The document provides a detailed request for assistance in implementing a priority queue data structure using a linked list in C++, while incorporating templates. It outlines specific methods needed for the code to work with a provided test script and includes code snippets for stacks, queues, and priority queues. Additionally, there are instructions for decimating elements within a queue and modifying the code with informative comments.

1. I need help with implementing the priority queue data structure with a linked list implementation
and with modifying my code with a template. Make sure that the code has the required methods
to get the given test code in driver.cpp to work properly. I will provide the main cpp file and
what I have so far below. The code is in C++. Add comments to where you modified the code, so
I know what you did to change it. Thank you.
//////////////////////// driver.cpp /////////////////////////////
#include <iostream>
#include <string>
#include "stackLL.h"
#include "queueLL.h"
#include "priorityQueueLL.h"
using namespace std;
int main()
{
/////////////Test code for stack ///////////////
stackLL stk;
stk.push(5);
stk.push(13);
stk.push(7);
stk.push(3);
stk.push(2);
stk.push(11);
cout << "Popping: " << stk.pop() << endl;
cout << "Popping: " << stk.pop() << endl;
stk.push(17);
stk.push(19);
stk.push(23);
while (!stk.empty())
{
cout << "Popping: " << stk.pop() << endl;
}
// output order: 11,2,23,19,17,3,7,13,5
stackLL stkx;

2. stkx.push(5);
stkx.push(10);
stkx.push(15);
stkx.push(20);
stkx.push(25);
stkx.push(30);
stkx.insertAt(-100, 3);
stkx.insertAt(-200, 7);
stkx.insertAt(-300, 0);
//output order: -300,30,25,20,-100,15,10,5,-200
while (!stkx.empty())
cout << "Popping: " << stkx.pop() << endl;
///////////////////////////////////////
//////////Test code for queue ///////////
queueLL Q;
Q.enqueue(1);
Q.enqueue(2);
Q.enqueue(3);
cout << "Dequeuing: " << Q.dequeue() << endl; //1
cout << "Dequeuing: " << Q.dequeue() << endl; //2
Q.enqueue(4);
Q.enqueue(5);
//3 4 5
while (!Q.empty())
{
cout << "Dequeuing: " << Q.dequeue() << endl;
}
/////////////////////////////////////////
//////////Test code for priority queue/////
priorityQueueLL<int> pQueue;
const int SIZE = 20;
//insert a bunch of random numbers
for (int i = 0; i < SIZE; i++)

3. {
pQueue.insert(rand());
}
//pull them back out..
//They must come out in order from smallest to largest
while (!pQueue.empty())
{
cout << pQueue.extractMin() << endl;
}
priorityQueueLL<string> pqs;
pqs.insert("whale");
pqs.insert("snake");
pqs.insert("buffalo");
pqs.insert("elmo");
pqs.insert("fire");
pqs.insert("waffle");
//buffalo elmo fire snake waffle whale
while (!pqs.empty())
{
cout << pqs.extractMin() << endl;
}
///////////////////////////////////////////
//1) Template your queue class
//2) Add a decimate method to your queue class
queueLL<int> qx;
for (int i = 1; i <= 100; i++)
qx.enqueue(i);
//Eliminate every 10th item from list
//https://en.wikipedia.org/wiki/Decimation_(punishment)
qx.decimate();
//1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22... 98 99
while (!qx.empty())
cout << qx.dequeue() << endl;
queueLL<string> qy;
qy.enqueue("sparticus");

4. qy.enqueue("maximus");
qy.enqueue("killicus");
qy.enqueue("awesomeicus");
qy.enqueue("gannicus");
qy.enqueue("varro");
qy.enqueue("oenomous");
qy.enqueue("slayicus");
qy.enqueue("bladeicus");
qy.enqueue("ted");
qy.enqueue("smashicus");
qy.enqueue("mallicus");
qy.enqueue("wussicus");
qy.enqueue("wimpicus");
qy.enqueue("crixus");
qy.decimate();
//Everyone but Ted.
while (!qy.empty())
cout << qy.dequeue() << endl;
return 0;
}
//////////////////////// queueLL.h ///////////////////////////
#ifndef QUEUELL_H
#define QUEUELL_H
class queueLL
{
private:
//put what you need here...
public:
queueLL()
{}
~queueLL()
{}
//return true if empty, false if not
bool empty()
{}

5. //add item to back of queue
void enqueue(int x)
{}
//remove and return first item from queue
int dequeue()
{}
//For the final part of the test program, template this class
//and add a decimate method.
};
#endif
///////////////////////// queueLL.cpp //////////////////////////
#include "queueLL.h"
#include<iostream>
using namespace std;
class queueLL
{
private:
class node
{
public:
int data;
node* next;
node(int d, node* n = nullptr) : data(d), next(n) {}
};
node* head;
node* tail;
public:
queueLL() : head(nullptr), tail(nullptr) {}
~queueLL()
{
while (!empty())
{
dequeue();
}
}
bool empty()
{

6. return head == nullptr;
}
void enqueue(int x)
{
node* new_tail = new node(x);
if (empty())
{
head = new_tail;
}
else
{
tail->next = new_tail;
}
tail = new_tail;
}
int dequeue()
{
if (empty())
{
throw std::out_of_range("Queue is empty");
}
int ret = head->data;
node* old_head = head;
head = head->next;
if (head == nullptr)
{
tail = nullptr;
}
delete old_head;
return ret;
}
void decimate()
{
node* current = head;
node* prev = nullptr;
int i = 1;
while (current != nullptr)
{
if (i % 10 == 0)
{
if (prev == nullptr)
{
head = current->next;

7. }
else
{
prev->next = current->next;
}
node* next = current->next;
delete current;
current = next;
}
else
{
prev = current;
current = current->next;
}
++i;
}
tail = prev;
}
};
//////////////////////////// priorityQueueLL.h /////////////////////////////////
#ifndef PRIORITYQUEUELL_H
#define PRIORITYQUEUELL_H
template <class T>
class priorityQueueLL
{
private:
class node
{
public:
//put what you need here..
}
//add what you wish here
public:
priorityQueueLL()
{}
~priorityQueueLL()
{}

8. //return true if empty, false if not
bool empty()
{}
//add item
void insert(T x)
{}
//remove and return smallest item
T extractMin()
{}
};
#endif
///////////////////////////// priorityQueueLL.cpp ////////////////////////////////////
#include "priorityQueueLL.h"
#include<iostream>
using namespace std;
template <typename T>
class PriorityQueueLL {
private:
struct Node {
T data;
int priority;
Node* next;
Node(T d, int p) : data(d), priority(p), next(nullptr) {}
};
Node* head;
public:
PriorityQueueLL() : head(nullptr) {}
~PriorityQueueLL() {
while (head) {
Node* temp = head;
head = head->next;
delete temp;
}
}
void push(T data, int priority) {
Node* newNode = new Node(data, priority);
if (!head || priority > head->priority) {
newNode->next = head;

9. head = newNode;
}
else {
Node* curr = head;
while (curr->next && priority <= curr->next->priority) {
curr = curr->next;
}
newNode->next = curr->next;
curr->next = newNode;
}
}
void pop() {
if (!head) {
throw std::out_of_range("Priority queue is empty");
}
Node* temp = head;
head = head->next;
delete temp;
}
T top() const {
if (!head) {
throw std::out_of_range("Priority queue is empty");
}
return head->data;
}
bool empty() const {
return head == nullptr;
}
};