30 Days of Code

30 days of code HackerRank solutions. Here is the list of all HackerRank website programming problems list from day-0 to day-29 HackerRank problems. This is a challenging challenge given by the HackerRank website.

We have to solve programming problems in any language but we are going to provide a solution in C, C++, and Java. You can practice a problem day by day.


So firstly we have to know about the HackerRank, So firstly we have to know a little bit about the HackerRank coding platform website.

About HackerRank

HackerRank is a technology hiring platform that is the standard for assessing developer skills for over 1,000 companies around the world.

By enabling tech recruiters and hiring managers to evaluate talent at every stage of the recruiting process objectively, HackerRank helps companies hire skilled developers and innovate faster.

Hackerrank 30 Days of Challenge

30 Days of Code Solutions is a challenge for programmers by Website, we have to solve daily one programming problem for up to 30-days, in any programming language, The website supports multiple languages, for example, C, C++, C#, F#, Go, Java, Python, Ruby, Swift & TypeScript.

I will solve these problems in C, C++, and Java. You have to practice a problem day by day.

You can find a solution for other domain and sub-domain solutions ie Introduction, Strings, Classes, STL(Standard Template Library), Inheritance, Other Concepts, Algorithms, Miscellaneous, and Data Structure.

That’s not enough, Yes we are not yet done because we have a list of other competitive programming websites also ie. HackerEarth, and Geeksforgeeks solutions for various domains like School, Basic, Easy, Medium, and Hard.

I am 100% sure that you can enjoy and practice huge problems in various categories and different- different languages such as C, and C++. And java.

Our Aim

We aim to provide logic, and explanation, with examples so you can enhance and improve your coding skills.

That is the reason we explained the programming solution step by step in all 3 major languages(C, C++, and java).

In future, we are also planning to solve these problems in python also.

Advice: Do not just copy and paste the solution in the HackerRank code editor, First learn and understand the answer.

If you feel any difficulty comment below or contact us we will clear your doubt.

30 Days Challenge List

Day 0: Hello, World Hackerrank Solutions

Day 1: Data Types Hackerrank Solutions

Day 2: Operators Hackerrank Solutions

Day 3: Intro to Conditional Statements

Day 4: Class vs. Instance Hackerrank Solutions

Day 5: Loops Hackerrank Solutions

Day 6: Let’s Review Hackerrank Solutions

Day 7: Arrays Hackerrank Solutions

Day 8: Dictionaries and Maps Hackerrank Solutions

Day 9: Recursion

Day 10: Binary Numbers

Day 11: 2D Arrays

Day 12: Inheritance

Day 13: Abstract Classes

Day 14: Scope

Day 15: Linked List

Day 16: Exceptions – String to Integer

Day 17: More Exceptions

Day 18: Queues and Stacks

Day 19: Interfaces

Day 20: Sorting

Day 21: Generics

Day 22: Binary Search Trees

Day 23: BST Level-Order Traversal

Day 24: More Linked Lists

Day 25: Running Time and Complexity

Day 26: Nested Logic

Day 27: Testing

Day 28: RegEx, Patterns, and Intro to Databases

Day 29: Bitwise AND

Related to HackerRank



  • Warmup
  • Implementation
  • Strings
  • Sorting
  • Search
  • Graph Theory
  • Greedy
  • Dynamic Programming
  • Constructive Algorithms
  • Bit Manipulation
  • Recursion
  • Game Theory
  • NP-Complete
  • Debugging

Data Structure

  • Arrays
  • Linked Lists
  • Trees
  • Balanced Trees
  • Stacks
  • Queues
  • Heap
  • Disjoint Set
  • Multiple Choice
  • Trie
  • Advanced