bst

romanovpv/task 1/bst.py

@@ -1,15 +1,61 @@
+def bst_create_node(name, phone):
+    return {'name': name, 'phone': phone, 'left': None, 'right': None}
+
 def bst_insert(root, name, phone):
-    {'name': name, 'phone': phone, 'left': None, 'right': None}
-    pass
+    if root is None:
+        return bst_create_node(name, phone)
+    
+    if name == root['name']:
+        root['phone'] = phone
+    elif name < root['name']:
+        root['left'] = bst_insert(root['left'], name, phone)
+    else:
+        root['right'] = bst_insert(root['right'], name, phone)
+    return root
 
 def bst_find(root, name):
-    pass
+    if root is None:
+        return None
+    if root['name'] == name:
+        return root['phone']
+    if name < root['name']:
+        return bst_find(root['left'], name)
+    return bst_find(root['right'], name)
+
+def _bst_min_value_node(node):
+    current = node
+    while current['left'] is not None:
+        current = current['left']
+    return current
 
 def bst_delete(root, name):
-    pass
+    if root is None:
+        return None
 
-def bst_delete(root, name):
-    pass
+    if name < root['name']:
+        root['left'] = bst_delete(root['left'], name)
+    elif name > root['name']:
+        root['right'] = bst_delete(root['right'], name)
+    else:
+    
+        if root['left'] is None:
+            return root['right']
+        elif root['right'] is None:
+            return root['left']
+        
+        temp = _bst_min_value_node(root['right'])
+        root['name'] = temp['name']
+        root['phone'] = temp['phone']
+        root['right'] = bst_delete(root['right'], temp['name'])
+        
+    return root
 
 def bst_list_all(root):
-    pass
+    def inorder(node, acc):
+        if node:
+            inorder(node['left'], acc)
+            acc.append((node['name'], node['phone']))
+            inorder(node['right'], acc)
+        return acc
+    
+    return inorder(root, [])