def test_iterate():
linked_list = LinkedList()
for i in 'abc':
linked_list.insert(i)
j = -1
for i in linked_list:
j += 1
assert i == 'abc'[::-1][j]
class AdjacencyList:
def __init__(self, head: Vertex):
self.head = head
self.edgenodes = LinkedList()
self.degree = 0
def connect(self, edge: Edge):
self.edgenodes.insert(Edgenode(head=self.head, edge=edge))
self.degree += 1
def partition_list(list, number):
greater_than_number_list = L.LinkedList()
lesser_than_number_list = L.LinkedList()
current = list.head
while current is not None:
if current.data > number:
greater_than_number_list.add(current.data)
else:
lesser_than_number_list.add(current.data)
current = current.next
lesser_than_number_list_tail = lesser_than_number_list.head
while lesser_than_number_list_tail.next is not None:
lesser_than_number_list_tail = lesser_than_number_list_tail.next
lesser_than_number_list_tail.next = greater_than_number_list.head
return lesser_than_number_list
def sum_lists_forward(list_a, list_b):
tail_a = list_a.seek_tail()
tail_b = list_b.seek_tail()
sum_list = LinkedList.LinkedList_Single()
carry = 0
while tail_a is not None or tail_b is not None:
if tail_a is None:
temp_sum = tail_b.data + carry
elif tail_b is None:
temp_sum = tail_a.data + carry
else:
temp_sum = tail_a.data + tail_b.data + carry
if temp_sum > 9:
sum_list.add_node_to_head(temp_sum%10)
carry = 1
else:
sum_list.add_node_to_head(temp_sum)
carry = 0
list_a.remove_tail()
list_b.remove_tail()
tail_a = list_a.seek_tail()
tail_b = list_b.seek_tail()
if carry != 0:
sum_list.add_node_to_head(carry)
return sum_list
def test_delete():
linked_list = LinkedList()
abc = a, b, c = list('abc')
for i in abc:
linked_list.insert(i)
linked_list.delete(b)
assert linked_list.head.item is c
assert linked_list.head.next.item is a
assert linked_list.tail.item is a
linked_list.delete(a)
assert linked_list.head.item is c
assert linked_list.head.next.item is None
assert linked_list.tail.item is c
linked_list.delete(c)
assert linked_list.head.item is None
assert linked_list.tail.item is None
def sum_lists_backward(list_a, list_b):
current_a = list_a.head
current_b = list_b.head
# sum = []
sum = LinkedList.LinkedList_Single()
carry = 0
while current_a is not None or current_b is not None:
if current_a is None:
temp_sum = current_b.data + carry
elif current_b is None:
temp_sum = current_a.data + carry
else:
temp_sum = current_a.data + current_b.data + carry
if temp_sum > 9:
# sum.append(temp_sum%10)
sum.add_node_to_list(temp_sum%10)
carry = 1
else:
# sum.append(temp_sum)
sum.add_node_to_list(temp_sum)
carry = 0
if current_a:
current_a = current_a.next
if current_b:
current_b = current_b.next
if carry != 0:
# sum.append(carry)
sum.add_node_to_list(carry)
return sum
def remove_duplicates_without_buffer(list):
current = L.SingleLinkedListNode("")
current.next = list.head
while current.next is not None:
inner_current = current.next
while inner_current.next is not None:
if current.next.data == inner_current.next.data:
inner_current.next = inner_current.next.next
else:
inner_current = inner_current.next
current = current.next
def insert(self, key, value):
hashval = hash(key) % len(self.hash_table)
curr = self.hash_table[hashval].root
self.hash_table[hashval].root.value = (None, None)
while curr.value[0] != key and curr.next != None:
curr = curr.next
if curr.value[0] == key:
curr.value[1] == value
else:
curr.next = LinkedList.Node((key, value))
self.hash_table[hashval].end = curr.next
def test_search_fail():
linked_list = LinkedList()
abc = a, b, c = list('abc')
for i in abc:
linked_list.insert(i)
with pytest.raises(FileNotFoundError):
linked_list.search('d')
def test_previous():
linked_list = LinkedList()
abc = a, b, c = list('abc')
for i in abc:
linked_list.insert(i)
assert linked_list.previous(a).item is b
assert linked_list.previous(b).item is c
assert linked_list.previous(c).item is None
def test_search():
linked_list = LinkedList()
abc = a, b, c = list('abc')
for i in abc:
linked_list.insert(i)
assert linked_list.search(a).item is a
assert linked_list.search(b).item is b
assert linked_list.search(c).item is c
def list_of_depths(children, result_list):
if len(children) is 0:
return
same_depth_list = LinkedList.LinkedList_Single()
for child in children:
same_depth_list.add_node_to_list(child)
result_list.append(same_depth_list)
children_of_children = []
current_node = same_depth_list.head
while current_node is not None:
if current_node.data.left_child is not None:
children_of_children.append(current_node.data.left_child)
if current_node.data.right_child is not None:
children_of_children.append(current_node.data.right_child)
current_node = current_node.next
list_of_depths(children_of_children, result_list)
def test_insert():
linked_list = LinkedList()
a, b = list('ab')
assert linked_list.head.item is None
assert linked_list.tail.item is None
linked_list.insert(a)
assert linked_list.head.item is a
assert linked_list.head.next.item is None
assert linked_list.tail.item is a
linked_list.insert(b)
assert linked_list.head.item is b
assert linked_list.head.next.item is a
assert linked_list.tail.item is a
def remove_duplicates_without_buffer(list):
current = L.SingleLinkedListNode("")
current.next = list.head
while current.next is not None:
inner_current = current.next
while inner_current.next is not None:
if current.next.data == inner_current.next.data:
inner_current.next = inner_current.next.next
else:
inner_current = inner_current.next
current = current.next
if __name__ == '__main__':
linked_list = L.LinkedList()
linked_list.add_array_of_elements_to_list(
[34, 1, 2, 1, 4, 5, 34, 6, 7, 34])
linked_list.print_list()
linked_list.add(23)
linked_list.print_list()
linked_list.remove_element_from_list(4)
linked_list.print_list()
remove_duplicates_without_buffer(linked_list)
linked_list.print_list()
single_linked_list = L.LinkedList_Single()
single_linked_list.add_array_of_data_to_linked_list([1, 1, 1, 1])
single_linked_list.print_list()
single_linked_list.add_array_of_data_to_linked_list([1, 1, 1, 1, 1])
single_linked_list.print_list()
from datastructures import LinkedList
def is_looped(list):
current = list.head
traversed_nodes = []
traversed_nodes.append(current)
while current.next is not None:
current = current.next
if current in traversed_nodes:
return True
traversed_nodes.append(current)
return False
if __name__ == '__main__':
list_a = LinkedList.LinkedList_Single()
list_a.add_array_of_data_to_linked_list([1, 2, 3, 4, 5, 6, 7])
list_a.print_list()
# list_a.seek_tail().next = list_a.head.next.next
print(is_looped(list_a))
print 'Wrong parameter provided, you asked to find 0 element'
return
first_node = alist.head
last_node = alist.head
# build a window spaced N
for i in range(1, n):
if last_node.next is None:
print 'There are only {} in the list'.format(i)
print alist
return
else:
last_node = last_node.next
# Move both pointers until we get to the end of the list
while last_node.next is not None:
last_node = last_node.next
first_node = first_node.next
# print N values found
print 'Last {} elements in the list: '.format(n),
for i in range(1, n + 1):
print first_node.value,
first_node = first_node.next
# Build a list with 10 elements for testing
ll = LinkedList()
for i in range(1, 21):
ll.insert(random.randint(1, 100))
print 'Given list:',
print ll
find_last_N(ll, 1)
def __init__(self, head: Vertex):
self.head = head
self.edgenodes = LinkedList()
self.degree = 0
def test_delete_fail():
linked_list = LinkedList()
for i in 'abc':
linked_list.insert(i)
with pytest.raises(FileNotFoundError):
linked_list.delete('d')
from datastructures import LinkedList as L
def partition_list(list, number):
greater_than_number_list = L.LinkedList()
lesser_than_number_list = L.LinkedList()
current = list.head
while current is not None:
if current.data > number:
greater_than_number_list.add(current.data)
else:
lesser_than_number_list.add(current.data)
current = current.next
lesser_than_number_list_tail = lesser_than_number_list.head
while lesser_than_number_list_tail.next is not None:
lesser_than_number_list_tail = lesser_than_number_list_tail.next
lesser_than_number_list_tail.next = greater_than_number_list.head
return lesser_than_number_list
if __name__ == '__main__':
linked_list = L.LinkedList()
linked_list.add_array_of_elements_to_list(
[34, 355, 124, 656, 123, 767, 34, 542, 123])
partitioned_list = partition_list(linked_list, 125)
partitioned_list.print_list()
def __init__(self, hash_table_size=19):
self.hash_table = [LinkedList() for _ in range(hash_table_size)]
def linked_list():
return LinkedList()
