feat: add 2-3-4-tree implment (TheAlgorithms#1366)

* feat: add 2-3-4 tree implment * updating DIRECTORY.md * docs: fix format issue of tab&space * fix: fix code format issues * fix: convert printf() to std::cout * fix: fix some clang-tidy warnings * fix: fix clang-tidy warnings of memory owning * fix: remove use of std::make_unique which is not support by c++11 * docs: improve documents * fix: replace fprint with ofstream, and improve docs * docs: improve docs for including header file * docs: improve file doces * fix: convert item type to int64_t, convert node item count type to int8_t * refactor: Apply suggestions from code review Add namespaces Co-authored-by: David Leal <[email protected]> * docs: remove obsolete comments Co-authored-by: liuhuan <[email protected]> Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: David Leal <[email protected]>
Rijul24 · Feb 11, 2021 · 4a5310c · 4a5310c
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diff --git a/DIRECTORY.md b/DIRECTORY.md
@@ -46,6 +46,7 @@
  * [Test Stack](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/test_stack.cpp)
  * [Test Stack Students](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/test_stack_students.cpp)
  * [Tree](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/tree.cpp)
+ * [Tree 234](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/tree_234.cpp)
  * [Trie Modern](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/trie_modern.cpp)
  * [Trie Tree](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/data_structures/trie_tree.cpp)