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Design Linked List
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Design Linked List
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class ListNode:
def __init__(self,val, next = None):
self.val = val
self.next = next
class MyLinkedList:
def __init__(self):
self.head = None
self.size = 0
def get(self, index: int) -> int:
if index >= self.size:
return -1
node = self.head
for _ in range(index):
node = node.next
return node.val
def addAtHead(self, val: int) -> None:
self.addAtIndex(0,val)
def addAtTail(self, val: int) -> None:
self.addAtIndex(self.size,val)
def addAtIndex(self, index: int, val: int) -> None:
if index > self.size:
return
node = self.head
new_node = ListNode(val)
if index == 0:
new_node.next = node
self.head = new_node
else:
for _ in range(index - 1):
node = node.next
new_node.next = node.next
node.next = new_node
self.size += 1
def deleteAtIndex(self, index: int) -> None:
if index >= self.size:
return
if index == 0:
self.head = self.head.next
else:
node = self.head
for _ in range(index-1):
node = node.next
node.next = node.next.next
self.size -= 1
# Your MyLinkedList object will be instantiated and called as such:
# obj = MyLinkedList()
# param_1 = obj.get(index)
# obj.addAtHead(val)
# obj.addAtTail(val)
# obj.addAtIndex(index,val)
# obj.deleteAtIndex(index)