09. linked 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

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Operations of Linked List

A linked lists are one of the most widely used and effective data structures, with applications in every programming language, including C, C++, Python, Java, and C#.