Algorithm to swap two nodes in singly linked list:

The algorithm to swap two nodes “x” and “y” in singly linked list “L” is given below:

Algorithm:

Input: Two nodes “x” and “y”.

Output: Swap the two nodes in singly linked list “L”.

swapSingly(x, y):

//Create a node to assign the head into it

Node n = head;

/Loop executes until the next node of head is not equal to "x" node. /

while(n.getNext() != x)

/Get next node of head and assign it into "n" node. /

n = n.getNext();

/Get the next node of "y" node and assign it into "v" node. /

Node v = y.getNext();

/Call setNext() method to set the next node as "y" node by using "n"./

n.setNext(y);

/Call setNext() method to set the next node as "x" node by using "y". /

y.setNext(x);

/Call setNext() method to set the next node as "v" node by using "x". /

x.setNext(v);

Explanation:

In the above algorithm,

This method accepts two input parameters such as “x” and “y”.

Create new node “n” and “v” to hold nodes “x” and “y” from singly linked lists.

The while loop executes until the next node of head is not equal to “x” node.

Get next node of head and assign it into “n” node.

Get the next node of “y” node and assign it into “v” node.

Call setNext() method to set the next node as “y” node by using “n”.

Call setNext() method to set the next node as “x” node by using “y”.

Call setNext() method to set the next node as “v” node by using “x”.

Finally, the two nodes “x” and “y” are swapped in singly linked list.

Algorithm to swap two nodes in doubly linked list:

The algorithm to swap two nodes “x” and “y” in singly linked list “L” is given below:

Algorithm:

Input: Two nodes “x” and “y”.

Output: Swap the two nodes in doubly linked list “L”.

swapDoubly(x, y):

/*Create a node to assign the previous node of "x" node into it...

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Chapter 3, Problem 26C

Chapter 3, Problem 28C

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Chapter 3 Solutions

Data Structures and Algorithms in Java

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