Code-for-HacktoberFest-2021 🎩

Hacktoberfest 2021

This repo is used for HacktoberFest-2021. Write programs in your preferred languages!

How to contribute? 🌽

• Register on Hacktoberfest 2021 with your github account so that pull requests can be tracked.
• Fork this repo and give it a star.
• Upload your solution file under specific directory (or create one directory of specific language if not there) with a comment having your Github username on the top of file.
• Commit the changes.
• Create a Pull Request.

Getting Started 🔫

There are 3 types of problems in this repo:

1. Beginner
2. Intermediate
3. Advanced

Beginner 🔰

• Even or odd
• Prime or not
• Generate a random number
• Printing numbers upto 10 using tail recursion

Intermediate: 💨

• Subsets of 'abcd'
• Second highest number in 4 3 1 5 2
• Celebrity problem
• Binary search for 3 in 2 4 8 9 1 3 6

Advanced: ⭐

• Reverse a linked list
• Make a binary search tree with 1 2 3 4 5
• Find duplicates in an array using hash map
• Prefix sum array of 1 2 3 4 5 with time complexity O(n)