To decide which data structure you need in what case, you should know about them in the first place.

You need to know:
-> Which exist
-> What they are good for
-> How they work
-> Their runtime characteristics (time and space complexity)
-> Their pros
-> And cons

->Fork the repo, make a new branch with your name.

-> Please select the folder in which you have a solution for or create the folder in which you want to contribute.

-> In case the solution already exist for the problem, make another file for it marking the number of the solution.

-> Please put a block comment of the question in your solution.

-> Please refrain from adding plagiarised code. In case you are using someone's code please add credit or reference.

->At the end don't forget to give a star to repo.