Answered: uld use only constant space. You may…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Alinked list, swap every two adjacent nodes
and return its head.

For example,
Given 1->2->3->4, you should return the list as 2->1->4->3.

Your algorithm should use only constant space.
You may not modify the values in the list,
only nodes itself can be changed.
"""
class Node(object):
def __init__(self, x):
self.val = x
self.next = None

def swap_pairs(head):
if not head:
return head
start = Node(0)
start.next = head
current = start
while current.next and current.next.next:
first = current.next.

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