[Matrix] Max area of island problem solved DFS algorithm

[kondekarshubham123]

Describe your change:

Maximum area of island problem added.

• [X] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Documentation change?

Checklist:

• [X] I have read CONTRIBUTING.md.
• [X] This pull request is all my own work -- I have not plagiarized.
• [X] I know that pull requests will not be merged if they fail the automated tests.
• [X] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [X] All new Python files are placed inside an existing directory.
• [X] All filenames are in all lowercase characters with no spaces or dashes.
• [X] All functions and variable names follow Python naming conventions.
• [X] All function parameters and return values are annotated with Python type hints.
• [X] All functions have doctests that pass the automated testing.
• [X] All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• [X] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[kondekarshubham123]

hi @CaedenPH, I have made changes as per suggestions

please merge this PR under hackoberfest label

[CenTdemeern1]

Hey, your doctests failed... Please correct this. (Your PR will not be merged with failed tests)

[CenTdemeern1]

Also, wait, huh? Mypy is complaining, I thought we didn't use that here I have never run into this before, uh...

[CenTdemeern1]

@CaedenPH Are you sure that type specification removal was correct?

[kondekarshubham123]

Hey, your doctests failed... Please correct this. (Your PR will not be merged with failed tests)

yes, I have corrected this

[CenTdemeern1]

Caeden is not responding, just put the : set back, sorry about the confusion regarding that

[kondekarshubham123]

yes @CenTdemeern1 , I had put : set back Thanks

[kondekarshubham123]

Hi @cclauss or @dhruvmanila, Please review this PR as well

Thanks

[cclauss]

Use that max 88 characters to put comments on fewer lines. Define one matrix and use it multiple times. If you pass me the matrix, I can calculate rows and cols. Iterate thru the matrix like a Pythonista...

    for row, line in enumerate(mat):
        for col, item in enumerate(line):
            if item == 1 and (row, col) not in seen: