Solutions to Hackerrank practice problems

This repository contains 185 solutions to Hackerrank practice problems with Python 3 and Oracle SQL.

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• Algorithms 01. Warmup - Solve Me First | Problem | Solution | Score: 1 - Simple Array Sum | Problem | Solution | Score: 10 - Compare the Triplets | Problem | Solution | Score: 10 - A Very Big Sum | Problem | Solution | Score: 10 - Diagonal Difference | Problem | Solution | Score: 10 - Plus Minus | Problem | Solution | Score: 10 - Staircase | Problem | Solution | Score: 10 - Mini-Max Sum | Problem | Solution | Score: 10 - Birthday Cake Candles | Problem | Solution | Score: 10 - Time Conversion | Problem | Solution | Score: 15 02. Implementation - Grading Students | Problem | Solution | Score: 10 - Apple and Orange | Problem | Solution | Score: 10 - Kangaroo | Problem | Solution | Score: 10 - Between Two Sets | Problem | Solution | Score: 10 - Breaking the Records | Problem | Solution | Score: 10 - Birthday Chocolate | Problem | Solution | Score: 10 - Electronics Shop | Problem | Solution | Score: 15 - Cats and a Mouse | Problem | Solution | Score: 15 - Forming a Magic Square | Problem | Solution | Score: 20 - Picking Numbers | Problem | Solution | Score: 20 - Climbing the Leaderboard | Problem | Solution | Score: 20 - The Hurdle Race | Problem | Solution | Score: 15 04. Sorting - Intro to Tutorial Challenges | Problem | Solution | Score: 30 - Big Sorting | Problem | Solution | Score: 20 05. Search - Pairs | Problem | Solution | Score: 50 07. Greedy - Minimum Absolute Difference in an Array | Problem | Solution | Score: 15 - Marc's Cakewalk | Problem | Solution | Score: 15 - Permuting Two Arrays | Problem | Solution | Score: 40 08. Dynamic Programming - The Coin Change Problem | Problem | Solution | Score: 60 - Equal | Problem | Solution | Score: 30 - Sherlock and Cost | Problem | Solution | Score: 50 - Construct the Array | Problem | Solution | Score: 35 - Fibonacci Modified | Problem | Solution | Score: 45
• Artificial Intelligence 01. Statistics and Machine Learning Statistics and Machine Learning - Laptop Battery Life | Problem | Solution | Score: 10
• C++ 01. Introduction - Say Hello, World! With Cpp | Problem | Solution | Score: 10
• Data Structures 01. Arrays - Arrays - DS | Problem | Solution | Score: 10
• Interview Preparation Kit - CPP 01. Warm-up Challenges - Sock Merchant | Problem | Solution | Score: 10 - Counting Valleys | Problem | Solution | Score: 15 - Jumping on the Clouds | Problem | Solution | Score: 20 - Repeated String | Problem | Solution | Score: 20 02. Arrays - 2D Array - DS | Problem | Solution | Score: 15 - Arrays - Left Rotation | Problem | Solution | Score: 20 - New Year Chaos | Problem | Solution | Score: 40
• Interview Preparation Kit - Python 01. Warm-up Challenges - Sock Merchant | Problem | Solution | Score: 10 - Counting Valleys | Problem | Solution | Score: 15 - Jumping on the Clouds | Problem | Solution | Score: 20 - Repeated String | Problem | Solution | Score: 20 02. Arrays - Arrays - Left Rotation | Problem | Solution | Score: 20 - 2D Array - DS | Problem | Solution | Score: 15 - New Year Chaos | Problem | Solution | Score: 40 - Minimum Swaps 2 | Problem | Solution | Score: 40 - Array Manipulation | Problem | Solution | Score: 60 03. Dictionaries and Hashmaps - Hash Tables - Ransom Note | Problem | Solution | Score: 25 - Two Strings | Problem | Solution | Score: 25 - Count Triplets | Problem | Solution | Score: 25 - Frequency Queries | Problem | Solution | Score: 40 - Sherlock and Anagrams | Problem | Solution | Score: 50 04. Sorting - Sorting - Bubble Sort | Problem | Solution | Score: 30 - Mark and Toys | Problem | Solution | Score: 35 07. Search - Hash Tables - Ice Cream Parlor | Problem | Solution | Score: 35 - Minimum Time Required | Problem | Solution | Score: 35 - Triple sum | Problem | Solution | Score: 40 08. Dynamic Programming - Max Array Sum | Problem | Solution | Score: 20
• Python 01. Introduction - Say Hello, World! With Python | Problem | Solution | Score: 5 - Python If-Else | Problem | Solution | Score: 10 - Arithmetic Operators | Problem | Solution | Score: 10 - Python Division | Problem | Solution | Score: 10 - Loops | Problem | Solution | Score: 10 - Write a function | Problem | Solution | Score: 10 - Print Function | Problem | Solution | Score: 20 02. Basic Data Types - List Comprehensions | Problem | Solution | Score: 10 - Find the Runner-Up Score! | Problem | Solution | Score: 10 - Nested Lists | Problem | Solution | Score: 10 - Finding the percentage | Problem | Solution | Score: 10 - Lists | Problem | Solution | Score: 10 - Tuples | Problem | Solution | Score: 10 03. Strings - sWAP cASE | Problem | Solution | Score: 10 - String Split and Join | Problem | Solution | Score: 10 - What's Your Name | Problem | Solution | Score: 10 - Mutations | Problem | Solution | Score: 10 - Find a string | Problem | Solution | Score: 10 - String Validators | Problem | Solution | Score: 10 - Text Alignment | Problem | Solution | Score: 10 - Text Wrap | Problem | Solution | Score: 10 - Designer Door Mat | Problem | Solution | Score: 10 - String Formatting | Problem | Solution | Score: 10 - Capitalize! | Problem | Solution | Score: 20 04. Sets - Introduction to Sets | Problem | Solution | Score: 10 - No Idea! | Problem | Solution | Score: 50 - Symmetric Difference | Problem | Solution | Score: 10 - Set add() | Problem | Solution | Score: 10 - Set discard() remove() pop() | Problem | Solution | Score: 10 - Set union() Operation | Problem | Solution | Score: 10 - Set intersection() Operation | Problem | Solution | Score: 10 - Set difference() Operation | Problem | Solution | Score: 10 - Set symmetric_difference() Operation | Problem | Solution | Score: 10 - Set Mutations | Problem | Solution | Score: 10 - The Captain's Room | Problem | Solution | Score: 10 - Check Subset | Problem | Solution | Score: 10 - Check Strict Superset | Problem | Solution | Score: 10 06. Itertools - itertoolsproduct() | Problem | Solution | Score: 10 - itertoolscombinations() | Problem | Solution | Score: 10 - itertoolspermutations() | Problem | Solution | Score: 10 - itertoolscombinations_with_replacement() | Problem | Solution | Score: 10 - Compress the String! | Problem | Solution | Score: 20 - Iterables and Iterators | Problem | Solution | Score: 40 - Maximize It! | Problem | Solution | Score: 50 07. Collections - collectionsCounter() | Problem | Solution | Score: 10 - DefaultDict Tutorial | Problem | Solution | Score: 20 - Collections namedtuple() | Problem | Solution | Score: 20 - Collections OrderedDict() | Problem | Solution | Score: 20 - Word Order | Problem | Solution | Score: 50 - Collections deque() | Problem | Solution | Score: 20 - Company Logo | Problem | Solution | Score: 30 - Piling Up! | Problem | Solution | Score: 50 08. Date and Time - Calendar Module | Problem | Solution | Score: 10 - Time Delta | Problem | Solution | Score: 30 09. Errors and Exceptions - Exceptions | Problem | Solution | Score: 10 - Incorrect Regex | Problem | Solution | Score: 20 16. Numpy - Arrays | Problem | Solution | Score: 10 - Shape and Reshape | Problem | Solution | Score: 20
• SQL 01. Basic Select - Revising the Select Query I | Problem | Solution | Score: 10 - Revising the Select Query II | Problem | Solution | Score: 10 - Select All | Problem | Solution | Score: 10 - Select By ID | Problem | Solution | Score: 10 - Japanese Cities' Attributes | Problem | Solution | Score: 10 - Japanese Cities' Names | Problem | Solution | Score: 10 - Weather Observation Station 1 | Problem | Solution | Score: 15 - Weather Observation Station 3 | Problem | Solution | Score: 10 - Weather Observation Station 4 | Problem | Solution | Score: 10 - Weather Observation Station 5 | Problem | Solution | Score: 30 - Weather Observation Station 6 | Problem | Solution | Score: 10 - Weather Observation Station 7 | Problem | Solution | Score: 10 - Weather Observation Station 8 | Problem | Solution | Score: 15 - Weather Observation Station 9 | Problem | Solution | Score: 10 - Weather Observation Station 10 | Problem | Solution | Score: 10 - Weather Observation Station 11 | Problem | Solution | Score: 15 - Weather Observation Station 12 | Problem | Solution | Score: 15 - Higher Than 75 Marks | Problem | Solution | Score: 15 - Employee Names | Problem | Solution | Score: 10 - Employee Salaries | Problem | Solution | Score: 10 02. Advanced Select - Type of Triangle | Problem | Solution | Score: 20 - The PADS | Problem | Solution | Score: 30 - Binary Tree Nodes | Problem | Solution | Score: 30 03. Aggregation - Revising Aggregations - The Count Function | Problem | Solution | Score: 10 - Revising Aggregations - The Sum Function | Problem | Solution | Score: 10 - Revising Aggregations - Averages | Problem | Solution | Score: 10 - Average Population | Problem | Solution | Score: 10 - Japan Population | Problem | Solution | Score: 10 - Population Density Difference | Problem | Solution | Score: 10 - The Blunder | Problem | Solution | Score: 15 - Top Earners | Problem | Solution | Score: 20 - Weather Observation Station 2 | Problem | Solution | Score: 15 - Weather Observation Station 13 | Problem | Solution | Score: 10 - Weather Observation Station 14 | Problem | Solution | Score: 10 - Weather Observation Station 15 | Problem | Solution | Score: 15 - Weather Observation Station 16 | Problem | Solution | Score: 10 - Weather Observation Station 17 | Problem | Solution | Score: 15 - Weather Observation Station 18 | Problem | Solution | Score: 25 - Weather Observation Station 19 | Problem | Solution | Score: 30 - Weather Observation Station 20 | Problem | Solution | Score: 40 04. Basic Join - Asian Population | Problem | Solution | Score: 10 - African Cities | Problem | Solution | Score: 10 - Average Population of Each Continent | Problem | Solution | Score: 10 - The Report | Problem | Solution | Score: 20
• Tutorials 01. 10 Days of Statistics - Day 0 - Mean, Median, and Mode | Problem | Solution | Score: 30 - Day 0 - Weighted Mean | Problem | Solution | Score: 30 - Day 1 - Quartiles | Problem | Solution | Score: 30 - Day 1 - Interquartile Range | Problem | Solution | Score: 30 - Day 1 - Standard Deviation | Problem | Solution | Score: 30 - Day 4 - Binomial Distribution I | Problem | Solution | Score: 30 - Day 4 - Binomial Distribution II | Problem | Solution | Score: 30 - Day 4 - Geometric Distribution I | Problem | Solution | Score: 30 - Day 4 - Geometric Distribution II | Problem | Solution | Score: 30 - Day 5 - Poisson Distribution I | Problem | Solution | Score: 30 - Day 5 - Poisson Distribution II | Problem | Solution | Score: 30 - Day 5 - Normal Distribution I | Problem | Solution | Score: 30 - Day 5 - Normal Distribution II | Problem | Solution | Score: 30 - Day 6 - The Central Limit Theorem I | Problem | Solution | Score: 30 - Day 6 - The Central Limit Theorem II | Problem | Solution | Score: 30 - Day 6 - The Central Limit Theorem III | Problem | Solution | Score: 30