CSE 214 Computer Science II Final Review II

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1 CSE 214 Computer Science II Final Review II Fall 2017 Stony Brook University Instructor: Shebuti Rayana

2 Linked List Problems Finding output Input List: void method1(node node) { if(node == NULL) return; method1(node.next); System.out.print(node.data); list.method1(list.head); Output: Shebuti Rayana (CS, Stony Brook University) 2

3 Linked List Problems Finding Output Input List: void method2(node head) { if(head== null) return; System.out.println(head.data); if(head.next!= null ) method2(head.next.next); System.out.println(head.data); list.method2(list.head); Output: Shebuti Rayana (CS, Stony Brook University) 3

4 Linked List Problems Given a sorted linked list, write a method removeduplicate() to delete all duplicates such that each element appears only once. For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3. Shebuti Rayana (CS, Stony Brook University) 4

5 Solution public Node removeduplicate(node head) { Node current = head; while (current!= null && current.next!= null) { if (current.next.data == current.data) { current.next = current.next.next; else { current = current.next; return head; Shebuti Rayana (CS, Stony Brook University) 5

6 Linked List Problems Given an unsorted linked list, write a method sortlist(node head) to sort the linked list. We are using insertion sort here 1) Create an empty sorted (or result) list 2) Traverse the given list, do following for every node.... a) Insert current node in sorted way in sorted or result list. 3) Change head of given linked list to head of sorted (or result) list. Shebuti Rayana (CS, Stony Brook University) 6

7 Solution public static Node sortlist(node head) { Node sorted = null; Node current = head; while(current!= null){ Node next = current.next; if(sorted == null sorted.data >= current.data){ current.next = sorted; sorted = current; else{ Node temp = sorted; while(temp.next!= null && temp.next.data < current.data) temp = temp.next; current.next = temp.next; temp.next = current; current = next; return sorted; Shebuti Rayana (CS, Stony Brook University) 7

8 Linked List Problems Complete the following method of a linked list for which you know the reference to the head node only. This method finds the middle node and set this middle node as the head of the list (remove middle and insert it at the head). public void setmiddletohead(){ if(head == null) return; Node slow_ref = head; // traverse by one Node fast_ref = head; // traverse by skipping one Node prev = null; // keep track of previous of middle while(fast_ref!= null && fast_ref.next!= null){ ; ; ; ; ; head = slow_ref; Shebuti Rayana (CS, Stony Brook University) 8

9 Linked List Problems Complete the following method of a linked list for which you know the reference to the head node only. This method finds the middle node and set this middle node as the head of the list (remove middle and insert it at the head). public void setmiddletohead(){ if(head == null) return; Node slow_ref = head; // traverse by one Node fast_ref = head; // traverse by skipping one Node prev = null; // keep track of previous of middle while(fast_ref!= null && fast_ref.next!= null){ prev = slow_ref; slow_ref = slow_ref.next; fast_ref = fast_ref.next.next; prev.next = slow_ref.next; slow_ref.next = head; head = slow_ref; Shebuti Rayana (CS, Stony Brook University) 9

10 Stack and Queue Problem Implement a stack using a single queue. Specifically, write pseudocode for push and pop operations on a stack using enqueue and dequeue operations of queue. Consider the queue class is given to you. What is the time complexity of these push and pop operations? We will use a single queue q. Consider the front of the queue is the top of the stack push(x) s = q.size() q.enqueue(x) for(int i = 0; i < s; i++) q.enqueue(q.dequeue()) pop() if q.isempty() Exception return q.dequeue() Shebuti Rayana (CS, Stony Brook University) 10

11 Stack and Queue Problem Implement a queue using two stacks. Specifically, write pseudocode for enqueue and dequeue operations on a queue using push and pop operations of stack. Consider the stack class is given to you. What is the time complexity of these enqueue and dequeue operations? We will use stack1 which will hold the elements of queue and stack2 as helper stack. Top of stack1 is front of the queue and stack1 bottom is the back of the queue enqueue(x) 1) While stack1 is not empty, push everything from satck1 to stack2. 2) Push x to stack1. 3) Push everything back to stack1 from stack2. dequeue() 1) If stack1 is empty then error 2) Pop an item from stack1 and return it Shebuti Rayana (CS, Stony Brook University) 11

12 Stack Problem Write a method utilizing your knowledge of the stack data structure that takes an integer value n and prints out the binary representation of the integer n. public static void tobinary(int n){ Stack s; while(n > 0){ s.push(n%2); n = n/2; while(!s.isempty()) System.out.print(s.pop()); Shebuti Rayana (CS, Stony Brook University) 12

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