84 lines
2.1 KiB
Python
84 lines
2.1 KiB
Python
# phonebook.py
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# Узел списка: {'n': имя, 'p': телефон, 'nxt': следующий}
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def ll_insert(head, name, phone):
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# обновление, если уже есть
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curr = head
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while curr is not None:
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if curr['n'] == name:
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curr['p'] = phone
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return head
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curr = curr['nxt']
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# вставка в начало (новый узел становится головой)
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new_node = {'n': name, 'p': phone, 'nxt': head}
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return new_node
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def ll_find(head, name):
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curr = head
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while curr is not None:
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if curr['n'] == name:
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return curr['p']
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curr = curr['nxt']
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return None
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def ll_delete(head, name):
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if head is None:
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return None
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if head['n'] == name:
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return head['nxt']
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prev = head
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curr = head['nxt']
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while curr is not None:
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if curr['n'] == name:
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prev['nxt'] = curr['nxt']
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return head
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prev = curr
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curr = curr['nxt']
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return head
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def ll_list_all(head):
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records = []
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curr = head
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while curr is not None:
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records.append((curr['n'], curr['p']))
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curr = curr['nxt']
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records.sort(key=lambda x: x[0])
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return records
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# хеш-функция – сумма ord(name) % size
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def _hash(name, size):
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h = 0
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for ch in name:
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h += ord(ch)
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return h % size
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SIZE = 13 # фиксированный размер таблицы
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def ht_create():
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return [None] * SIZE
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def ht_insert(buckets, name, phone):
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idx = _hash(name, len(buckets))
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buckets[idx] = ll_insert(buckets[idx], name, phone)
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return buckets
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def ht_find(buckets, name):
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idx = _hash(name, len(buckets))
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return ll_find(buckets[idx], name)
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def ht_delete(buckets, name):
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idx = _hash(name, len(buckets))
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buckets[idx] = ll_delete(buckets[idx], name)
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return buckets
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def ht_list_all(buckets):
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all_records = []
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for head in buckets:
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curr = head
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while curr:
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all_records.append((curr['n'], curr['p']))
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curr = curr['nxt']
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all_records.sort(key=lambda x: x[0])
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return all_records |