Preface

• Preface

Online Judges

• Why, What and How?
• Popular Online Platforms
• Tearing Down a Problem

Time & Space Complexity

• Inroduction to Time Complexity
• Introduction to Space Complexity
• Different Notations in Time Complexity
• Comparing different time complexities
• How to Calculate Time Complexity?
• Quiz: Time Complexity

Control Flow Practice

• if-else and else-if ladder Practice
• Loops Practice 1
• Loops Practice 2
• Loops Practice 3
• Loops Practice 4
• Square Star and Rhombus Star Patterns
• Triangle Star Patterns
• Pyramid Star Patterns
• Miscellaneous Star Patterns
• Number Patterns 1
• Number Patterns 2
• Triangular Number Patterns 1
• Triangular Number Patterns 2
• Triangular Number Patterns 3
• switch Statement Practice

Arrays Basics

• Coming Soon.
• Array I
• Array II
• Array III
• Array IV
• Array V

String Basics

• Coming Soon.

Matrix Basics

• Coming Soon..
• 2D-Arrays I
• 2D- Arrays II
• 2D-Arrays III
• 2D-Arrays IV
• 2D-Arrays V

Math Basics

• Introduction to Basic Math
• Sum Of Digits of A Number
• Reverse a Number
• Check Palindrome
• Armstrong Number
• Factorial of a Number
• Find the number of trailing zeroes in a given factorial of n
• Modulo Arithmetic
• Divisors of a number
• Divisibility Rules
• Number System

Recursion Basics

• Introduction to Recursion - Understand Recursion by Examples
• Getting a hang of Recursion
• Most Asked Recursion Practice Problems with Solutions
• Fast Exponentiation Algorithm: Efficient Power Calculation Explained
• Find whether a given integer is a power of 3: Power of three
• Recursion: Time & Space Complexity Analysis - 1
• Recursion: Time & Space Complexity Analysis - 2
• Time Complexity Analysis Using Recurrence Relations
• Coming Soon..

Sorting

• Bubble Sort Algorithm
• Selection Sort Algorithm
• Insertion Sort Algorithm
• First Missing Positive
• Merge Sort
• Quick Sort
• Counting Sort
• Comparator Sort
• Problems on Comparator Sort
• Largest Number
• Sort the Jumbled Numbers
• Custom Sort String
• Rank Teams by Votes

Two Pointer

• Reverse String
• Merge Strings Alternately
• Minimum Length of String After Deleting Similar Ends
• Merge Two 2D Arrays by Summing Values
• Container with Most Water
• String Compression
• Reverse Prefix of Word
• Separate Black and White Balls
• Merge Sorted Array
• Watering Plants II
• Sort Array By Parity
• Rotate Array
• Sentence Similarity III
• Next Greater Element III
• Next Permutation
• Move Pieces to Obtain a String

Prefix Sum

• Range Sum Query - Immutable
• Subarray Sum Equals K
• Minimum Penalty for a Shop
• Product of Array Except Self
• Sum of Absolute Differences in a Sorted Array
• Find Good Days to Rob the Bank
• Subarray Sums Divisible by K
• Make Sum Divisible by P
• Removing Minimum Number of Magic Beans
• Product of the Last K Numbers
• Count Number of Bad Pairs
• Continuous Subarray Sum
• Count of Interesting Subarrays
• Movement of Robots
• Find All Good Indices
• Count Number of Nice Subarrays
• Maximum Population Year
• Points That Intersect With Cars
• Pongal Bunk
• Car Pooling
• Shifting Letters II
• My Calendar II
• Left and Right Sum Differences

Matrix

• Rotate Image
• Convert 1D Array Into 2D Array
• Row with Maximum ones
• Richest Customer Wealth
• Set Matrix Zeroes
• Queens That Can Attack The King
• Modify the Matrix
• Matrix Diagonal Sum
• Lucky Number in a Matrix
• Check if Matrix Is X-Matrix
• Transpose Matrix
• Spiral Matrix
• Prime In Diagonal
• Maximum Matrix Sum
• Largest Local Values in a Matrix
• Spiral Matrix II

Hashing

• Subarray Sum Equals K
• First Missing Positive
• Isomorphic Strings
• Find Common Elements Between Two Arrays
• Majority Element
• Majority Element II
• Contains Duplicate
• Subarray Sums Divisible by K
• Make Sum Divisible by P
• Count Number of Bad Pairs
• Continuous Subarray Sum
• Count of Interesting Subarrays
• Count Number of Nice Subarrays
• Sum of Unique Elements
• Optimal Partition of String
• Groups of Special-Equivalent Strings
• Word Subsets
• Find the Maximum Number of Elements in Subset
• People Whose List of Favorite Companies Is Not a Subset of Another List
• Custom Sort String
• Count the Number of Good Partitions
• Count Beautiful Substrings II

Sliding Window

• Maximum Number of Occurrences of a Substring
• Longest Substring Without Repeating Characters
• Count the Number of Substrings With Dominant Ones
• Minimum Size Subarray Sum
• Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• Longest Repeating Character Replacement
• Max Consecutive Ones III
• Substrings of Size Three with Distinct Characters
• Minimum Window Substring
• Substring with Concatenation of All Words

Linked List

Stack

• Next Greater Element I
• Merge Intervals
• Insert Interval
• Valid Parentheses
• Asteroid Collision
• Minimum Add to Make Parentheses Valid
• Minimum Remove to Make Valid Parentheses
• Coming Soon..
• Maximum Nesting Depth of the Parentheses
• Reverse Substrings Between Each Pair of Parentheses
• Remove Outermost Parentheses
• Check if a Parentheses String Can Be Valid
• Min Stack
• Maximum Frequency Stack
• Score of Parentheses
• Dinner Plate Stacks

Queue

• Coming Soon..

Binary Search

• Coming Soon..
• Binary Search Algorithm Solution: Iterative & Recursive Ways

Bit Manipulation

• Coming Soon..

Recursion and Backtracking

• Coming Soon..

Trees

• Coming Soon..

Heaps

• Coming Soon..

Tries

• Coming Soon..

Greedy

• Maximum 69 Number
• Maximum Sum With Exactly K Elements
• Minimum Time to Type Word Using Special Typewriter
• Minimum Operations to Make the Array Increasing
• Minimum Number of Operations to Convert Time
• Lemonade Change
• Assign Cookies
• Minimum Cost to Move Chips to The Same Position

Dynamic Programming

Graphs

• Coming Soon..

String Matching Algorithms

Combinatorics

Geometry

Game Theory

Advanced Algorithm