Write a program in Java to manipulate a Double Linked List:   Count the number of nodes Insert a new node before the value 7 of Double Linked List Search an existing element in a Double linked list (the element of search is given by the user) Suppose List contained the following Test Data: Input the number of nodes : 4 Input data for node 1 : 5 Input data for node 2 : 6 Input data for node 3 : 7 Input data for node 4: 9

A(n) array can be used in an array implementation of a queue to avoid an overflow error at the rear of the queue when the queue is not full.

Python data structures: write a function that takes in a list (L) as input, and returns the number of inversions. An inversion in L is a pair of elements x and y such that x appears before y in L, but x > y. Your function must run in -place and implement the best possible algoritm of time complexity.  def inversions(L: List) -> int:'''finds and returns number of inversions'''

Assume a linked list contains following integers: 5, 2, 4, 6, 8, 3, 15 and the pointer head is pointing to the first node of the list. What will be the value of variable a after the following statements are executed: Node<int> *curNode=head; int a=0; while(curNode!=NULL){      a+=curNode->getItem();       curNode=curNode->getNext();       if(curNode!=NULL)            curNode=curNode->getNext(); } A.32 B.43 C.19 D.18

Assume a linked list contains following integers: 2, 2, 4, 5, 8, 3, 15 and the pointer head is pointing to the first node of the list. What will be the value of variable a after the following statements are executed: Node<int> *curNode=head; int a=0; Node<int> *aNode; while(curNode->getItem()<7){        aNode=curNode;        curNode=curNode->getNext(); } a=aNode->getItem();   A. 5 B.8 C.0 D.7

This program will use an array implementation of a linked list to keep an ascending sorted list of numbers. The input data consists of two fields: a single character and an integer value. The single character gets interpreted as one of the following: A - represents a value that is to be added to the linked listD - represents a value to be deleted from the linked listP - indicates that all values are to be printed in ascending order The character is only used to determine which process is to be executed; it should not be printed, entered into the linked list, or processed in any way. The main program should be mainly function calls. Process input data until end of file. All output should be sent to an output file and be appropriately formatted and labeled. Keep a running log of everything that is going on in the processing. Input file: A 54A -17A 32 A 81 A -30 A 18 P A 41 A 93 A 65 A 80 A 104 A -20 D 81 D 54 D -30 A 79 A 63 A 77 A –33 D 104 D -20 D 80 D 32 P

Code in Python: