97 lines
2.3 KiB
Python
97 lines
2.3 KiB
Python
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def llist_insert(head, name, phone):
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current = head
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while current is not None:
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if current['name'] == name:
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current['phone'] = phone
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return head
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current = current['next']
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new_node = {'name': name, 'phone': phone, 'next': None}
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if head is None:
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return new_node
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current = head
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while current['next'] is not None:
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current = current['next']
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current['next'] = new_node
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return head
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def llist_find(head, name):
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current = head
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while current is not None:
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if current['name'] == name:
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return current['phone']
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current = current['next']
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return None
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def llist_delete(head, name):
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if head is None:
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return None
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if head['name'] == name:
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return head['next']
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prev = head
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current = head['next']
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while current is not None:
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if current['name'] == name:
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prev['next'] = current['next']
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return head
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prev = current
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current = current['next']
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return head
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def llist_get_all(head):
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entries = []
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current = head
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while current is not None:
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entries.append((current['name'], current['phone']))
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current = current['next']
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entries.sort(key=lambda x: x[0])
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return entries
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BUCKET_SIZE = 1000
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def ht_create():
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return [None] * BUCKET_SIZE
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def ht_insert(table, name, phone):
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idx = hash(name) % len(table)
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table[idx] = llist_insert(table[idx], name, phone)
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return table
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def ht_find(table, name):
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idx = hash(name) % len(table)
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return llist_find(table[idx], name)
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def ht_delete(table, name):
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idx = hash(name) % len(table)
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table[idx] = llist_delete(table[idx], name)
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return table
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def ht_get_all(table):
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all_entries = []
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for head in table:
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current = head
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while current is not None:
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all_entries.append((current['name'], current['phone']))
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current = current['next']
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all_entries.sort(key=lambda x: x[0])
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return all_entries
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if __name__ == '__main__':
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table = ht_create()
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ht_insert(table, "Alice", "111-222")
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ht_insert(table, "Bob", "333-444")
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ht_insert(table, "Alice", "555-666")
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print(ht_find(table, "Alice"))
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print(ht_find(table, "Bob"))
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print(ht_find(table, "Charlie"))
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ht_delete(table, "Bob")
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print(ht_get_all(table)) |