51 lines
1.2 KiB
Python
51 lines
1.2 KiB
Python
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def ll_list_all(start: dict | None) -> list:
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items = []
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node = start
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while node is not None:
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items.append((node['name'], node['phone']))
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node = node['next']
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items.sort(key=lambda x: x[0])
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return items
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def ll_delete(start: dict | None, key: str) -> dict | None:
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if start is None:
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return None
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if start['name'] == key:
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return start['next']
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ptr = start
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while ptr['next'] is not None:
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if ptr['next']['name'] == key:
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ptr['next'] = ptr['next']['next']
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return start
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ptr = ptr['next']
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return start
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def ll_find(start: dict | None, key: str) -> str | None:
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ptr = start
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while ptr is not None:
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if ptr['name'] == key:
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return ptr['phone']
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ptr = ptr['next']
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return None
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def ll_insert(start: dict | None, key: str, value: str) -> dict:
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if start is None:
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return {'name': key, 'phone': value, 'next': None}
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ptr = start
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while True:
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if ptr['name'] == key:
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ptr['phone'] = value
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return start
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if ptr['next'] is None:
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ptr['next'] = {'name': key, 'phone': value, 'next': None}
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return start
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ptr = ptr['next']
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