fix: median_search bug

[Kia-G]

Description of Change: Fixed sorting into subsets in main() and branching conditions in comp(). Changed rand_r() to rand(). Fixed typos and whitespace errors.

Checklist

• Added description of change
• Added tests and example, test must pass
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

Notes: The list will not print in ascending order because it is not necessary to sort the entire list.

[Panquesito7]

Suggested change

	#include<cstdlib>
	#include <cstdlib>

[kvedala]

@Kia-G There seem to be conflicts in the files. Some of your suggested changes were incorporated as part of #805 that was recently merged.

please rebase your commits on the master branch. When you do, you will get a message that there is a conflicting file that you'd have to resolve and commit.
Or, if you prefer, you can fork the new master, make the changes and create a new pull-request.

Thank you

[github-actions]

Please ping one of the maintainers once you commit the changes requested or make improvements on the code. If this is not the case and you need some help, feel free to ask for help in our Gitter channel. Thank you for your contributions!