fix: Union of two arrays (#1797)

* Create reverse_binary_tree.cpp

* Added documentation

Added Documentation for the level_order_traversal() function, and implemented a print() function to display the tree to STDOUT

* Added documentation

* Renamed tests to test

* Fixed issue with incorrect using statement

* updating DIRECTORY.md

* clang-format and clang-tidy fixes for fb86292

* Added Test cases

* Update operations_on_datastructures/reverse_binary_tree.cpp

Co-authored-by: David Leal <[email protected]>

* Update operations_on_datastructures/reverse_binary_tree.cpp

Co-authored-by: David Leal <[email protected]>

* Update operations_on_datastructures/reverse_binary_tree.cpp

Co-authored-by: David Leal <[email protected]>

* Update operations_on_datastructures/reverse_binary_tree.cpp

Co-authored-by: David Leal <[email protected]>

* Update operations_on_datastructures/reverse_binary_tree.cpp

Co-authored-by: David Leal <[email protected]>

* Changed int to int64_t

* Updated documentation wording

* Added reference to intersection of two arrays

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: David Leal <[email protected]>

Author: 3 people

operations_on_datastructures/union_of_two_arrays.cpp

@@ -7,6 +7,7 @@
  * in the first array, combined with all of the unique elements of a second
  * array. This implementation uses ordered arrays, and an algorithm to correctly
  * order them and return the result as a new array (vector).
+ * @see intersection_of_two_arrays.cpp
  * @author [Alvin](https://github.com/polarvoid)
  */