• 10 Days of Statistics
• 30 Days of Code
• Algorithms
• Cracking the Coding Interview
• Data Structures
• General Programming
• Implementation
• Java
• SQL

Solutions are coded using Java 8

SQL solutions are coded using MySQL

10 Days of Statistics, Day, Challenge, Points, Solution, :---:, :--------------------------------------------------------------------------------------------------------------------------:, :------:, :-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Mean, Median, and Mode, 30, Solution.java, Weighted Mean, 30, Solution.java, 1, Quartiles, 30, Solution.java, 1, Interquartile Range, 30, Solution.java, 1, Standard Deviation, 30, Solution.java, 2, Basic Probability, 10, Solution, 2, More Dice, 10, Solution, 2, Compound Event Probability, 10, Solution, 3, Conditional Probability, 10, Solution, 3, Cards of the Same Suit, 10, Solution, 3, Drawing Marbles, 10, Solution, 4, Binomial Distribution I, 30, Solution.java, 4, Binomial Distribution II, 30, Solution.java, 4, Geometric Distribution I, 30, Solution.java, 4, Geometric Distribution II, 30, Solution.java, 5, Poisson Distribution I, 30, Solution.java, 5, Poisson Distribution II, 30, Solution.java, 5, Normal Distribution I, 30, Solution.java, 5, Normal Distribution II, 30, Solution.java, 6, The Central Limit Theorem I, 30, Solution.java, 6, The Central Limit Theorem II, 30, Solution.java, 6, The Central Limit Theorem III, 30, Solution.java, 7, Pearson Correlation Coefficient I, 30, Solution.java, 7, Spearman's Rank Correlation Coefficient, 30, Solution.java, 8, Least Square Regression Line, 30, Solution.java, 8, Pearson Correlation Coefficient II, 30, Solution, 9, Multiple Linear Regression, 30, Solution.java, # 30 Days of Code, Day, Challenge, Points, Solution, :---:, :-------------------------------------------------------------------------------------------------------:, :------:, :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Hello, World, 30, Solution.java, 1, Data Types, 30, Solution.java, 2, Operators, 30, Solution.java, 3, Intro to Conditional Statements, 30, Solution.java, 4, Class vs. Instance, 30, Solution.java, 5, Loops, 30, Solution.java, 6, Let's Review, 30, Solution.java, 7, Arrays, 30, Solution.java, 8, Dictionaries and Maps, 30, Solution.java, 9, Recursion, 30, Solution.java, 10, Binary Numbers, 30, Solution.java, 11, 2D Arrays, 30, Solution.java, 12, Inheritance, 30, Solution.java, 13, Abstract Classes, 30, Solution.java, 14, Scope, 30, Solution.java, 15, Linked List, 30, Solution.java, 16, Exceptions - String to Integer, 30, Solution.java, 17, More Exceptions, 30, Solution.java, 18, Queues and Stacks, 30, Solution.java, 19, Interfaces, 30, Solution.java, 20, Sorting, 30, Solution.java, 21, Generics, 30, Solution.java, 22, Binary Search Trees, 30, Solution.java, 23, BST Level-Order Traversal, 30, Solution.java, 24, More Linked Lists, 30, Solution.java, 25, Running Time and Complexity, 30, Solution.java, 26, Nested Logic, 30, Solution.java, 27, Testing, 30, Solution.java, # Algorithms, Subdomain, Challenge, Points, Solution, :-----------------------:, :-----------------------------------------------------------------------------------------------------------------------------------:, :------:, :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Sorting, Quicksort 1 - Partition, 10, Solution.java, Sorting, Marc's Cakewalk, 15, Solution.java, Sorting, Minimum Absolute Difference in an Array, 15, Solution.java, Sorting, Luck Balance, 20, Solution.java, Sorting, Insertion Sort - Part 1, 30, Solution.java, Sorting, Insertion Sort - Part 2, 30, Solution.java, Sorting, Correctness and the Loop Invariant, 30, Solution.java, Sorting, Running Time of Algorithms, 30, Solution.java, Sorting, Quicksort 2 - Sorting, 30, Solution.java, Sorting, Counting Sort 1, 30, Solution.java, Sorting, Counting Sort 2, 30, Solution.java, Sorting, Counting Sort 3, 30, Solution.java, Sorting, Intro to Tutorial Challenges, 30, Solution.java, Sorting, Quicksort In-Place, 35, Solution.java, Sorting, Running Time of Quicksort, 35, Solution.java, Sorting, The Full Counting Sort, 40, Solution.java, Search, Ice Cream Parlor, 30, Solution.java, Search, Connected Cells in a Grid, 50, Solution.java, Greedy, Grid Challenge, 20, Solution.java, Greedy, Maximum Perimeter Triangle, 20, Solution.java, Greedy, Beautiful Pairs, 30, Solution.java, Graph Theory, Breadth First Search - Shortest Reach, 55, Solution.java, Strings, Super Reduced String, 10, Solution.java, Strings, CamelCase, 15, Solution.java, Strings, Two Characters, 15, Solution.java, Strings, Caesar Cipher, 15, Solution.java, Strings, Mars Exploration, 15, Solution.java, Strings, Weighted Uniform Strings, 20, Solution.java, Strings, Gemstones, 20, Solution.java, Strings, Alternating Characters, 20, Solution.java, Strings, Beautiful Binary String, 20, Solution.java, Strings, The Love-Letter Mystery, 20, Solution.java, Strings, String Construction, 25, Solution.java, Dynamic Programming, The Coin Change Problem, 60, Solution.java, Bit Manipulation, Lonely Integer, 20, Solution.java, Bit Manipulation, Bit Manipulation: Lonely Integer, 20, Solution.java, Bit Manipulation, Sum vs XOR, 25, Solution.java, Bit Manipulation, Maximizing XOR, 30, Solution.java, Bit Manipulation, Sansa and XOR, 30, Solution.java, Bit Manipulation, Counter game, 30, Solution.java, # Cracking the Coding Interview, Topic, Challenge, Points, Solution, :---------------------:, :--------------------------------------------------------------------------------------------------------:, :------:, :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Techniques / Concepts, Time Complexity: Primality, 15, Solution.java, Techniques / Concepts, Recursion: Fibonacci Numbers, 20, Solution.java, Techniques / Concepts, Recursion: Davis' Staircase, 30, Solution.java, Techniques / Concepts, DP: Coin Change, 30, Solution.java, Techniques / Concepts, Bit Manipulation: Lonely Integer, 60, Solution.java, Data Structures, Arrays: Left Rotation, 20, Solution.java, Data Structures, Strings: Making Anagrams, 25, Solution.java, Data Structures, Hash Tables: Ransom Note, 25, Solution.java, Data Structures, Linked Lists: Detect a Cycle, 25, Solution.java, Data Structures, Stacks: Balanced Brackets, 30, Solution.java, Data Structures, Queues: A Tale of Two Stacks, 30, Solution.java, Data Structures, Trees: Is This a Binary Search Tree?, 30, Solution.java, Data Structures, Heaps: Find the Running Median, 50, Solution.java, Data Structures, Tries: Contacts, 50, Solution.java, Algorithms, Sorting: Bubble Sort, 30, Solution.java, Algorithms, Sorting: Comparator, 35, Solution.java, Algorithms, Merge Sort: Counting Inversions, 35, Solution.java, Algorithms, Binary Search: Ice Cream Parlor, 45, Solution.java, Algorithms, DFS: Connected Cell in a Grid, 45, Solution.java, Algorithms, BFS: Shortest Reach in a Graph, 45, Solution.java, # Data Structures, Subdomain, Challenge, Points, Solution, :---------------:, :------------------------------------------------------------------------------------------------------------------------------------------------------:, :------:, :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Arrays, Arrays - DS, 10, Solution.java, Arrays, 2D Array - DS, 15, Solution.java, Arrays, Dynamic Array, 15, Solution.java, Arrays, Left Rotation, 20, Solution.java, Arrays, Sparse Arrays, 25, Solution.java, Arrays, Algorithmic Crush, 60, Solution.java, Stacks, Maximum Element, 20, Solution.java, Stacks, Balanced Brackets, 25, Solution.java, Trees, Tree: Preorder Traversal, 10, Solution.java, Trees, Tree: Inorder Traversal, 10, Solution.java, Trees, Tree: Postorder Traversal, 10, Solution.java, Trees, Tree: Height of a Binary Tree, 10, Solution.java, Trees, Tree: Level Order Traversal, 20, Solution.java, Trees, Tree: Huffman Decoding, 20, Solution.java, Trees, Binary Search Tree: Insertion, 20, Solution.java, Trees, Binary Search Tree: Lowest Common Ancestor, 30, Solution.java, Trees, Is This a Binary Search Tree?, 30, Solution.java, Trees, Swap Nodes [Algo], 40, Solution.java, Trees, Square-Ten Tree, 60, Solution.java, Linked List, Print the Elements of a Linked List, 5, Solution.java, Linked List, Insert a node at the head of a linked list, 5, Solution.java, Linked List, Insert a Node at the Tail of a Linked List, 5, Solution.java, Linked List, Insert a node at a specific position in a linked list, 5, Solution.java, Linked List, Delete a Node, 5, Solution.java, Linked List, Print in Reverse, 5, Solution.java, Linked List, Reverse a linked list, 5, Solution.java, Linked List, Compare two linked lists, 5, Solution.java, Linked List, Merge two sorted linked lists, 5, Solution.java, Linked List, Get Node Value, 5, Solution.java, Linked List, Delete duplicate-value nodes from a sorted linked list, 5, Solution.java, Linked List, Cycle Detection, 5, Solution.java, Linked List, Find Merge Point of Two Lists, 5, Solution.java, Linked List, Inserting a Node Into a Sorted Doubly Linked List, 5, Solution.java, Linked List, Reverse a doubly linked list, 5, Solution.java, Tries, Contacts, 40, Solution.java, Queues, Queue using Two Stacks, 30, Solution.java, Heaps, Find the Running Median, 50, Solution.java, Multiple Choice, Data Structures MCQ 1, 5, Solution, Multiple Choice, Data Structures MCQ 2, 5, Solution, Multiple Choice, Data Structures MCQ 3, 5, Solution, # General Programming, Subdomain, Challenge, Points, Solution, :---------------------------:, :----------------------------------------------------------------------------------------------------------------------------:, :------:, :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Basic Programming, Solve Me First, 1, Solution.java, Basic Programming, Staircase, 10, Solution.java, Basic Programming, Plus Minus, 10, Solution.java, Basic Programming, Diagonal Difference, 10, Solution.java, Basic Programming, A Very Big Sum, 10, Solution.java, Basic Programming, Simple Array Sum, 10, Solution.java, Basic Programming, Compare the Triplets, 10, Solution.java, Basic Programming, Divisible Sum Pairs, 10, Solution.java, Basic Programming, Kangaroo, 10, Solution.java, Basic Programming, Drawing Book, 10, Solution.java, Basic Programming, Birthday Cake Candles, 10, Solution.java, Basic Programming, Bon Appetit, 10, Solution.java, Basic Programming, Sock Merchant, 10, Solution.java, Basic Programming, Apple and Orange, 10, Solution.java, Basic Programming, Between Two Sets, 10, Solution.java, Basic Programming, Mini-max Sum, 10, Solution.java, Basic Programming, Grading Students, 10, Solution.java, Basic Programming, Breaking the Records, 10, Solution.java, Basic Programming, Migratory Birds, 10, Solution.java, Basic Programming, Birthday Chocolate, 10, Solution.java, Basic Programming, Time Conversion, 15, Solution.java, Basic Programming, Library Fine, 15, Solution.java, Basic Programming, Save the Prisoner!, 15, Solution.java, Basic Programming, Jumping on the Clouds - Revisited, 15, Solution.java, Basic Programming, Counting Valleys, 15, Solution.java, Basic Programming, Viral Advertising, 15, Solution.java, Basic Programming, Beautiful Days at the Movies, 15, Solution.java, Basic Programming, Electronics Shop, 15, Solution.java, Basic Programming, Cats and a Mouse, 15, Solution.java, Basic Programming, The Hurdle Race, 15, Solution.java, Basic Programming, Utopian Tree, 20, Solution.java, Basic Programming, Circular Array Rotation, 20, Solution.java, Basic Programming, Sherlock and Squares, 20, Solution.java, Basic Programming, Angry Professor, 20, Solution.java, Basic Programming, Extra Long Factorials, 20, Solution.java, Basic Programming, Minimum Distances, 20, Solution.java, Basic Programming, Jumping on the Clouds, 20, Solution.java, Basic Programming, Equalize the Array, 20, Solution.java, Basic Programming, Designer PDF Viewer, 20, Solution.java, Basic Programming, Repeated String, 20, Solution.java, Basic Programming, Append and Delete, 20, Solution.java, Basic Programming, Picking Numbers, 20, Solution.java, Basic Programming, Climbing the Leaderboard, 20, Solution.java, Basic Programming, Sequence Equation, 20, Solution.java, Basic Programming, Find Digits, 25, Solution.java, Basic Programming, Cut the sticks, 25, Solution.java, Basic Programming, Taum and B'day, 25, Solution.java, Basic Programming, Flatland Space Stations, 25, Solution.java, Basic Programming, Fair Rations, 25, Solution.java, Basic Programming, Manasa and Stones, 30, Solution.java, Object-Oriented Programming, Class vs. Instance, 30, Solution.java, Object-Oriented Programming, Inheritance, 30, Solution.java, Object-Oriented Programming, Abstract Classes, 30, Solution.java, RegEx, HackerRank in a String!, 20, Solution.java, # Implementation, Subdomain, Challenge, Points, Solution, :-----------:, :------------------------------------------------------------------------------------------------------:, :------:, :----------------------------------------------------------------------------------------------------------------------------------------------------------:, Brute Force, Pangrams, 20, Solution.java, Brute Force, Strings: Making Anagrams, 25, Solution.java, Brute Force, Making Anagrams, 30, Solution.java, Brute Force, Modified Kaprekar Numbers, 30, Solution.java, # Java, Subdomain, Challenge, Points, Solution, :---------------------------:, :------------------------------------------------------------------------------------------------------------------------:, :------:, :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:, Introduction, Welcome to Java!, 3, Solution.java, Introduction, Java Stdin and Stdout I, 5, Solution.java, Introduction, Java If-Else, 10, Solution.java, Introduction, Java Stdin and Stdout II, 10, Solution.java, Introduction, Java Output Formatting, 10, Solution.java, Introduction, Java Loops I, 10, Solution.java, Introduction, Java Loops II, 10, Solution.java, Introduction, Java Datatypes, 10, Solution.java, Introduction, Java End-of-file, 10, Solution.java, Introduction, Java Static Initializer Block, 10, Solution.java, Introduction, Java Int to String, 10, Solution.java, Introduction, Java Date and Time, 15, Solution.java, Introduction, Java Currency Formatter, 15, Solution.java, Strings, Java Strings Introduction, 5, Solution.java, Strings, Java Substring, 5, Solution.java, Strings, Java String Compare, 10, Solution.java, Strings, Java String Reverse, 10, Solution.java, Strings, Java Anagrams, 10, Solution.java, Strings, Java String Tokens, 15, Solution.java, Strings, Pattern Syntax Checker, 20, Solution.java, Strings, Java Regex, 25, Solution.java, Strings, Java Regex 2 - Duplicate Words, 25, Solution.java, Strings, Java Regex 3 - Username Checker, 20, Solution.java, Strings, Tag Content Extractor, 20, Solution.java, BigNumber, Java BigInteger, 10, Solution.java, BigNumber, Java BigDecimal, 20, Solution.java, BigNumber, Java Primality Test, 20, Solution.java, Data Structures, Java 1D Array, 5, Solution.java, Data Structures, Java 2D Array, 10, Solution.java, Data Structures, Java Subarray, 10, Solution.java, Data Structures, Java Arraylist, 10, Solution.java, Data Structures, Java 1D Array (Part 2), 25, Solution.java, Data Structures, Java List, 15, Solution.java, Data Structures, Java Map, 10, Solution.java, Data Structures, Java Stack, 20, Solution.java, Data Structures, Java Hashset, 10, Solution.java, Data Structures, Java Generics, 15, Solution.java, Data Structures, Java Comparator, 10, Solution.java, Data Structures, Java Sort, 10, Solution.java, Data Structures, Java Dequeue, 20, Solution.java, Data Structures, Java BitSet, 20, Solution.java, Object Oriented Programming, Java Inheritance I, 5, Solution.java, Object Oriented Programming, Java Inheritance II, 10, Solution.java, Object Oriented Programming, Java Abstract Class, 10, Solution.java, Object Oriented Programming, Java Interface, 10, Solution.java, Object Oriented Programming, Java Method Overriding, 10, Solution.java, Object Oriented Programming, Java Method Overriding 2 (Super Keyword), 10, Solution.java, Object Oriented Programming, Java Instanceof keyword, 10, Solution.java, Object Oriented Programming, Java Iterator, 15, Solution.java, Object Oriented Programming, Calculating Volume, 20, Solution.java, Exception Handling, Java Exception Handling (Try-catch), 10, Solution.java, Exception Handling, Java Exception Handling, 15, Solution.java, Advanced, Java Varargs - Simple Addition, 15, Solution.java, Advanced, Java Reflection - Attributes, 15, Solution.java, Advanced, Can You Access, 15, Solution.java, Advanced, Prime Checker, 25, Solution.java, Advanced, Java Factory Pattern, 15, Solution.java, Advanced, Java Singleton Pattern, 15, Solution.java, Advanced, Java Visitor Pattern, 40, Solution.java, Advanced, Java Annotations, 25, Solution.java, Advanced, Covariant Return Types, 20, Solution.java, Advanced, Java Lambda Expressions, 30, Solution.java, Advanced, Java MD5, 30, Solution.java, Advanced, Java SHA-256, 30, Solution.java, # SQL, Subdomain, Challenge, Points, Solution, :-------------------:, :----------------------------------------------------------------------------------------------------------------------------:, :------:, :-----------------------------------------------------------------------------------------------------------------------------------------------------------:, Basic Select, Revising the Select Query I, 10, MySQL Solution, Basic Select, Revising the Select Query II, 10, MySQL Solution, Basic Select, Select All, 10, MySQL Solution, Basic Select, Select By ID, 10, MySQL Solution, Basic Select, Japanese Cities' Attributes, 10, MySQL Solution, Basic Select, Japanese Cities' Names, 10, MySQL Solution, Basic Select, Weather Observation Station 1, 15, MySQL Solution, Basic Select, Weather Observation Station 3, 10, MySQL Solution, Basic Select, Weather Observation Station 4, 10, MySQL Solution, Basic Select, Weather Observation Station 5, 30, MySQL Solution, Basic Select, Weather Observation Station 6, 10, MySQL Solution, Basic Select, Weather Observation Station 7, 10, MySQL Solution, Basic Select, Weather Observation Station 8, 15, MySQL Solution, Basic Select, Weather Observation Station 9, 10, MySQL Solution, Basic Select, Weather Observation Station 10, 10, MySQL Solution, Basic Select, Weather Observation Station 11, 15, MySQL Solution, Basic Select, Weather Observation Station 12, 15, MySQL Solution, Basic Select, Higher Than 75 Marks, 15, MySQL Solution, Basic Select, Employee Names, 10, MySQL Solution, Basic Select, Employee Salaries, 10, MySQL Solution, Basic Join, Asian Population, 10, MySQL Solution, Basic Join, African Cities, 10, MySQL Solution, Basic Join, Average Population of Each Continent, 10, MySQL Solution, Basic Join, The Report, 20, MySQL Solution, Aggregation, Revising Aggregations - The Count Function, 10, MySQL Solution, Aggregation, Revising Aggregations - The Sum Function, 10, MySQL Solution, Aggregation, Revising Aggregations - Averages, 10, MySQL Solution, Aggregation, Average Population, 10, MySQL Solution, Aggregation, Japan Population, 10, MySQL Solution, Aggregation, Population Density Difference, 10, MySQL Solution, Aggregation, The Blunder, 15, MySQL Solution, Aggregation, Top Earners, 20, MySQL Solution, Aggregation, Weather Observation Station 2, 15, MySQL Solution, Aggregation, Weather Observation Station 13, 10, MySQL Solution, Aggregation, Weather Observation Station 14, 10, MySQL Solution, Aggregation, Weather Observation Station 15, 15, MySQL Solution, Aggregation, Weather Observation Station 16, 10, MySQL Solution, Aggregation, Weather Observation Station 17, 15, MySQL Solution, Aggregation, Weather Observation Station 18, 25, MySQL Solution, Aggregation, Weather Observation Station 19, 30, MySQL Solution