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The pop operation in a linked list removes the head (first) node and returns its value. This is an O(1) operation since it only involves updating the head pointer.
Example:
# Node definitionclass Node:def __init__(self, data=None, next=None):self.data = dataself.next = next# Helper to print the linked listdef print_list(head):ptr = headwhile ptr:print(ptr.data, end=" -> ")ptr = ptr.nextprint("None")# Pop function: removes head and returns new headdef pop(head):if head is None: # Underflow conditionreturn None, Nonepopped_value = head.datahead = head.next # Move head to next nodereturn popped_value, head# Example usageif __name__ == "__main__":# Create linked list: 1 -> 2 -> 3 -> 4 -> Nonehead = Nonefor i in reversed(range(1, 5)):head = Node(i, head)print("Original list:")print_list(head)value, head = pop(head)print(f"Popped value: {value}")print("After pop:")print_list(head)Copied!✕CopyHow it works:
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