70 lines
1.7 KiB
Python
70 lines
1.7 KiB
Python
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def bst_insert(root: dict | None, name: str, phone: str) -> dict:
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if root is None:
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return {'name': name, 'phone': phone, 'left': None, 'right': None}
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if name < root['name']:
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root['left'] = bst_insert(root['left'], name, phone)
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elif name > root['name']:
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root['right'] = bst_insert(root['right'], name, phone)
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else:
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root['phone'] = phone
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return root
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def bst_find(root: dict | None, name: str) -> str | None:
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current = root
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while current is not None:
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if name == current['name']:
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return current['phone']
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elif name < current['name']:
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current = current['left']
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else:
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current = current['right']
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return None
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def _min_value(node: dict) -> dict:
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while node['left'] is not None:
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node = node['left']
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return node
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def bst_delete(root: dict | None, name: str) -> dict | None:
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if root is None:
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return None
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if name < root['name']:
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root['left'] = bst_delete(root['left'], name)
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elif name > root['name']:
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root['right'] = bst_delete(root['right'], name)
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else:
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if root['left'] is None:
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return root['right']
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if root['right'] is None:
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return root['left']
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successor = _min_value(root['right'])
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root['name'] = successor['name']
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root['phone'] = successor['phone']
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root['right'] = bst_delete(root['right'], successor['name'])
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return root
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def bst_list_all(root: dict | None) -> list:
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result = []
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def walk(node: dict | None):
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if node is None:
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return
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walk(node['left'])
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result.append((node['name'], node['phone']))
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walk(node['right'])
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walk(root)
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return result
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