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38 changes: 38 additions & 0 deletions data_structures/linked_list/remove_nth_node_from_end.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
class Node:
def __init__(self, val):
self.val = val
self.next = None


def remove(head, n):
extra = Node(0)
extra.next = head
fast = extra
slow = extra
for _ in range(n):
fast = fast.next

while fast.next:
fast = fast.next
slow = slow.next

slow.next = slow.next.next

return extra.next


def print_list(head):
curr = head
while curr:
print(curr.val, end=" ")
curr = curr.next


head = Node(1)
head.next = Node(2)
head.next.next = Node(3)
head.next.next.next = Node(4)
head.next.next.next.next = Node(5)
print_list(head)
head = remove(head, 5)
print_list(head)