Скачать или смотреть L -91 Pairwise swap nodes of Linked List | Java DSA Placement | FAANG

Problem Statement:
Given a singly linked list of size N. The task is to swap elements in the linked list pairwise.
For example, if the input list is 1 2 3 4, the resulting list after swaps will be 2 1 4 3.
Note: You need to swap the nodes, not only the data. If only data is swapped then driver will print -1.

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