marinskiy/HackerrankPractice

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170+ solutions to Hackerrank.com practice problems using Python 3, С++ and Oracle SQL

1,109 stars 431 forks

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README.md

Original

Solutions to Hackerrank practice problems

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

Updated daily :) If it was helpful please press a star.

Algorithms
1. 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
2. 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
3. Sorting
  - Intro to Tutorial Challenges | Problem | Solution | Score: 30
  - Big Sorting | Problem | Solution | Score: 20
4. Search
  - Pairs | Problem | Solution | Score: 50
5. 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
6. 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
1. Statistics and Machine Learning Statistics and Machine Learning
  - Laptop Battery Life | Problem | Solution | Score: 10
C++
1. Introduction
  - Say Hello, World! With Cpp | Problem | Solution | Score: 10
Data Structures
1. Arrays
  - Arrays - DS | Problem | Solution | Score: 10
Interview Preparation Kit - CPP
1. 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
2. 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
1. 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
2. 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
3. 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
4. Sorting
  - Sorting - Bubble Sort | Problem | Solution | Score: 30
  - Mark and Toys | Problem | Solution | Score: 35
5. Search
  - Hash Tables - Ice Cream Parlor | Problem | Solution | Score: 35
  - Minimum Time Required | Problem | Solution | Score: 35
  - Triple sum | Problem | Solution | Score: 40
6. Dynamic Programming
  - Max Array Sum | Problem | Solution | Score: 20
Python
1. 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
2. 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
3. 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
4. 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
5. 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
6. 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
7. Date and Time
  - Calendar Module | Problem | Solution | Score: 10
  - Time Delta | Problem | Solution | Score: 30
8. Errors and Exceptions
  - Exceptions | Problem | Solution | Score: 10
  - Incorrect Regex | Problem | Solution | Score: 20
9. Numpy
  - Arrays | Problem | Solution | Score: 10
  - Shape and Reshape | Problem | Solution | Score: 20
SQL
1. 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
2. Advanced Select
  - Type of Triangle | Problem | Solution | Score: 20
  - The PADS | Problem | Solution | Score: 30
  - Binary Tree Nodes | Problem | Solution | Score: 30
3. 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
4. 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
1. 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

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