* feat: Binary tree node sum (#7020)
* feat: Sum of all nodes in binary tree explanation (#7020)
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* refactor: Change replace method with `__iter__` overriding (#7020)
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* Binary Search Tree Inorder Traversal
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* Binary Search Tree Inorder Traversal v2
* Binary Search Tree Inorder Traversal
* Binary Search Tree Inorder Traversal
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* Update data_structures/binary_tree/inorder_tree_traversal_2022.py
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* Updated
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* Updated and removed print statement
removed the print from inorder function
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* Add Catalan number to maths
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* renames prime functions and occurances in comments
* changes implementation of primality testing to be uniform
* adds static typing as per conventions
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* Get rid of the Union
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* Get rid of the Union
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* Added average absolute deviation
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* The black formatter is no longer beta
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* Remove project_euler/problem_145 which is killing our CI tests
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* Fix type annotations for linked_stack.py
* Replace Optional with inline union type
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* Rename stack_using_dll to stack_with_doubly_linked_list
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* [mypy] Fix type annotation in euler_method.py
In line with issue #4052.
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* New solution for Euler problem 67
A faster and memory efficient solution based on the template of sol1.py.
Modified the solution to be more memory efficient while reading and generating the array
and during the solution finding.
No conditions and straightforward logic.
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Preferring comprehensions over map
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* Fixed extra line
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* Financial: principle -> principal
The originally invested amount of money: `principal`
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* Fix validate_initial_digits of credit_card_validator.py
@Bhargavishnu I think that I broke the logic of validate_initial_digits which should require that credit_card_number[0] is 3 before checking that credit_card_number[1] is 4, 5, or 7. Please verify the new changes and the new test cases to make sure that this is correct. Thanks!
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* fix: fix mypy errors
Update binary_search_tree `arr` argument to be typed as a list
within `find_kth_smallest` function
Update return type of `merge_two_binary_trees` as both inputs can
be None which means that a None type value can be returned from
this function
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