def linked_list_add_forward(L1, L2, carry):
# compare length of linked lists and pad the shorter one with 0
l1_len = len_list(L1)
l2_len = len_list(L2)
if l1_len < l2_len:
L1 = padInFront(L1, l2_len - l1_len)
else:
L2 = padInFront(L2, l1_len - l2_len)
# Add lists
sumandcarry = addListsFwd2Helper(L1, L2)
#If there was a carry value left over, insert this at the front of the lit
#Otherwise, just return the linked list
result = LinkedList()
result.first = sumandcarry[0]
# If the carry is not 0, insert this at the front of the linked list
if sumandcarry[1] == 0:
return result
else:
result = insertBefore(result, sumandcarry[1])
return result
if node == None:
return None
fast = node
slow = node
firsthalf = []
while fast != None and fast.next != None:
firsthalf.append(slow.value)
slow = slow.next
fast = fast.next.next
if fast != None:
slow = slow.next
while slow != None:
if firsthalf.pop() != slow.value:
return False
else:
slow = slow.next
return True
L1 = randomLinkedList(3, 3, 4)
print(L1)
print(is_palindrome(L1.first))
L2 = LinkedList()
for i in range(1,4):
L2.addNode(i)
for i in range(3, 0, -1):
L2.addNode(i)
print(L2)
print(is_palindrome(L2.first))
fast = fast.next.next
if (slow == fast) :
break # collision
#error checking - no meeting point and therefore no loop
if (fast == None or fast.next == None):
return None
#move slow to head. Keep fast at meeting point.
#each are k steps from the loop start. If they move at same pace,
#they meet at loop start
slow = head
while(slow != fast):
slow = slow.next
fast = fast.next
#both now point to the start of loop
return fast
loop = LinkedListNode("C")
loop.next = LinkedListNode("D")
loop.next.next = LinkedListNode("E")
loop.next.next.next = loop
L1 = LinkedList()
L1.addReadyNode(loop)
L1.addNode("B")
L1.addNode("T")
L1.addNode("R")
L1.addNode("A")
print("start loop is :"+str(find_begining(L1.first)))
def padInFront(linkedlist, padding):
head = linkedlist
for i in range(padding):
insertBefore(head, 0)
return head
# Helper function to calculate length of a linked list
def len_list(linkedlist):
length = 0
current = linkedlist
while current != None:
length += 1
current = current.next
return length
first_number = LinkedList()
first_number.addNode(6)
first_number.addNode(1)
first_number.addNode(7)
second_number = LinkedList()
second_number.addNode(2)
second_number.addNode(9)
second_number.addNode(5)
print("First number: " + str(first_number))
print(" + ")
print("Second number: " + str(second_number))
print(" = ")
print(linked_list_add(first_number.first, second_number.first, 0).print_list())
print("===================================================")