Untitled

class Node:
    def __init__(self, data=None):
        self.data = data
        self.next = None

class LinkedList:
    def __init__(self):
        self.head = None

    def append(self, data):
        new_node = Node(data)

        if self.head is None:
            self.head = new_node
        else:
            current = self.head
            while current.next:
                current = current.next
            current.next = new_node

    def remove_duplicates(self):
        if self.head is None:
            return

        current = self.head
        while current:
            next_node = current.next
            if next_node and next_node.data == current.data:
                current.next = next_node.next
            else:
                current = current.next

    def to_list(self):
        result = []
        current = self.head
        while current:
            result.append(current.data)
            current = current.next
        return result

# Ví dụ sử dụng
L = LinkedList()
L.append(1)
L.append(1)
L.append(2)
L.append(2)
L.append(3)
L.append(4)
L.append(4)
L.append(4)
L.append(5)
L.append(5)

print("Danh sách ban đầu:", L.to_list())

L.remove_duplicates()

print("Danh sách sau khi loại bỏ phần tử trùng lặp:", L.to_list())