""" Add_to_front(self, val) and add_to_back(self, val) functions can be used which are already done in python class. Name of list is LList
class node(object): def __init__(self, data, next=None): self.data = data self.next = next # Note: use the attributes directly; no setters or getters!
class LList(object): def __init__(self): self._size = 0 self._head = None self._tail = None
""" def set_data_at_index(self, idx, val): """ The value stored at index idx changes to val return True if the index was valid otherwise return False """ def insert_value_at_index(self, val, idx): """ The list increases in size. The new value is at index idx. The values previously in the list at idx or later appear after the new value. return If the index is valid, insert_value_at_index returns True. return If the index is not valid, insert_value_at_index returns False. """ def delete_item_at_index(self, idx): """ The list decreases in size if the index is valid The value at idx is no longer in the list. return True if index was valid otherwise return False """
Code:
class node(object):
def __init__(self, data, next=None):
self.data = data
self.next = next
# Note: use the attributes directly; no setters or getters!
class LList(object):
def __init__(self):
self._size = 0
self._head = None
self._tail = None
def set_data_at_index(self, idx, val):
"""
The value stored at index idx changes to val
return True if the index was valid otherwise return False
"""
if not 0<=id<self._size:
return False
itr = self._head
for i in range(idx):
itr = itr.next
itr.data = val
return True
def insert_value_at_index(self, val, idx):
"""
The list increases in size.
The new value is at index idx.
The values previously in the list at idx or later appear after the new value.
return If the index is valid, insert_value_at_index returns True.
return If the index is not valid, insert_value_at_index returns False.
"""
if not 0<=idx<self._size:
return False
if idx==0:
tmp = self._head
self._head = node(val, tmp)
self._size += 1
return True
itr = self._head
for i in range(idx-1):
itr = itr.next
tmp = node(val, itr.next)
itr.next = tmp
self._size += 1
return True
def delete_item_at_index(self, idx):
"""
The list decreases in size if the index is valid
The value at idx is no longer in the list.
return True if index was valid otherwise return False
"""
if not 0<=idx<self._size:
return False
if idx==0:
tmp = self._head
self._head = tmp.next
del tmp
self._size -= 1
return True
itr = self._head
for i in range(idx-1):
itr = itr.next
tmp = itr.next
itr.next = tmp.next
del tmp
if idx == self._size - 1:
self._last = itr
self._size -= 1
return True
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""" Add_to_front(self, val) and add_to_back(self, val) functions can be used which are already done in python...
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