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What you can find in this repository

Here you will be able to find my HackerRank solutions to many challenghes, using C++, JavaScript, Python and SQL

Correlated Materials

Visit my Competitive programming guide and see also my HackerRank, GeeksForGeeks, Leetcode and other online judges solutions

Index

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SQL

Category Name Database Solution
Aggregation -Count Revising aggregations the count MYSQL SQL
SELECT Weather Observation Station 16 MYSQL SQL
SELECT Weather Observation Station 2 MYSQL SQL
SELECT Weather Observation Station 13 MYSQL SQL
SELECT Weather Observation Station 14 MYSQL SQL
Basic select Revising-Select 1 ORACLE SQL
Basic select Revising-Select 2 ORACLE SQL
Basic select Weather observation ORACLE SQL
Basic select Weather observation-6 MySQL SQL
Basic select Weather observation-8 MySQL SQL
Basic select Weather observation-9 MySQL SQL
Basic select Weather observation-11 MySQL SQL
Aggregation Sum function ORACLE SQL
Aggregation Japanese population ORACLE SQL
Basic Join Average Continent Population MYSQL SQL
Basic Join Asian Population MYSQL SQL
Basic Join African Cities MYSQL SQL

30 Days Of Code

Name C++ Python Java
Hello World C++ PYTHON Java
Loops C++ PYTHON Java
DataTypes PYTHON
Operators C++ N/A JAVA
Array Python
LinkedList C++ Python
30-dictionaries-and-maps C++
30-dictionaries-and-maps C++

Problem Solving

Name C++ Python
Plus Minus Python
HackerRank tweets Python
Diagonal Difference C++
Time conversion C++
Insert not in double linkedln list C++
Min max sum PY
Array-DS C++ Python
Print Linked List C++ Python
Preorder Traversal Tree C++ Python
PostOrder Traversal Tree C++
Insert Node at the head of Linked List C++ Python
Print reverse of a linked list C++
Plus Minus C++ Python
Get the value of thenode at a specific position from the tail C++
Reverse Linked list C++
Compare two list C++
Detect Loop in a Linked List C++ Python
Insert node in a specific position C++
Insert at the tail of a linked list C++
Tree Inorder C++
Tree level traversal C++
Binary search insertion C++
Delete ndoe from a linked list C++
Strong passsword C++
CamelCase C++
Find the media C++
Beautiful binary string(substring search) C++
cats and a mouse C++
Level order traverse of a Binary Tree C++
30-Sorting C++
Divisible sum pair C++
Apple and orange PYTHON
FInd digits C++
Angry professor C++
Tutorial Intro C++
Bon Appetit C++
Sock Merchant C++
Circular array rotation C++
Equality in a array C++
Grading C++
Kangooro C++
Panagrams C++
Alternating characters C++
ice Cream Parlor C++
Lonely-integer C++
Cpmpare tripletes C++

| |C++||

Python

Category Name Solution
String String validation Python
Introduction Hello World Python
I/O Python-print Python
Data Structure List Python
Python Loops Loops Python
Split and join Strings Python
Swap case Python
Python mutations Python
Capitalize Python
Validating phone number Python
Find the percentage Python

| |Python||

10 Days Javascript

Day Name Solution
0 Hello world JS
1 Data types JS
1 Arithmetic Operators JS
1 Function JS
1 If-else JS
1 Let and Cost JS
2 Loops JS
2 Conditional switch JS
4 Recatangle Object (Tutorial) JS
4 Count Objects (Tutorial)
JS

C++

Name Solution
Data Types C++
Array left shift C++
Min Max sum C++
Preoder Traversal Tree C++
Struct C++
Vector Sort C++
Vector Erase C++
SET C++
Map C++
Vector-Erase 2 C++
C-tutorial pointer C++

| |C++|

Interview preparation kit

Name Solution
Detect Cycle in Linked List C++
Pairs C++
Height of a tree C++

How to contribute?

  1. Fork the repository
  2. Do the desired changes (add/delete/modify)
  3. Make a pull request

When to contribute?

  1. If there is no solution to a problem in the main branch.
  2. If your solution is asymptotically faster than the one in the main branch.
  3. If your algorithm is of the same time complexity but with reduced code size. In this case, comment out the original solution and make a pull request with your solution.
  4. If you have another method of solving the problem which is asymptotically slower than the original method then, comment your solution in the main file and make a pull request.

Mind that

Constructive criticisms or code reviews of any kind are very much welcome.

If you have any questions about the solutions you can find here, feel free to contact me at: davidepollicino2015@gmail.com

Support

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