Topic: Singly Linked ListImplement the following functions in C++ program. Read the question carefully. Below is the "CODE THAT NEEDS TO BE IMPROVED" or "NOT FINAL CODE"  (See attached photo for reference)  bool addAt(int num, int pos) This method will add the integer num to the posth position of the list and returns true if the value of pos is valid. Performing addAt(20, 2) in the example list will add 20 at the 2nd position and the linked list will now look like this: 10 -> 20 -> 30 -> 40 -> 50. When the value of pos is invalid i.e. greater than the size + 1 or less than one, return false.   bool addAt(int num, int pos) {             if (pos == 1) { // case 1: addHead                 addHead(num);                 return true;             }             if (pos == index + 1) { // case 3: addTail                 addTail(num);                 return true;             }             node* currnode = head; //addAt(20, 3)             int count = 0;             while (currnode…

(Q5) This is a Data Structures problem and the programming language used is Lisp. Solve the question we detailed steps and make it concise and easy to understand. Please and thank you.

C++ PROGRAMMING (Linked list) complete the functions: You have to continue on implementing your Array List namely the following functions: Example ArrayList: [10, 30, 40, 50] void addAt(int num, int pos) This method will add the integer num to the posth position of the list. Performing addAt(20, 2) in the example list will add 20 at the 2nd position and the array will now look like this: [10, 20, 30, 40, 50] When the value of pos is greater than the size + 1 or less than one, output "Position value invalid" void removeAt(int pos) Removes the number in the posth position of the list. Performing removeAt(3) in the example list will remove the 3rd element of the list and the updated array will be: [10, 30, 50] When the value of pos is greater than the size or less than one, output "Position value invalid"   My incomplete code:   #include <cstdlib>#include <iostream>using namespace std; class ArrayList : public List { // : means "is-a" / extend    int* array;    int index;…