 17. Letter Combinations of a Phone Number

• 46. Permutations

• Rat in a Maze Problem - I

📅 DAY 114

• 📆 16-11-2022 WEDNESDAY

• Time Space Complexity of Recursive Algorithms

📅 DAY 115

• 📆 17-11-2022 THRUSDAY

• Time Space Complexity MCQ'S (Solve)
• OOP's (Revision)
• Singly Linked-list

📅 DAY 116

• 📆 18-11-2022 FRIDAY

• Doubly Linkedklist
• Circular Linkedklist
• Doubly Circular Linked List

📅 DAY 117

• 📆 19-11-2022 SATURDAY

• Reverse Linked List using Iteration
• Reverse Linked List using Recursively Method-1
• Reverse Linked List using Recursively Method-2
• Reverse a Doubly Linked List using Iteration
• Middle Of Linked List Method -1
• Middle Of Linked List Method -2

📅 DAY 118

• 📆 20-11-2022 Sunday

• Reverse List In K Groups
• Check if Linkedlist is circular or not
• Detect and Remove Loop (2-Methods)

📅 DAY 119

• 📆 21-11-2022 Monday

• Is it a Circular Linked List?
• Remove Duplicates From Sorted List
• Remove Duplicates From an Unsorted Linked List
• Sort linked list of 0s 1s 2s

📅 DAY 120

• 📆 22-11-2022 Tuesday

• Merge Two Sorted Linked Lists
• Check if Linked List is Palindrome
• Add two numbers represented by linked lists

📅 DAY 121

• 📆 23-11-2022 Wenesday

• Clone a linked list with next and random pointer
• Merge Sort Linked List

📅 DAY 122

• 📆 24-11-2022 Thrusday

• Implementation of stack using array
• Implementation of stack using linkedlist
• Two Stacks

📅 DAY 123

• 📆 25-11-2022 Friday

• Reverse a string using Stack
• Delete middle element from stack
• Valid Parentheses
• Insert An Element At Its Bottom In A Given Stack

📅 DAY 124

• 📆 26-11-2022 Saturday

• Reverse Stack Using Recursion
• Sort a Stack
• Redundant Brackets
• Minimum Cost To Make String Valid
• Next Smaller Element
• 84. Largest Rectangle in Histogram

📅 DAY 125

• 📆 27-11-2022 Sunday

• The Celebrity Problem
• Max rectangle

📅 DAY 126

• 📆 28-11-2022 Monday

• N Stacks In An Array
• Design a stack that supports getMin() in O(1) time and O(1) extra space

📅 DAY 127

• 📆 29-11-2022 Tuesday

• Implementation Queue using Array
• Implement a Queue Linkedlist
• Implement a Circular Queue
• Implement Deque

📅 DAY 128

• 📆 30-11-2022 Wednesday

• Queue Reversal
• First negative integer in every window of size k
• Reverse First K elements of Queue
• First non-repeating character in a stream
• Circular tour

📅 DAY 129

• 📆 01-12-2022 Thrusday

• 225. Implement Stack using Queues
• Implement Stack using Only One Queues
• Interleave The First Half Of The Queue With The Second Half
• implement k Queues in a single array
• Sum of minimum and maximum elements of all sub-arrays of size k.

📅 DAY 130

• 📆 02-12-2022 Friday

• implantation of binary tree
• Level Order Traversal
• Reverse Level Order Traversal
• Inorder , Preorder , Postorder Traversal

📅 DAY 131

• 📆 03-12-2022 Saturday

• Count Leaf Nodes
• Height of Binary Tree
• Diameter of a Binary Tree
• Check for Balanced Tree
• 100. Same Tree
• Sum Tree

📅 DAY 132

• 📆 04-12-2022 Sunday

• ZigZag Tree Traversal
• Boundary Traversal of binary tree
• Vertical Traversal of Binary Tree

📅 DAY 133

• 📆 05-12-2022 Monday

• Top View of Binary Tree
• Bottom View of Binary Tree
• Left View of Binary Tree

📅 DAY 134

• 📆 06-12-2022 Tuesday

• Right View of Binary Tree
• Sum of the Longest Bloodline of a Tree

📅 DAY 135

• 📆 07-12-2022 Wenesday

• Lowest Common Ancestor in a Binary Tree

📅 DAY 136

• 📆 08-12-2022 Thrusday

• K Sum Paths or 437. Path Sum III
• Kth Ancestor in a Tree
• Maximum sum of Non-adjacent nodes
• Construct Tree from Inorder & Preorder
• Tree from Postorder and Inorder

📅 DAY 137

• 📆 09-12-2022 Friday

• Burning Tree
• Morris traversal for Inorder
• Flatten binary tree to linked list

📅 DAY 138

• 📆 10-12-2022 Saturday

• Binary Search Tree Implementation (Insertion)
• 700. Search in a Binary Search Tree (Iterative & Recursive )

📅 DAY 139

• 📆 11-12-2022 Sunday

• Minimum element in BST
• Maximum element in BST
• Predecessor And Successor In BST (Iterative && Recursive)
• Deletion in Binary search Tree

📅 DAY 140

• 📆 12-12-2022 Monday

• Check for BST
• Find K-th smallest Element in BST
• Kth largest element in BST
• LCA of Two Nodes In A BST
• Find a pair with given target in BST
• Flatten BST To A Sorted List
• Normal BST To Balanced BST
• Preorder traversal of a BST

📅 DAY 141

• 📆 13-12-2022 Tuesday

• Merge Two BSTs
• Largest BST

📅 DAY 142

• 📆 14-12-2022 Wenesday

• Implementation of heap and its function insertion deletion
• Build max heap ( heapify )
• Build Heap
• Build Min Heap
• Heap Sort
• Priority Queue
• Kth smallest element
• Kth largest element

📅 DAY 143

• 📆 15-12-2022 Thrusday

• Is Binary Tree Heap
• Merge two binary Max heaps
• Minimum Cost of ropes
• Convert BST to Min Heap

📅 DAY 144

• 📆 16-12-2022 Friday

• K-th Largest Sum Subarray ( Brute-Force && Heap )
• Merge K Sorted Arrays
• Merge k sorted lists

📅 DAY 145

• 📆 17-12-2022 Saturday

• Smallest Range From K Sorted List
• Median in a stream

📅 DAY 146

• 📆 17-12-2022 Saturday

• HashMaps (Order Maps && Unordered Maps )
• Maximum Frequency Number

📅 DAY 147

• 📆 18-12-2022 Monday

• Bucket Array (Theory for Hash-maps)
• Implement Trie
• longest Common Prefix

📅 DAY 148

• 📆 19-12-2022 Tuesday

• Implement a phone directory

📅 DAY 149

• 📆 30-12-2022 Friday

• Rat In A Maze

📅 DAY 150

• N Queens

📅 DAY 151

• 📆 31-12-2022 Saturday

• Sudoku Solver
• Graph : adjacent to list
• Creating and Printing

📅 DAY 152

• 📆 01-01-2023 Sunday

• BFS in Graph

📅 DAY 153

• 📆 02-01-2023 Monday

• DFS Traversal
• Cycle Detection In Undirected Graph - Using BFS
• Cycle Detection In Undirected Graph - Using DFS
• Detect Cycle In A Directed Graph

📅 DAY 154

• 📆 03-01-2023 Tuesday

• Topological Sort Using -DFS
• Topological Sort Using - BFS/Kahn'S Algo
• Detect Cycle In A Directed Graph Using - Kahn's Algo
• Shortest path in an unweighted graph

📅 DAY 155

• 📆 04-01-2023 Wenesday

• Shortest path in Directed Acyclic Graph

📅 DAY 156

• 📆 05-01-2023 Thrusday

• Implementing Dijkstra Algorithm

📅 DAY 157

• 📆 06-01-2023 Friday

• Prim's MST
• Minimum Spanning Tree Using Kruskals

📅 DAY 158

• 📆 07-01-2023 Saturday

• Bridges In A Graph
• Articulation Point - I

📅 DAY 159

• 📆 08-01-2023 Sunday

• Count Strongly Connected Components (Kosaraju’s Algorithm)
• Bellman Ford

📅 DAY 160

• 📆 09-01-2023 Monday

• Nth Fibonacci Number -4 ways
• 746. Min Cost Climbing Stairs -4 ways

📅 DAY 161

• 📆 10-01-2023 Tuesday

• Minimum Elements / Number of Coins
• Maximum sum of non-adjacent elements / Stickler Thief

📅 DAY 162

• 📆 11-01-2023 Wenesday

• House Robber II
• Cut Into Segments

📅 DAY 163

• 📆 12-01-2023 Thrusday

• Count derangement
• Ninja And The Fence

📅 DAY 164

• 📆 20-02-2023 Monday

• 0 1 Knapsack

📅 DAY 165

• 📆 21-02-2023 Tuesday

• Combination Sum IV
• Get Minimum Squares
• Ninja's Trip

📅 DAY 166

• 📆 22-02-2023 Wenesday

• Largest square formed in a matrix
• 1039. Minimum Score Triangulation of Polygon

📅 DAY 167

• 📆 23-02-2023 Thrusday

• 1824. Minimum Sideway Jumps
• 1402. Reducing Dishes
• Longest Increasing Subsequence
• 1691. Maximum Height by Stacking Cuboids
• 1388. Pizza With 3n Slices

📅 DAY 168

• 📆 24-02-2023 Friday

• Dice throw
• Partition Equal Subset Sum
• 801. Minimum Swaps To Make Sequences Increasing
• Longest Arithmetic Progression
• 1218. Longest Arithmetic Subsequence of Given Difference
• 96. Unique Binary Search Trees

📅 DAY 169

• 📆 25-02-2023 Saturday

• 375. Guess Number Higher or Lower II
• 1130. Minimum Cost Tree From Leaf Values

📅 DAY 170

• 📆 26-02-2023 Sunday

• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 123. Best Time to Buy and Sell Stock III
• 188. Best Time to Buy and Sell Stock IV
• 714. Best Time to Buy and Sell Stock with Transaction Fee

📅 DAY 171

• 📆 27-02-2023 Monday

• 1143. Longest Common Subsequence
• 516. Longest Palindromic Subsequence
• 72. Edit Distance
• 85. Maximal Rectangle
• 44. Wildcard Matching
• N meetings in one room
• Shop in Candy Store
• Check if it is possible to survive on Island
• Reverse words in a given string

📅 DAY 172

• 📆 28-02-2023 Tuesday

1. Introduction to HTML

• Introduction to HTML
• The Anatomy of HTML tag
• Start Building HTML personal site
• What is the HTML Boilerplate
• How to structure Text in HTML
• HTML lists
• HTML Image Elements
• HTML Links and Anchor Tags

2. Intermediate HTML

• HTML Tables
• Using HTML tables for Layout
• HTML Table Code Challenge
• HTML Forms
• Create a Feedback Form with user login
• Publishing a website

📅 DAY 173

• 📆 01-03-2023 Wenesday

• Inline CSS
• Internal CSS
• External CSS
• How to Debug CSS Code
• The Anatomy of CSS Syntax
• CSS Selectors
• Classes vs. Ids

📅 DAY 174

• 📆 02-03-2023 Thrusday

*[x] Favicon *[x] The Box Model of Website Styling *[x] Display Property *[x] Static and Relative Positioning *[x] Absolute positioning *[x] The Dark Art of Centering Elements *[x] Font Styling

📅 DAY 175

• 📆 03-03-2023 Friday

• CSS Font Property Challenge
• CSS Float and Clear
• Stylised Personal Site
• Final Walkthrough

📅 DAY 176

• 📆 04-03-2023 Saturday

• What is Bootstrap
• Web Design 101 - Wireframing
• The Bootstrap Navigation Bar

📅 DAY 177

• 📆 05-03-2023 Sunday

• Bootstrap Grid Layout System
• Adding Grid Layouts to Our Website
• Bootstrap Containers
• Bootstrap Buttons & Font Awesome
• Styling Our Website Challenges and Solutions

📅 DAY 178

• 📆 06-03-2023 Monday

• The Bootstrap Carousel
• Bootstrap Cards

📅 DAY 179

• 📆 07-03-2023 Tuesday

• [x]The CSS Z-Index and Stacking Order

📅 DAY 180

• 📆 11-03-2023 Saturday

• Media Query Breakpoints
• Made the website fully responsive for Mobile as well as Tab

📅 DAY 181

• 📆 13-03-2023 Sunday

• Advanced CSS - Combining Selectors

• Refactoring our Website

• Advanced CSS - Selector Priority

• Completing the Website

• Introduction to Web Design

• Understanding Colour Theory

• Understanding Typography and How to Choose a Font

• Manage ATTENTION with effective User Interface (UI) Design

• User Experience (UX) Design

• Web Design in Practice - Let's apply what we've learnt!

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• Javascript Alerts - Adding Behaviour to Websites

• Data Types

• Javascript Variables

• Javascript Variables Exercise

• Naming and Naming Conventions for Javascript Variables

• String Concatenation

• String Lengths and Retrieving the Number of Characters

• Slicing and Extracting Parts of a String

📅 DAY 182

• 📆 14-03-2023 Monday

• Basic Arithmetic and the Modulo Operator in Javascript
• Increment and Decrement Expressions
• Functions Part 1 Creating and Calling Functions
• Functions Part 1 Challenge - The Karel Robot
• Functions Part 2 Parameters and Arguments
• Life in Weeks
• Functions Part 3 Outputs & Return Values
• Challenge Create a BMI Calculator

Intermediate Java Script

• Random Number Generation in Javascript Building a Love Calculator
• Control Statements Using If-Else Conditionals & Logic
• Comparators and Equality
• Combining Comparators
• the Leap Year Code Challenge
• Collections Working with Javascript Arrays
• Adding Elements and Intermediate Array Techniques
• Who's Buying Lunch
• Control Statements While Loops
• Control Statements For Loops
• the Fibonacci Code Challenge

📅 DAY 183

• 📆 15-03-2023 Tuesday

• The Document Object Model (DOM)
• Adding Javascript to Websites
• Introduction to the Document Object Model (DOM)
• Selecting HTML Elements with Javascript
• Manipulating and Changing Styles of HTML Elements with Javascript
• The Separation of Concerns Structure vs Style vs Behaviour
• Text Manipulation and the Text Content Property
• Manipulating HTML Element Attributes
• Create a Dice project using previous concept

📅 DAY 184

• 📆 16-03-2023 Wenesday

• We'll Make Drum Kit

• Adding Event Listeners to a Button

• Higher Order Functions and Passing Functions as Arguments

• How to Play Sounds on a Website

• A Deeper Understanding of Javascript Objects

• How to Use Switch Statements in Java script

• Objects, their Methods and the Dot Notation

• Using Keyboard Event Listeners to Check for Key Presses

• Understanding Callbacks and How to Respond to Events

• Adding Animation to Websites

📅 DAY 185

• 📆 17-03-2023 Thrusday

• DMBS

• What is Data

• What is Information

• Data Vs Information

• How businesses can leverage data and Information

• What is Database

• What is DBMS

• Why don't we use File System Instead of DBMS

• What is Abstraction?

• Three Schema Architecture | View of Data | Abstraction provided by DBMS

• Database Instance

• Importance of Logical Schema

• Brief introduction to Data Models

• Database Languages

• How is Database accessed from Application Programs?

• Database Administrator (Who is DBA?)

• DBMS Application Architecture (Tier 1, Tier 2 and Tier 3)

• What is Entity?

• What is Entity set?

• What are Attributes?

• What are Relationships between Entities?

• Define ER Model and ER Diagram

• Attribute Consistency Constraints

• Types of Attributes (Composite/Multivalued/Derived Attributes)

• What does NULL specifies in Database?

• What are Strong and Weak Relationships?

• Degree of Relationship (Unary/Binary/Ternary Relationships)

• Mapping Cardinality (1:1, 1:N, N:1, N:M)

• Participation Constraints (Partial & Total Participation)

• What is Specialization?

• What is Generalization?

• Are Specialization and Generalization different in terms of ER Diagram?

• Attribute inheritance

• Participation inheritance

• What is Aggregation?

• Steps to make ER Diagram

• Requirement Engineering

• Step 1: Identify Entity sets

• Step 2: Identify Attributes and their types

• Step 3: Identify Relationships and Constraints

• Final ER Diagram

📅 DAY 186

• 📆 18-03-2023 Friday

• ON DELETE CASCADE / ON DELETE SET NULL (Referential Constraint overcome methods)
• REPLACE vs INSERT
• JOINS (INNER JOIN/OUTER JOINS/SELF JOIN etc)
• JOIN without using JOIN keywords
• SET operations in SQL (UNION/INTERSECT/MINUS)
• Sub-queries in SQL
• Views in SQL

📅 DAY 187

• 📆 19-03-2023 Saturday

• 50 Most Common SQL Queries for Interviews

📅 DAY 188

• 📆 20-03-2023 Sunday

• What is Functional Dependency?
• Armstrong's Axioms
• Why Normalisation is necessary?
• Anomalies due to redundant data
• Insertion Anomaly
• Deletion Anomaly
• Updation Anomaly
• What we actually do in Normalisation?
• Types of Normal Forms
• 1NF
• 2NF
• 3NF
• BCNF

📅 DAY 189

• 📆 21-03-2023 Monday

• How to Implement Atomicity and Durability?

• Shadow Copy Scheme

• Log based Recovery Methods

• Why Indexing is used?

• Primary Index / Clustering Index

• Dense Index VS Sparse Index

• Multi-level Index

• Secondary Index

• Brief introduction to NoSQL Databases

• History behind NoSQL evolution

• Data modeling in NoSQL

• Advantages of NoSQL databases

• When to use NoSQL?

• Misconception about NoSQL

• Types on NoSQL databases | Key Values stores

• Columnar NoSQL

• Document based stores

• Graph based stores

• Disadvantages of NoSQL

• SQL vs NoSQL

• Types of Databases

• Relational Databases

• Object-Oriented Databases

• NoSQL Databases

• Hierarchical Databases

• Network Databases

• What is Clustering / Replication

📅 DAY 190

• 📆 22-03-2023 Tuesday

• Database Optimisation Techniques
• Scale-up DB Optimisation
• Replica Set (Clustering)
• Partitioning for scaling out the DB
• What is Sharding?
• Query Optimisation and DB Connection Pooling
• Vertical Scaling (Scale-Up)
• Command Query Responsibility Segregation (CQRS)
• Multi Primary Replication
• Partitioning of Data by Functionality
• Horizontal Scaling (Scale-out)
• Establish Multiple Data Centres
• CAP Theorem in DBMS
• Master-Slave Architecture

📅 DAY 191

• 📆 23-03-2023 Wednesday

• Opacity / Transparency

• Selectors

• CSS Font Property Challenge

• CSS Float and Clear

• Backgrounds

• Background Image ,Attachment ,Repeat

• Borders Padding Margin

• height width

• Outline

• Style a website using css concept

📅 DAY 192

• 📆 24-03-2023 Thrusday

• Box-Sizing

• Absolute Position

• Position and Offset Properties

• Fixed Position and Sticky Position

• Font-Family

• @Font Face Descriptor

• Font Weight

• Font Size

• Font Style

• Text Align

• Text Transform

• Text Indent

• Line Height

• Word Spacing and Letter Spacing

• Text Decoration

• Text Shadow

• White Space

• Text Direction

• Selectors - Grouping Selectors - Universal Selector

• Selectors - Class Selector

• ID vs Class Selector

• Style a website using CSS concept

📅 DAY 193

• 📆 25-03-2023 Friday

• Descendant Selector ( space )
• Child Selector ( > )
• Universal Selector ( * )
• Pseudo-classes( : )
• Pseudo-elements( :: )
• Attribute Selector ( [ ] )

📅 DAY 194

• 📆 26-03-2023 Saturday

• before selector
• after selector
• Navigation bar

📅 DAY 195

• 📆 27-03-2023 Sunday

• Flex box

📅 DAY 196

• 📆 28-03-2023 Monday

• Dropdown Menu
• counter-increment
• Calc()
• Gradients
• Transform

📅 DAY 197

• 📆 29-03-2023 Tuesday

• Clip an image to text
• Button Hover Animation Effects
• Css Columns

📅 DAY 198

• 📆 30-03-2023 Wednesday

• How To Make Tooltips With Only CSS

• How to use CSS object-fit to control your images

• Mask-image lets you do some really cool stuff

• Clip an image to text with CSS