195 lines
4.7 KiB
Python
195 lines
4.7 KiB
Python
def ll_insert(head, name, phone):
|
|
|
|
new_node = {'name': name, 'phone': phone, 'next': None}
|
|
|
|
if head is None:
|
|
return new_node
|
|
|
|
current = head
|
|
while current['next'] is not None:
|
|
current = current['next']
|
|
|
|
current['next'] = new_node
|
|
return head
|
|
|
|
def ll_find(head, name):
|
|
current = head
|
|
while current is not None:
|
|
if current['name'] == name:
|
|
return current['phone']
|
|
current = current['next']
|
|
return None
|
|
|
|
def ll_delete(head, name):
|
|
if head is None:
|
|
return None
|
|
if head['name'] == name:
|
|
return head['next']
|
|
current = head
|
|
while current['next'] is not None:
|
|
if current['next']['name'] == name:
|
|
current['next'] = current['next']['next']
|
|
return head
|
|
current = current['next']
|
|
return head
|
|
|
|
def ll_list_all(head):
|
|
records = []
|
|
current = head
|
|
|
|
while current is not None:
|
|
records.append((current['name'], current['phone']))
|
|
current = current['next']
|
|
records.sort(key=lambda x: x[0])
|
|
return records
|
|
|
|
def hash_function(name, table_size):
|
|
total = 0
|
|
for ch in name:
|
|
total = (total*31 + ord(ch)) % table_size
|
|
return total
|
|
|
|
def ht_create(size=1000):
|
|
return [None]*size
|
|
|
|
def ht_insert(buckets, name, phone):
|
|
idx = hash_function(name, len(buckets))
|
|
buckets[idx] = ll_insert(buckets[idx], name, phone)
|
|
return buckets
|
|
|
|
def ht_find(buckets, name):
|
|
idx = hash_function(name, len(buckets))
|
|
return ll_find(buckets[idx], name)
|
|
|
|
def ht_delete(buckets, name):
|
|
idx = hash_function(name, len(buckets))
|
|
buckets[idx] = ll_delete(buckets[idx], name)
|
|
return buckets
|
|
|
|
def ht_list_all(buckets):
|
|
records = []
|
|
for bucket in buckets:
|
|
current = bucket
|
|
while current is not None:
|
|
records.append((current['name'], current['phone']))
|
|
current = current['next']
|
|
records.sort(key=lambda x: x[0])
|
|
return records
|
|
|
|
def bst_insert(root, name, phone):
|
|
|
|
new_node = {'name': name, 'phone': phone, 'left': None, 'right': None}
|
|
|
|
if root is None:
|
|
return new_node
|
|
|
|
current = root
|
|
while True:
|
|
if name < current['name']:
|
|
if current['left'] is None:
|
|
current['left'] = new_node
|
|
break
|
|
current = current['left']
|
|
elif name > current['name']:
|
|
if current['right'] is None:
|
|
current['right'] = new_node
|
|
break
|
|
current = current['right']
|
|
else:
|
|
current['phone'] = phone
|
|
break
|
|
|
|
return root
|
|
|
|
|
|
def bst_find(root, name):
|
|
|
|
current = root
|
|
while current is not None:
|
|
if name == current['name']:
|
|
return current['phone']
|
|
elif name < current['name']:
|
|
current = current['left']
|
|
else:
|
|
current = current['right']
|
|
return None
|
|
|
|
|
|
def _bst_find_min(node):
|
|
|
|
current = node
|
|
while current['left'] is not None:
|
|
current = current['left']
|
|
return current
|
|
|
|
|
|
def bst_delete(root, name):
|
|
|
|
if root is None:
|
|
return None
|
|
|
|
parent = None
|
|
current = root
|
|
|
|
while current is not None and current['name'] != name:
|
|
parent = current
|
|
if name < current['name']:
|
|
current = current['left']
|
|
else:
|
|
current = current['right']
|
|
|
|
if current is None:
|
|
return root
|
|
|
|
if current['left'] is None and current['right'] is None:
|
|
if parent is None:
|
|
return None
|
|
if parent['left'] == current:
|
|
parent['left'] = None
|
|
else:
|
|
parent['right'] = None
|
|
return root
|
|
|
|
if current['left'] is None:
|
|
child = current['right']
|
|
elif current['right'] is None:
|
|
child = current['left']
|
|
else:
|
|
successor_parent = current
|
|
successor = current['right']
|
|
while successor['left'] is not None:
|
|
successor_parent = successor
|
|
successor = successor['left']
|
|
|
|
current['name'] = successor['name']
|
|
current['phone'] = successor['phone']
|
|
|
|
if successor_parent['left'] == successor:
|
|
successor_parent['left'] = successor['right']
|
|
else:
|
|
successor_parent['right'] = successor['right']
|
|
|
|
return root
|
|
|
|
if parent is None:
|
|
return child
|
|
if parent['left'] == current:
|
|
parent['left'] = child
|
|
else:
|
|
parent['right'] = child
|
|
|
|
return root
|
|
|
|
|
|
def bst_list_all(root):
|
|
records = []
|
|
|
|
def inorder(node):
|
|
if node is None:
|
|
return
|
|
inorder(node['left'])
|
|
records.append((node['name'], node['phone']))
|
|
inorder(node['right'])
|
|
|
|
inorder(root)
|
|
return records |