The following method is intended to pop an item from the top of an Integer stack that is implemented as a linked list. However, there is a problem with it. Explain the problem and write the code for the correct implementation. public Integer pop () { if (top != null) { top = top.next; return top.value; return null;
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- Implement a stack with a single queue so that each stackoperations takes a linear number of queue operations. Hint : To delete an item, get allof the elements on the queue one at a time, and put them at the end, except for the lastone which you should delete and return. (In java how do you: Delete the lowest/smallest item from the Circular Linked List (provided the list is sorted in ascending order) Reverse a Stack S, using a Queue Q Add the top 2 elements of a Stack S. Return the addition and push the data back in the stack S. How to reverse a Queue using a Stack? How to reverse a Queue using an array?What is the time complexity for efficiently removing m items from a stack with n size that is implemented as a linked list (m < n)?
- Please Use Java language Write a method “mergeQueueStack” that takes a queue as a parameter of type: Queue of integers and a stack as a second parameter of type: Deque of integers Remove all the items from the queue and remove all the items from the stack then add them to a LinkedList by alternating between an item from queue then an item from stack. Don’t assume initially both the queue and the stack have the same number of items. The method should return the linked list of type integers. Example: If queue has : 1,2,3,4,5 and stack has 10, 20, 30 (where 10 is at top of the stack) then the linkedList should contain: 1,10,2,20,3,30,4,5Implement a queue with three stacks so that, in the worst-case scenario, each queue operation requires a fixed number of stack operations. High level of difficulty alert.The calculator works as follows: if number, push to a stack if operator, pop two numbers, operate on them, and push the result if I hit an operator and there are not two numbers on the stack, it's a bad expression if I get to the end of the expression and there is not exactly one number on the stack, it's a bad expression. YOUR IMPLEMENTATION, 30 points: 10 - the input to output happening without a crash 10 for implementing LinkedListBasedStack 10 for implementing ArrayList YOUR CALCULATOR ONLY NEEDS TO WORK FOR +, -, and * YOUR CALCULATOR ONLY NEEDS TO WORK ON INTEGERS. RPNStringTokenizer.java package template; import java.util.ArrayList; public interface RPNStringTokenizer { public static ArrayList<String> tokenize (String expression) { // take a string. If it is valid RPN stuff - integers or operators // - then put them in a list for processing. // anything bad (not int or one of the operators we like) and return a null. // YOU WRITE THIS! return null; } }…
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- The implementation of a queue in an array, as given in this chapter, uses the variable count to determine whether the queue is empty or full. You can also use the variable count to return the number of elements in the queue. On the other hand, class linkedQueueType does not use such a variable to keep track of the number of elements in the queue. Redefine the class linkedQueueType by adding the variable count to keep track of the number of elements in the queue. Modify the definitions of the functions addQueue and deleteQueue as necessary. Add the function queueCount to return the number of elements in the queue. Also, write a program to test various operations of the class you defined.Write a Python program that creates a linked list with 10000 nodes. Each node has arandom number between -1000 and 1000. Write a Python program that sort the linked list of above question in ascending order using theinsertion sort.Implement a queue Q with two stacks S1 and S2 so that the stacks that work together as a queue may perform operations ENQUEUE(Q, X) and DEQUEUE(Q, Y), where Q is apparently a queue and X is the element to be inserted into Q and Y is the element removed from Q. Assume that the PUSH, POP, and EMPTYSTACK ADT operations are only accessible for stacks.Demonstrate the operation of your method on a list a, b, c, which will be used as a queue by the stacks S1 and S2.