class QueueLinkedList:
def __init__(self):
self.lst = None
def createQueue(self):
self.lst = SingleLinkedList()
def enqueque(self, value):
if self.lst is not None:
self.lst.insert(value)
else:
print("Queue not created")
def dequeue(self):
if not self.isEmpty():
tmp = self.lst.head
self.lst.head = self.lst.head.next
return tmp
raise ValueError("Empty list")
def peek(self):
if not self.isEmpty():
return self.lst.head.value
raise ValueError("Empty list")
def isEmpty(self):
return self.lst is None or self.lst.head is None
def deleteQueue(self):
self.lst = None
def test_search_whenItemIsAvailable_returnsNode(self):
sl = SingleLinkedList()
sl.add(1)
sl.add(2)
item1 = sl.search(1)
item2 = sl.search(2)
self.assertTrue(item1.value == 1)
self.assertTrue(item2.value == 2)
def test_reverse_whenListReversed_returnsAppropriateHeadAndTail(self):
sl = SingleLinkedList()
sl.add(1)
sl.add(2)
sl.add(3)
sl.reverse()
self.assertEqual(sl.head.value, 3)
self.assertEqual(sl.tail.value, 1)
def sumForward(l1, l2):
if (l1 is None or l1.head is None):
return l2
if (l2 is None or l2.head is None):
return l1
p1 = l1.head
p2 = l2.head
# Sum the heads
value = int(p1.data + p2.data) % 10
carry = int(p1.data + p2.data) // 10
sum = SingleLinkedList(Node(value))
# Loop over p1
while not p1.next is None:
if not p2.next is None:
value = int(p1.next.data + p2.next.data + carry) % 10
carry = int(p1.next.data + p2.next.data + carry) // 10
sum.appendToTail(value)
p2 = p2.next
else:
value = int(p1.next.data + carry) % 10
carry = int(p1.next.data + carry) // 10
sum.appendToTail(value)
p1 = p1.next
# p1 is done. Check if there is anything left in p2 to be added.
while not p2.next is None:
value = int(p2.next.data + carry) % 10
carry = int(p2.next.data + carry) // 10
sum.appendToTail(value)
p2 = p2.next
# Add the carry
if carry > 0:
sum.appendToTail(carry)
return sum
def test_remove_whenElemIsTail_returnsRemovedNode(self):
sl = SingleLinkedList()
sl.add(1)
sl.add(2)
sl.add(3)
removed = sl.remove(3)
self.assertEqual(removed.value, 3)
def test_remove_whenElemInMiddle_returnsRemovedNode(self):
sl = SingleLinkedList()
sl.add(11)
sl.add(32)
sl.add(44)
sl.add(99)
removedNode = sl.remove(44)
self.assertTrue(removedNode.value, 44)
def partition(sll, x):
sll_gx = None
n = sll.head
# Check for single node list
if (n.next == None):
return sll
if n.data >= x:
sll.deleteNode(n.data)
sll_gx.appendToTail(n.data)
while (n.next != None):
if (n.next.data >= x):
new_node = Node(n.next.data)
#This already skips the n.next if ends up deleted
sll.deleteNode(n.next.data)
if sll_gx == None:
sll_gx = SingleLinkedList(new_node)
else:
sll_gx.appendToTail(new_node.data)
else:
n = n.next
sll.printList()
sll_gx.printList()
sll.attach(sll_gx.head)
sll.printList()
return sll
def test_add_updatesTailCorrectly(self):
sl = SingleLinkedList()
sl.add(1)
sl.add(2)
sl.add(100)
self.assertEqual(sl.tail.value, 100)
def main():
n = Node(3)
sll = SingleLinkedList(n)
buffer = [5, 8, 5, 10, 2, 1]
for b in buffer:
sll.appendToTail(b)
sll.printList()
print("Partioning...")
partition(sll, 5)
l1 = l1.next
else:
l3.next = l2
l2 = l2.next
l3 = l3.next
if l1:
l3.next = l1
if l2:
l3.next = l2
return dummy.next
if __name__ == '__main__':
test_list = SingleLinkedList()
for i in range(1, 2):
test_list.append(i)
head = test_list.head
opt_list = Solution()
# ret_head = opt_list.removeNthFromEnd(head, 1)
# ret_head = opt_list.reverseList(head)
# ret_head = opt_list.swapPairs(head)
l1 = SingleLinkedList()
def test_search_whenItemIsNotAvailable_returnsFalse(self):
sl = SingleLinkedList()
sl.add(1)
item2 = sl.search(2)
self.assertEqual(item2, False)
def main():
n = Node(0)
sll = SingleLinkedList(n)
sll.appendToTail(1)
sll.appendToTail(2)
sll.appendToTail(3)
for i in range(4):
sll.appendToTail(0)
for i in range(3):
sll.appendToTail(3)
for i in range(6):
sll.appendToTail(0)
for i in range(2):
sll.appendToTail(6)
sll.printList()
removeDups(sll)
print("After duplicate removal")
sll.printList()
for i in range(4):
sll.appendToTail(0)
for i in range(3):
sll.appendToTail(3)
for i in range(6):
sll.appendToTail(0)
for i in range(2):
sll.appendToTail(6)
print("After duplicate removal no buff")
removeDups_noBuf(sll)
sll.printList()
def test_search_whenHeadIsNone_returnsFalse(self):
sl = SingleLinkedList()
returnValue = sl.search(1)
self.assertEqual(False, returnValue)
def test_add_addingFirstElem_savesAsHead(self):
sl = SingleLinkedList()
sl.add(1)
self.assertEqual(sl.head.value, 1)
def sumBackward(l1, l2):
if (l1 is None or l1.head is None):
return l2
if (l2 is None or l2.head is None):
return l1
length1 = GetSize(l1)
length2 = GetSize(l2)
print("Sizes: ", length1, length2)
diff = length1 - length2
if (diff > 0):
for i in range(diff):
l2.appendToHead(0)
elif (diff < 0):
for i in range(abs(diff)):
l1.appendToHead(0)
#l1.printList()
#l2.printList()
p1 = l1.head
p2 = l2.head
#Create a sum linked list holding 0
sum = SingleLinkedList(Node(0))
#p3 points to the end of the list all the time.
p3 = sum.head
value = int(p1.data + p2.data) % 10
carry = int(p1.data + p2.data) // 10
# Add the element and update p3
p3 = attachElement(p3, value, carry)
# Run through p1
while not p1.next is None:
if (not p2.next is None):
value = int((p1.next.data + p2.next.data)) % 10
carry = int(p1.next.data + p2.next.data) // 10
p3 = attachElement(p3, value, carry)
p2 = p2.next
else:
p3 = attachElement(p3, p1.next.data, carry)
#At this point carry will be always 0
carry = 0
p1 = p1.next
# Now we just need to attach p2 in the case p1 was smaller
while (not p2.next is None):
p3 = attachElement(p3, p2.next.data, carry)
carry = 0
p2 = p2.next
#Check if sum head is 0. If is 0, then remove the head. Will return an empty list, then
if (sum.head.data == 0):
sum.deleteNode(0)
return sum
from LinkedList import SingleLinkedList items = SingleLinkedList() items.add_first(1) items.add_last(2) items.add_last(3) items.add_last(4) items.add_last(5) items.print_out() print(items.indexOf(2)) items.delete_first() items.print_out() items.delete_last() items.print_out() items.reverse() items.print_out() print(items.get_kth_from_end(2))
def test_remove_whenElemNotPresent_returnsFalse(self):
sl = SingleLinkedList()
removed = sl.remove(1)
self.assertFalse(removed)
def test_add_addingSecondElem_hasLengthOfTwo(self):
sl = SingleLinkedList()
sl.add(1)
sl.add(2)
self.assertEqual(len(sl), 2)
def createQueue(self):
self.lst = SingleLinkedList()
def main():
ll1 = SingleLinkedList(Node(7))
ll1.appendToTail(1)
ll1.appendToTail(6)
ll2 = SingleLinkedList(Node(5))
ll2.appendToTail(9)
ll2.appendToTail(2)
ll1.printList()
printForward(ll1)
ll2.printList()
printForward(ll2)
sum = sumForward(ll1, ll2)
ll1 = SingleLinkedList(Node(1))
ll2 = SingleLinkedList(Node(9))
ll2.appendToTail(9)
sum = sumForward(ll1, ll2)
printForward(sum)
ll1 = SingleLinkedList(Node(6))
ll1.appendToTail(1)
ll1.appendToTail(7)
ll2 = SingleLinkedList(Node(2))
ll2.appendToTail(9)
ll2.appendToTail(5)
printBackward(ll1)
printBackward(ll2)
print("Summing backwards")
sum = sumBackward(ll1, ll2)
printBackward(sum)
print("Special Case")
ll1 = SingleLinkedList(Node(1))
ll1.appendToTail(2)
ll1.appendToTail(3)
ll1.appendToTail(4)
ll2 = SingleLinkedList(Node(5))
ll2.appendToTail(6)
ll2.appendToTail(7)
sum = sumBackward(ll1, ll2)
printBackward(sum)