def mklist(initializer):
head = temp = Node(initializer[0], None)
for i in xrange(1, len(nums)):
n = Node(initializer[i], None)
temp.setNext(n)
temp = temp.getNext()
return head
def mklist(initializer):
head = temp = Node(initializer[0], None)
for i in xrange(1, len(nums)):
n = Node(initializer[i], None)
temp.next = n
temp = temp.next
return head
def insertLast(self,data): newNode=Node() newNode.setData(data) if self.length==0: self.head=newNode else: current=self.head while current.getNext()!=None: current=current.getNext() current.setNext(newNode) self.length+=1
def removeDup(head):
new_head = Node(head.data, None, None)
tail = new_head
head = head.next
while head is not None:
if head.data != tail.data:
node = Node(head.data, tail, None)
tail.next = node
tail = tail.next
head = head.next
return new_head
def rearrange(head):
slowptr = head
fastptr = head
prev = None
while fastptr is not None and fastptr.next is not None:
prev = slowptr
slowptr = slowptr.next
fastptr = fastptr.next.next
head1 = head
head2 = slowptr
prev.next = None
head2 = reverseList(head2)
pl(head1)
pl(head2)
head = Node(-1, None)
curr = head
while head1 is not None or head2 is not None:
if head1 is not None:
curr.next = head1
curr = curr.next
head1 = head1.next
if head2 is not None:
curr.next = head2
curr = curr.next
head2 = head2.next
return head.next
def merge(node_a, node_b):
if node_a is None:
return node_b
if node_b is None:
return node_a
if node_a.data < node_b.data:
node = Node(node_a.data, None, None)
node.next = merge(node_a.next, node_b)
else:
node = Node(node_b.data, None, None)
node.next = merge(node_a, node_b.next)
node.next.prev = node
node.prev = None
return node
def evenodd(head):
head1 = Node(-1, None)
head2 = Node(-1, None)
h1 = head1
h2 = head2
while head is not None:
h1.next = head
h1 = h1.next
head = head.next
if head is not None:
h2.next = head
h2 = h2.next
head = head.next
h2.next = None
h1.next = head2.next
return head1.next
def insertionSort(head):
if head is not None:
root = Node(head.data, None)
curr = root
head = head.next
while head is not None:
prev = None
curr = root
if head.data < root.data:
node = Node(head.data, root)
root = node
head = head.next
continue
while curr.next is not None and curr.next.data < head.data:
prev = curr
curr = curr.next
node = Node(head.data, curr.next)
curr.next = node
head = head.next
return root
def insert(head, data):
if head is None:
head = Node(data, None)
head.next = head
return head
elif data <= head.data:
curr = head
while curr.next is not head:
curr = curr.next
node = Node(data, head)
curr.next = node
head = node
return head
else:
curr = head
while curr.next is not head and data > curr.next.data:
curr = curr.next
node = Node(data, curr.next)
curr.next = node
return head
def huffman(s): # s为列表列表里的元素是由频率以及对应的字符[(频率，字符)]
s.sort()
n = len(s)
pq = []
for i in range(n):
a = Node(s[i][0])
a.symbol = s[i][1]
pq.append(a)
def insert(ss, rr): # 为rr找出插入位置使得ss是按里面元素的频率从小到大排序
long = len(ss)
def _insert(low, high):
if low > high:
ss.insert(low, rr)
else:
mid = int((low + high) / 2)
if rr.frequency <= ss[mid].frequency:
_insert(low, mid - 1)
else:
_insert(mid + 1, high)
_insert(0, long - 1)
k = 1
while k <= n - 1:
r = Node(pq[0].frequency + pq[1].frequency)
r.left = pq[0]
r.right = pq[1]
del pq[0]
del pq[0]
insert(pq, r)
k += 1
r = pq[0]
# return r # 霍夫曼树根节点
result_code = []
def _get_huffman_code(node, code_value=[]): # 得到各个字符的编码
if node.symbol is not None:
# print(''.join(code_value), node.symbol) # 编码结果
result_code.append((''.join(code_value), node.symbol))
else:
_get_huffman_code(node.left, code_value + ['0'])
_get_huffman_code(node.right, code_value + ['1'])
_get_huffman_code(r, [])
return result_code
def addOne(head):
num1 = getNum(head)
head = reverseList(head)
curr = head
carry = 1
prev = None
while curr is not None:
sum = carry + curr.data
carry = 1 if sum >= 10 else 0
sum = sum % 10
curr.data = sum
prev = curr
curr = curr.next
if carry >= 1:
prev.next = Node(carry, None)
head = reverseList(head)
num2 = getNum(head)
return num1, num2
node = gethalf(head)
second_half = node.next
#print(head.data,second_half.data )
#time.sleep(1)
node.next = None
first_half = head
node_a = mergesort(first_half)
node_b = mergesort(second_half)
return merge(node_a, node_b)
if __name__ == "__main__":
res = []
for x in xrange(1000):
size = random.randint(1, 100)
head = Node(random.randint(1, 100), None)
for i in xrange(1, size):
node = Node(random.randint(1, 100), head)
head = node
#printlist(head)
head = mergesort(head)
res.append(issorted(head))
print("{} pass".format(res.count(True)))
print("{} fail".format(res.count(False)))
curr.next = node
if node.next is not None:
node.next.prev = node
return head
if __name__ == "__main__":
res = []
for i in xrange(10000):
prev = None
head = None
size = randint(1, 1000)
for i in xrange(size):
head = Node(randint(-100, 100), prev, head)
if prev is not None:
prev.prev = head
prev = head
if head is not None:
head.prev = None
#printlist(head)
head = insertionSort(head)
#printlist(head)
#print("isLinkListSorted" , isLinkListSorted(head))
res.append(isLinkListSorted(head))
print("%s Pass." % (res.count(True)))
print("%s Fail." % (res.count(False)))
head = reverseList(head)
num2 = getNum(head)
return num1, num2
def test(num1, num2):
return True if num2 == num1 + 1 else False
if __name__ == "__main__":
head = None
res = []
for i in xrange(3000):
head = None
size = random.randint(3, 18)
for i in xrange(size, 0, -1):
if i == size:
head = Node(random.randint(1, 9), head)
else:
head = Node(random.randint(0, 9), head)
num1, num2 = addOne(head)
truth = test(num1, num2)
if not truth:
print(num1, num2)
res.append(truth)
print("\n%s Pass." % (res.count(True)))
print("%s Fail." % (res.count(False)))
def cutHalf(head):
slowptr = head
fastptr = head
while fastptr.next != head and fastptr.next.next != head:
slowptr = slowptr.next
fastptr = fastptr.next.next
if fastptr.next.next == head:
fastptr = fastptr.next
firsthead = slowptr.next
slowptr.next = None
fastptr.next = None
return head, firsthead
if __name__ == "__main__":
head = tail = Node(10, None)
for i in xrange(9, -1, -1):
head = Node(i, head)
tail.next = head
printlist(head)
head1, head2 = cutHalf(head)
printlist(head1)
printlist(head2)
while curr is not None and c < k:
next = curr.next
curr.next = prev
curr.prev = next
prev = curr
curr = next
c += 1
if next is not None:
head.next = reverseKNode(next, k)
head.next.prev = head
else:
head.next = None
return prev
if __name__ == "__main__":
prev = None
head = None
for i in xrange(10):
head = Node(randint(2, 10), prev, head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
printlist(head)
head = reverseKNode(head, 2)
printlist(head)
curr.next = temp.next
del temp
else:
curr = curr.next
maxval = max(maxval, curr.data)
head = reverse(head)
return head
def reverse(head):
curr = head
prev = None
while curr is not None:
next = curr.next
curr.next = prev
prev = curr
curr = next
return prev
if __name__ == "__main__":
head = None
for i in xrange(0, 21):
node = Node(randint(1,100), head)
head = node
printlist(head)
head = deleteMax(head)
printlist(head)
from __future__ import print_function
from linklist import SimpleNode as Node
from linklist import printlist
def printReverse(head):
if head is None:
return
printReverse(head.next)
print(head.data, end="->")
if __name__ == "__main__":
head = Node(0, None)
for i in xrange(1, 10):
node = Node(i, head)
head = node
printlist(head)
print("Reverse list : ")
printReverse(head)
def push(self, data):
new_node = Node(data)
new_node.next = self.top.next
self.top.next = new_node
return self
kthtwo = head
i = 0
while i < k and kthtwo is not None:
kthtwo = kthtwo.next
i += 1
runner = kthtwo
kthtwo = head
while runner is not None:
runner = runner.next
kthtwo = kthtwo.next
kthone.data, kthtwo.data = kthtwo.data, kthone.data
return head
if __name__ == "__main__":
head = None
nums = [1, 2, 3, 4, 5, 6, 7, 8]
nums.reverse()
for i in xrange(len(nums)):
head = Node(nums[i], head)
printlist(head)
head = swapKth(head, 1)
printlist(head)
head = swapKth(head, 2)
printlist(head)
def evenodd(head):
head1 = Node(-1, None)
head2 = Node(-1, None)
h1 = head1
h2 = head2
while head is not None:
h1.next = head
h1 = h1.next
head = head.next
if head is not None:
h2.next = head
h2 = h2.next
head = head.next
h2.next = None
h1.next = head2.next
return head1.next
if __name__ == "__main__":
head = None
for i in xrange(11, 0, -1):
node = Node(i, head)
head = node
printlist(head)
head = evenodd(head)
printlist(head)
def reverse(head):
prev = None
curr = head
while curr is not None:
next = curr.next
curr.next = prev
curr.prev = next
prev = curr
curr = next
return prev
if __name__ == "__main__":
prev = None
head = None
for i in xrange(10, 0, -1):
head = Node(i, prev, head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
tail = printlist(head)
head = reverse(head)
printlist(head)
def deleteAllKeys(head, key):
if head is not None:
node = head
while node is not None:
if node.data == key :
delete(node)
node = node.next
return head
if __name__ == "__main__":
prev = None
head = None
for i in xrange(12):
head = Node(randint(0,8), prev , head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
printlist(head)
head = deleteAllKeys(head, 4)
printlist(head)
node_a = mergesort(first_half)
node_b = mergesort(second_half)
return merge(node_a, node_b)
if __name__ == "__main__":
res = []
head = None
for i in xrange(10000):
size = randint(1, 100)
head = None
prev = None
for i in xrange(size):
head = Node(randint(1, size*2), prev, head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
head = mergesort(head)
res.append(isLinkListSorted(head))
print("%s Pass."%(res.count(True)))
print("%s Fail."%(res.count(False)))
prev = None
res = []
alp = {
"level": True,
"leel": True,
"Hello": False,
"lallal": True,
"Anna": False,
"Jazz": False
}
for key, val in alp.iteritems():
#print(key , val)
head = prev = None
for i in xrange(len(key)):
head = Node(key[i], prev, head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
#printlist(head)
if val is isPallindrome(head):
res.append(True)
else:
res.append(False)
#res.append(val is isPallindrome(head))
print("%s Pass." % (res.count(True)))
print("%s Fail." % (res.count(False)))
return False
def isIdenticalItr(one, two):
while one is not None and two is not None:
if one.data != two.data:
return False
one = one.next
two = two.next
return one is None and two is None
if __name__ == "__main__":
head_one = Node(0, None)
for i in xrange(1,10):
node = Node(i, head_one)
head_one = node
head_two = Node(0, None)
for i in xrange(1,10):
node = Node(i, head_two)
head_two = node
head_three = Node(0, None)
for i in xrange(1,5):
node = Node(i, head_three)
head_three = node
for i in xrange(1,5):
node = Node(randint(1,100), head_three)
#!/usr/bin/python __author__ = "Vishal Jasrotia. Stony Brook University" __copyright__ = "" __license__ = "GPL" __version__ = "1.0" __maintainer__ = "Vishal Jasrotia" __email__ = "*****@*****.**" __status__ = "" import os, sys from linklist import Node a = Node(1 ,None) b = Node(2 ,a) c = Node(3 ,b) d = Node(4 ,c) e = Node(5 ,d) f = Node(6 ,e) g = Node(7 ,f) h = Node(8 ,g) i = Node(9 ,h) j = Node(10 ,i) k = Node(11 ,j) l = Node(12 ,k) m = Node(13 ,l) n = Node(14 ,m) #create circle a.setNext(h)
first_half.next = None
second_half.prev = None
first_half = head
printlist(first_half)
printlist(second_half)
second_half = reverse(second_half)
printlist(second_half)
return merge(first_half, second_half)
if __name__ == "__main__":
prev = None
head = None
nums = [1, 3, 5, 7, 8, 9, 10, 9, 8, 6, 4, 2, 1, 0]
for i in xrange(len(nums)):
head = Node(nums[i], prev, head)
if prev is not None:
prev.prev = head
prev = head
head.prev = None
printlist(head)
head = sort(head)
printlist(head)
