Fixed SBBT traversal

Author: Kishan-Ved

pydatastructs/miscellaneous_data_structures/_backend/cpp/stack/ArrayStack.hpp

@@ -4,7 +4,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include <cstdlib>
-#include <iostream>
 #include <structmember.h>
 #include "../../../../linear_data_structures/_backend/cpp/arrays/DynamicOneDimensionalArray.hpp"
 

pydatastructs/trees/_backend/cpp/BinaryTreeTraversal.hpp

@@ -36,12 +36,12 @@ static PyObject* BinaryTreeTraversal___new__(PyTypeObject* type, PyObject *args,
     if (PyType_Ready(&SelfBalancingBinaryTreeType) < 0) { // This has to be present to finalize a type object. This should be called on all type objects to finish their initialization.
         return NULL;
     }
-    if (PyObject_IsInstance(tree, (PyObject *)&BinarySearchTreeType)) {
-        self->tree = reinterpret_cast<BinarySearchTree*>(tree)->binary_tree;
-    }
-    else if (PyObject_IsInstance(tree, (PyObject *)&SelfBalancingBinaryTreeType)) {
+    if (PyObject_IsInstance(tree, (PyObject *)&SelfBalancingBinaryTreeType)) {
         self->tree = reinterpret_cast<SelfBalancingBinaryTree*>(tree)->bst->binary_tree;
     }
+    else if (PyObject_IsInstance(tree, (PyObject *)&BinarySearchTreeType)) {
+        self->tree = reinterpret_cast<BinarySearchTree*>(tree)->binary_tree;
+    }
     else {
         PyErr_SetString(PyExc_ValueError, "Not a supported type for BinaryTreeTraversal.");
         return NULL;

pydatastructs/trees/tests/test_binary_trees.py

@@ -456,13 +456,13 @@ def test_SelfBalancingBinaryTree():
     assert tree.tree[2].right != 3
     assert tree.tree[tree.tree[5].parent].right == 5
 
-    # trav = BinaryTreeTraversal(tree, backend=Backend.CPP)
-    # in_order = trav.depth_first_search(order='in_order')
-    # pre_order = trav.depth_first_search(order='pre_order')
-    # assert [node.key for node in in_order] == [4.4, 4.5, 4.55, 4.6, 4.65, 5, 5.5]
-    # assert [node.key for node in pre_order] == [5, 4.5, 4.4, 4.55, 4.6, 4.65, 5.5]
+    trav = BinaryTreeTraversal(tree, backend=Backend.CPP)
+    in_order = trav.depth_first_search(order='in_order')
+    pre_order = trav.depth_first_search(order='pre_order')
+    assert [node.key for node in in_order] == [4.4, 4.5, 4.55, 4.6, 4.65, 5, 5.5]
+    assert [node.key for node in pre_order] == [5, 4.5, 4.4, 4.55, 4.6, 4.65, 5.5]
 
-    # assert tree.tree[tree.tree[3].parent].right == 3
+    assert tree.tree[tree.tree[3].parent].right == 3
     # tree._left_rotate(5, 3)
     # assert str(tree) == original_tree
     # tree.insert(4.54, 4.54)