-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathsingly_linked_list_operations.py
105 lines (72 loc) · 2.08 KB
/
singly_linked_list_operations.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
class Node:
def __init__(self, data):
self.data = data
self.next = None
class LinkedList:
def __init__(self):
self.head = None
def clear(self): # O(1)
self.head = None
def append(self, data): # # O(N)
if self.head:
pointer = self.head
while pointer.next: # # O(N)
pointer = pointer.next
pointer.next = Node(data)
else:
self.head = Node(data)
def delete(self, index): # # O(N)
if index == 0:
self.head = self.head.next
else:
pointer = self[index - 1] # # O(N)
pointer.next = pointer.next.next
def insert(self, index, data): # # O(N)
node = Node(data)
if index == 0:
node.next = self.head
self.head = node
else:
pointer = self[index - 1] # # O(N)
node.next = pointer.next
pointer.next = node
def __len__(self): # # O(N)
count = 0
pointer = self.head
while pointer:
count += 1
pointer = pointer.next
return count
def __getitem__(self, index): # # O(N)
pointer = self.head
while index > 0: # # O(N)
pointer = pointer.next
index -= 1
return pointer
def __setitem__(self, index, data): # # O(N)
pointer = self[index]
pointer.data = data
def print_linked_list(linked_list: LinkedList):
print("**** Printing linked list ****")
pointer = linked_list.head
while pointer:
print(pointer.data)
pointer = pointer.next
print("**** End ****")
linked_list = LinkedList()
linked_list.append(0)
linked_list.append(10)
linked_list.append(20)
linked_list.append(30)
linked_list.append(40)
linked_list.append(50)
print_linked_list(linked_list)
linked_list.delete(4)
print_linked_list(linked_list)
linked_list.insert(4, 41)
print_linked_list(linked_list)
linked_list[2] = 23
print_linked_list(linked_list)
print(len(linked_list))
linked_list.clear()
print_linked_list(linked_list)