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HackerRank | Practice, Tutorials & Interview Preparation Solutions

This repository consists of solutions to HackerRank practice, tutorials, and interview preparation problems with Python, mySQL, C#, and JavaScript.

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Python SQL 10 Days of JavaScript 10 Days of Statistics 30 Days of Code

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Table Of Contents

Practices Completed

💻 This is my approach of solving the questions of

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Python

Subdomain Challenge Problem Difficulty Score Solution
Introduction Say 'Hello, World!' With Python Problem Easy 5 Solution
Introduction Python If-Else Problem Easy 10 Solution
Introduction Arithmetic Operators Problem Easy 10 Solution
Introduction Python Division Problem Easy 10 Solution
Introduction Loops Problem Easy 10 Solution
Introduction Write a function Problem Medium 10 Solution
Introduction Print Function Problem Easy 20 Solution
Basic Data Types List Comprehensions Problem Easy 10 Solution
Basic Data Types Find the Runner-Up Score! Problem Easy 10 Solution
Basic Data Types Nested Lists Problem Easy 10 Solution
Basic Data Types Finding the percentage Problem Easy 10 Solution
Basic Data Types Lists Problem Easy 10 Solution
Basic Data Types Tuples Problem Easy 10 Solution
Strings sWAP cASE Problem Easy 10 Solution
Strings String Split and Join Problem Easy 10 Solution
Strings What's Your Name? Problem Easy 10 Solution
Strings Mutations Problem Easy 10 Solution
Strings Find a string Problem Easy 10 Solution
Strings String Validators Problem Easy 10 Solution
Strings Text Alignment Problem Easy 10 Solution
Strings Text Wrap Problem Easy 10 Solution
Strings Designer Door Mat Problem Easy 10 Solution
Strings String Formatting Problem Easy 10 Solution
Strings Alphabet Rangoli Problem Easy 20 Solution
Strings Capitalize! Problem Easy 20 Solution
Strings The Minion Game Problem Medium 40 Solution
Strings Merge the Tools! Problem Medium 40 Solution
Sets Introduction to Sets Problem Easy 10 Solution
Sets No Idea! Problem Medium 50 Solution
Sets Symmetric Difference Problem Easy 10 Solution
Sets Set add() Problem Easy 10 Solution
Sets Set discard() remove() pop() Problem Easy 10 Solution
Sets Set union() Operation Problem Easy 10 Solution
Sets Set intersection() Operation Problem Easy 10 Solution
Sets Set difference() Operation Problem Easy 10 Solution
Sets Set symmetric_difference() Operation Problem Easy 10 Solution
Sets Set Mutations Problem Easy 10 Solution
Sets The Captain's Room Problem Easy 10 Solution
Sets Check Subset Problem Easy 10 Solution
Sets Check Strict Superset Problem Easy 10 Solution
Math Polar Coordinates Problem Easy 10 Solution
Math Find Angle MBC Problem Medium 10 Solution
Math Triangle Quest 2 Problem Medium 20 Solution
Math Mod Divmod Problem Easy 10 Solution
Math Power - Mod Power Problem Easy 10 Solution
Math Integers Come In All Sizes Problem Easy 10 Solution
Math Triangle Quest Problem Medium 20 Solution
Itertools itertools.product() Problem Easy 10 Solution
Itertools itertools.permutations() Problem Easy 10 Solution
Itertools itertools.combinations() Problem Easy 10 Solution
Itertools itertools.combinations_with_replacement() Problem Easy 10 Solution
Itertools Compress the String! Problem Medium 20 Solution
Itertools Iterables and Iterators Problem Medium 40 Solution
Itertools Maximize It! Problem Hard 50 Solution
Collections collections.Counter() Problem Easy 10 Solution
Collections defaultdict Tutorial Problem Easy 20 Solution
Collections collections.namedtuple() Problem Easy 20 Solution
Collections collections.OrderedDict() Problem Easy 20 Solution
Collections collections.deque() Problem Easy 20 Solution
Collections Company Logo Problem Medium 40 Solution
Collections Word Order Problem Medium 50 Solution
Collections Piling Up! Problem Medium 50 Solution
Date and Time Calendar Module Problem Easy 10 Solution
Date and Time Time Delta Problem Medium 30 Solution
Errors and Exceptions Exceptions Problem Easy 10 Solution
Errors and Exceptions Incorrect Regex Problem Easy 20 Solution
Classes Classes - Dealing with Complex Numbers Problem Medium 20 Solution
Classes Class 2 - Find the Torsional Angle Problem Easy 20 Solution

Regex

Subdomain Challenge Problem Difficulty Score Solution
Introduction Matching Specific String Problem Easy 5 Solution
Introduction Matching Anything But a Newline Problem Easy 5 Solution
Introduction Matching Digits & Non-Digit Characters Problem Easy 5 Solution
Introduction Matching Whitespace & Non-Whitespace Character Problem Easy 5 Solution
Introduction Matching Word & Non-Word Character Problem Easy 5 Solution
Introduction Matching Start & End Problem Easy 5 Solution
Character Class Matching Specific Characters Problem Easy 10 Solution
Character Class Excluding Specific Characters Problem Easy 10 Solution
Character Class Matching Character Ranges Problem Easy 10 Solution
Repetitions Matching {x} Repetitions Problem Easy 20 Solution
Repetitions Matching {x, y} Repetitions Problem Easy 20 Solution
Repetitions Matching Zero Or More Repetitions Problem Easy 20 Solution
Repetitions Matching One Or More Repetitions Problem Easy 20 Solution
Repetitions Matching Ending Items Problem Easy 20 Solution
Grouping and Capturing Matching Word Boundaries Problem Easy 20 Solution
Grouping and Capturing Capturing & Non-Capturing Groups Problem Easy 20 Solution
Grouping and Capturing Alternative Matching Problem Easy 20 Solution
Backreferences Matching Same Text Again & Again Problem Easy 20 Solution
Backreferences Backreferences To Failed Groups Problem Easy 20 Solution
Backreferences Branch Reset Groups Problem Easy 20 Solution
Backreferences Forward References Problem Easy 20 Solution
Assertions Positive Lookahead Problem Easy 20 Solution
Assertions Negative Lookahead Problem Easy 20 Solution
Assertions Positive Lookbehind Problem Easy 20 Solution
Assertions Negative Lookbehind Problem Easy 20 Solution

Security

Subdomain Challenge Problem Difficulty Score Solution
Functions Security Functions Problem Easy 5 Solution
Functions Security Functions II Problem Easy 5 Solution
Functions Security Bijective Functions Problem Easy 10 Solution
Functions Security Function Inverses Problem Easy 10 Solution
Functions Security Permutations Problem Easy 10 Solution
Functions Security Involution Problem Easy 10 Solution
Terminology and Concepts Security - Message Space and Ciphertext Space Problem Easy 10 Solution
Terminology and Concepts Security Key Spaces Problem Easy 10 Solution
Terminology and Concepts Security Encryption Scheme Problem Easy 10 Solution
Cryptography PRNG Sequence Guessing Problem Medium 50 Solution
Cryptography Keyword Transposition Cipher Problem Easy 50 Solution
Cryptography Basic Cryptanalysis Problem Hard 50 Solution

SQL

Subdomain Challenge Problem Difficulty Score Solution
Basic Select Reversing the Select Query I Problem Easy 10 Solution
Basic Select Revising the Select Query II Problem Easy 10 Solution
Basic Select Select All Problem Easy 10 Solution
Basic Select Select By ID Problem Easy 10 Solution
Basic Select Japanese Cities' Attributes Problem Easy 10 Solution
Basic Select Japanese Cities' Names Problem Easy 10 Solution
Basic Select Weather Observation Station 1 Problem Easy 15 Solution
Basic Select Weather Observation Station 3 Problem Easy 10 Solution
Basic Select Weather Observation Station 4 Problem Easy 10 Solution
Basic Select Weather Observation Station 5 Problem Easy 30 Solution
Basic Select Weather Observation Station 6 Problem Easy 10 Solution
Basic Select Weather Observation Station 7 Problem Easy 10 Solution
Basic Select Weather Observation Station 8 Problem Easy 15 Solution
Basic Select Weather Observation Station 9 Problem Easy 10 Solution
Basic Select Weather Observation Station 10 Problem Easy 10 Solution
Basic Select Weather Observation Station 11 Problem Easy 15 Solution
Basic Select Weather Observation Station 12 Problem Easy 15 Solution
Basic Select Higher Than 75 Marks Problem Easy 15 Solution
Basic Select Employee Names Problem Easy 10 Solution
Basic Select Employee Salaries Problem Easy 10 Solution
Advanced Select Type of Triangle Problem Easy 20 Solution
Advanced Select The PADS Problem Medium 30 Solution
Advanced Select Occupations Problem Medium 30 Solution
Advanced Select Binary Tree Nodes Problem Medium 30 Solution
Advanced Select New Companies Problem Medium 30 Solution
Aggregation Revising Aggregations - The Count Function Problem Easy 10 Solution
Aggregation Revising Aggregations - The Sum Function Problem Easy 10 Solution
Aggregation Revising Aggregations - Averages Problem Easy 10 Solution
Aggregation Average Population Problem Easy 10 Solution
Aggregation Japan Population Problem Easy 10 Solution
Aggregation Population Density Difference Problem Easy 10 Solution
Aggregation The Blunder Problem Easy 15 Solution
Aggregation Top Earners Problem Easy 20 Solution
Aggregation Weather Observation Station 2 Problem Easy 15 Solution
Aggregation Weather Observation Station 13 Problem Easy 10 Solution
Aggregation Weather Observation Station 14 Problem Easy 10 Solution
Aggregation Weather Observation Station 15 Problem Easy 15 Solution
Aggregation Weather Observation Station 16 Problem Easy 10 Solution
Aggregation Weather Observation Station 17 Problem Easy 15 Solution
Aggregation Weather Observation Station 18 Problem Medium 25 Solution
Aggregation Weather Observation Station 19 Problem Medium 30 Solution
Aggregation Weather Observation Station 20 Problem Medium 40 Solution

Tutorials Completed

10 Days of JavaScript

Day Challenge Problem Difficulty Score Solution
0 Hello, World! Problem Easy 10 Solution
0 Data Types Problem Easy 10 Solution
1 Arithmetic Operators Problem Easy 10 Solution
1 Functions Problem Easy 10 Solution
1 Let and Const Problem Easy 10 Solution
2 Conditional Statements - If-Else Problem Easy 10 Solution
2 Conditional Statements - Switch Problem Easy 10 Solution
2 Loops Problem Easy 10 Solution
3 Arrays Problem Easy 15 Solution
3 Try, Catch, and Finally Problem Easy 15 Solution
3 Throw Problem Easy 15 Solution
4 Create a Rectangle Object Problem Easy 15 Solution
4 Count Objects Problem Easy 15 Solution
4 Classes Problem Easy 15 Solution
5 Inheritance Problem Easy 15 Solution
5 Template Literals Problem Easy 15 Solution
5 Arrow Functions Problem Easy 15 Solution
6 Bitwise Operators Problem Easy 15 Solution
6 JavaScript Dates Problem Easy 15 Solution
7 Regular Expressions I Problem Easy 15 Solution
7 Regular Expressions II Problem Easy 15 Solution
7 Regular Expressions III Problem Easy 15 Solution
8 Create a Button Problem Easy 20 Solution
8 Buttons Container Problem Easy 25 Solution
9 Binary Calculator Problem Medium 30 Solution

10 Days of Statistics

Day Challenge Problem Difficulty Score Solution
0 Mean, Median, and Mode Problem Easy 30 Solution
0 Weighted Mean Problem Easy 30 Solution
1 Quartiles Problem Easy 30 Solution
1 Interquartile Range Problem Easy 30 Solution
1 Standard Deviation Problem Easy 30 Solution
2 Basic Probability Problem Easy 10 Solution
2 More Dice Problem Easy 10 Solution
2 Compound Event Probability Problem Easy 10 Solution
3 Conditional Probability Problem Easy 10 Solution
3 Cards of the Same Suit Problem Easy 10 Solution
3 Drawing Marbles Problem Easy 10 Solution
4 Binomial Distribution I Problem Easy 30 Solution
4 Binomial Distribution II Problem Easy 30 Solution
4 Geometric Distribution I Problem Easy 30 Solution
4 Geometric Distribution II Problem Easy 30 Solution
5 Poisson Distribution I Problem Easy 30 Solution
5 Poisson Distribution II Problem Easy 30 Solution
5 Normal Distribution I Problem Easy 30 Solution
5 Normal Distribution II Problem Easy 30 Solution
6 The Central Limit Theorem I Problem Easy 30 Solution
6 The Central Limit Theorem II Problem Easy 30 Solution
6 The Central Limit Theorem III Problem Easy 30 Solution
7 Pearson Correlation Coefficient I Problem Easy 30 Solution
7 Spearman's Rank Correlation Coefficient Problem Easy 30 Solution
8 Least Square Regression Line Problem Easy 30 Solution
8 Pearson Correlation Coefficient II Problem Easy 30 Solution
9 Multiple Linear Regression Problem Medium 30 Solution

30 Days of Code

Day Challenge Problem Difficulty Score Python C#
0 Hello, World Problem Easy 30 Solution Solution
1 Data Types Problem Easy 30 Solution Solution
2 Operators Problem Easy 30 Solution Solution
3 Intro to Conditional Statements Problem Easy 30 Solution Solution
4 Class vs. Instance Problem Easy 30 Solution Solution
5 Loops Problem Easy 30 Solution Solution
6 Let's Review Problem Easy 30 Solution Solution
7 Arrays Problem Easy 30 Solution Solution
8 Dictionaries and Maps Problem Easy 30 Solution Solution
9 Recursion 3 Problem Easy 30 Solution Solution
10 Binary Numbers Problem Easy 30 Solution Solution
11 2D Arrays Problem Easy 30 Solution Solution
12 Inheritance Problem Easy 30 Solution Solution
13 Abstract Classes Problem Easy 30 Solution Solution
14 Scope Problem Easy 30 Solution Solution
15 Linked List Problem Easy 30 Solution Solution
16 Exceptions - String to Integer Problem Easy 30 Solution Solution
17 More Exceptions Problem Easy 30 Solution Solution
18 Queues and Stack Problem Easy 30 Solution Solution
19 Interfaces Problem Easy 30 Solution Solution
20 Sorting Problem Easy 30 Solution Solution
21 Generics Problem Easy 30 Solution Solution
22 Binary Search Trees Problem Easy 30 Solution Solution
23 BST Level-Order Traversal Problem Easy 30 Solution Solution
24 More Linked Lists Problem Easy 30 Solution Solution
25 Running Time and Complexity Problem Medium 30 Solution Solution
26 Nested Logic Problem Easy 30 Solution Solution
27 Testing Problem Easy 30 Solution Solution
28 RegEx, Patterns, and Intro to Databases Problem Medium 30 Solution Solution
29 Bitwise AND Problem Medium 30 Solution Solution

Interview Preparation Kit

Domain Challenge Problem Difficulty Score Solution
Warm-up Challenges Sock Merchant Problem Easy 10 Solution
Warm-up Challenges Counting Valleys Problem Easy 15 Solution
Warm-up Challenges Jumping on the Clouds Problem Easy 20 Solution
Warm-up Challenges Repeated String Problem Easy 20 Solution
Arrays 2D Arrays - DS Problem Easy 15 Solution
Arrays Arrays - Left Rotation Problem Easy 20 Solution
Arrays New Year Chaos Problem Medium 40 Solution
Arrays Minimum Swaps 2 Problem Medium 40 Solution
Arrays Array Manipulation Problem Hard 60 Solution
Dictionaries and Hashmaps Hash Tables - Ransom Note Problem Easy 25 Solution
Dictionaries and Hashmaps Two Strings Problem Easy 25 Solution
Dictionaries and Hashmaps Sherlock and Anagrams Problem Medium 50 Solution
Dictionaries and Hashmaps Count Triplets Problem Medium 35 Solution
Dictionaries and Hashmaps Frequency Queries Problem Medium 40 Solution
Sorting Sorting - Bubble Sort Problem Easy 30 Solution
Sorting Mark and Toys Problem Easy 35 Solution
Sorting Sorting - Comparator Problem Medium 35 Solution
Sorting Fraudulent Activity Notifications Problem Medium 40 Solution
Sorting Merge Sort - Counting Inversions Problem Hard 45 Solution
String Manipulation Strings - Making Anagrams Problem Easy 25 Solution
String Manipulation Alternating Characters Problem Easy 20 Solution
String Manipulation Sherlock and the Valid String Problem Medium 35 Solution
String Manipulation Special String Again Problem Medium 40 Solution
String Manipulation Common Child Problem Hard 60 Solution
Greedy Algorithm Minimum Absolute Difference in an Array Problem Easy 15 Solution
Greedy Algorithm Luck Balance Problem Easy 20 Solution
Greedy Algorithm Greedy Florist Problem Medium 35 Solution
Greedy Algorithm Max Min Problem Medium 35 Solution
Greedy Algorithm Reverse Shuffle Merge Problem Advanced 50 Solution

Certificates

Skill Test Difficulty Certificate
Python Test Basic Certificate
Java Test Basic Certificate
JavaScript Test Basic Certificate
React Test Basic Certificate
Problem Solving Test Basic Certificate

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