EE2204 Data Structures and Algorithm QBrogh

7/31/2019 EE2204 Data Structures and Algorithm QBrogh

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EE2204 DATA STRUCTURES AND ALGORITHMS 3 0 0 3

Unit 1

Part a

1. What is meant by an abstract data type?

An ADT is a set of operation. Abstract data types are mathematical

abstractions.Eg.Objects such as list, set and graph along their operations can be

viewed as ADTs.

2. What are the operations of ADT?

Union, Intersection, size, complement and find are the various operations of

ADT.

3. What is meant by list ADT?

List ADT is a sequential storage structure. General list of the form a1, a2,

a3.., an and the size of the list is n. Any element in the list at the position I is

defined to be ai, ai+1 the successor of ai and ai-1 is the predecessor of ai.

4. What are the various operations done under list ADT?

a. Print list

b.Insert

c.Make empty

d.Remove

e.Next

f.Previous

g.Find kth

5. What are the different ways to implement list?

a. Simple array implementation of list

b.Linked list implementation of list

6. What are the advantages in the array implementation of list?a. Print list operation can be carried out at the linear time

b. Find Kth operation takes a constant time7. What is a linked list?

Linked list is a kind of series of data structures, which are not necessarily

adjacent in memory. Each structure contains the element and a pointer to a record

containing its successor.


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8. What is a pointer?

Pointer is a variable, which stores the address of the next element in the list.

Pointer is basically a number.

9. What is a doubly linked list?

In a simple linked list, there will be one pointer named as NEXT

POINTER to point the next element, where as in a doubly linked list, there will be

two pointers one to point the next element and the other to point the previous

element location.

10. Define double circularly linked list?

In a doubly linked list, if the last node or pointer of the list, point to the first

element of the list, then it is a circularly linked list.

11. What is the need for the header?

Header of the linked list is the first element in the list and it stores the

number of elements in the list. It points to the first data element of the list.

12. List three examples that uses linked list?

a. Polynomial ADT

b.Radix sort

c.Multi lists

13. Give some examples for linear data structures?

a. Stack

b.Queue

14. What is a stack?

Stack is a data structure in which both insertion and deletion occur at one

end only. Stack is maintained with a single pointer to the top of the list of

elements. The other name of stack is Last-in -First-out list.

15. Write postfix from of the expression A+B-C+D?

A-B+C-D+

16. How do you test for an empty queue?

To test for an empty queue, we have to check whether READ=HEAD

where REAR is a pointer pointing to the last node in a queue and HEAD is a

pointer that pointer to the dummy header. In the case of array implementation of

queue, the condition to be checked for an empty queue is READ


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17.What are the postfix and prefix forms of the expression?

A+B*(C-D)/(P-R)

Postfix form: ABCD-*PR-/+

Prefix form: +A/*B-CD-PR

18. Explain the usage of stack in recursive algorithm implementation?

In recursive algorithms, stack data structures is used to store the return

address when a recursive call is encountered and also to store the values of all the

parameters essential to the current state of the procedure.

19. Write down the operations that can be done with queue data structure?

Queue is a first in -first out list. The operations that can be done with

queue are addition and deletion.

20. What is a circular queue?

The queue, which wraps around upon reaching the end of the array is called

as circular queue.

Unit 1 part B

1. Explain the linked list implementation of list ADT in Detail?a. Definition for linked list

b. Figure for linked list

c. Next pointerd. Header or dummy node

e. various operations

f. Explanation

g. Example figure

h. Coding

2. Explain the cursor implementation of linked list?a. Definition for linked list

b. Figure for linked list

c. Next pointerd. Header or dummy node

e. various operations

f.Explanation

g.Example figure

h.Coding

3. Explain the various applications of linked list?


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a. Polynomial ADT

Operations

Coding

Figure

b. Radix SortExplanation

Example

c. Multilist

Explanation

Example figure

4. Explain the linked list implementation of stack ADT in detail?a. Definition for stack

b. Stack model

c.Figured.Pointer-Top

e.Operations

f.Coding

g.Example figure

5. Explain the array implementation of queue ADT in detail?a. Definition for stack

b. Stack model

c. Figure

d. Pointer-FRONT, REAR

e. Operations

f.Coding

g.Example figure

Unit 2& 3

Part A

1. Define non-linear data structure

Data structure which is capable of expressing more complex relationship

than that of physical adjacency is called non-linear data structure.

2. Define tree?


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A tree is a data structure, which represents hierarchical relationship between

individual data items.

3. Define leaf?

In a directed tree any node which has out degree o is called a terminal node

or a leaf.

4. What is meant by directed tree?

Directed tree is an acyclic diagraph which has one node called its root with

in degree o while all other nodes have in degree I.

5. What is a ordered tree?

In a directed tree if the ordering of the nodes at each level is prescribed then

such a tree is called ordered tree.

6. What are the applications of binary tree?

Binary tree is used in data processing.

a. File index schemes

b. Hierarchical database management system

7. What is meant by traversing?

Traversing a tree means processing it in such a way, that each node is

visited only once.

8. What are the different types of traversing?

The different types of traversing are

a. Pre-order traversal-yields prefix from of expression.

b. In-order traversal-yields infix form of expression.

c. Post-order traversal-yields postfix from of expression.

9. What are the two methods of binary tree implementation?

Two methods to implement a binary tree are,

a. Linear representation.

b. Linked representation

10. Define pre-order traversal?

Pre-order traversal entails the following steps;

a. Process the root node

b. Process the left subtree

c. Process the right subtree

11.Define post-order traversal?


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Post order traversal entails the following steps;

a. Process the left subtree

b. Process the right subtree

c. Process the root node

12. Define in -order traversal?

In-order traversal entails the following steps;

a. Process the left subtree

b. Process the root node

c. Process the right subtree

13. What is a balance factor in AVL trees?

Balance factor of a node is defined to be the difference between the height

of the node's left subtree and the height of the node's right subtree.

14. What is meant by pivot node?

The node to be inserted travel down the appropriate branch track along the

way of the deepest level node on the branch that has a balance factor of +1 or -1 is

called pivot node.

15. What is the length of the path in a tree?

The length of the path is the number of edges on the path. In a tree there is

exactly one path form the root to each node.

16. Define expression trees?

The leaves of an expression tree are operands such as constants or variable

names and the other nodes contain operators.

17. What is the need for hashing?

Hashing is used to perform insertions, deletions and find in constant

average time.

18. Define hash function?

Hash function takes an identifier and computes the address of that identifier

in the hash table using some function.19. List out the different types of hashing functions?

The different types of hashing functions are,

a. The division method

b. The mind square method

c. The folding method


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d. Multiplicative hashing

e. Digit analysis

20. What are the problems in hashing?a. Collision

b. Overflow

21. What are the problems in hashing?

When two keys compute in to the same location or address in the hash table

through any of the hashing function then it is termed collision.

Unit 2 and 3 part B

1. Explain the different tree traversals with an application?a. In order

Explanation with an exampleFigure

b. Preorder

Explanation with an example

Figure

c. Post order

Explanation with an example

Figure

2. Define binary search tree? Explain the various operations with an example?

a. Definitionb. Figure for binary search tree

c. Operations

d.Codings

e.Explanation

f.Example

3. Define AVL trees? Explain the LL, RR, RL, LR case with an example?a. Definition

b. LL, RR, RL, LR case

c.Figure

d.Example

e.Explanation

4. Define priority queue? Explain the basic heap operation with an example?a. Definition

b. Basic operation

Insert


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Delmin

Delmax

c. Coding

d. Explanation

e.Example5. Explain any two techniques to overcome hash collision?a. Separate chaining

Example

Explanation

coding

b. Open addressing

Linear probing

Quadratic probing

Unit 4

Part A

1. Define Graph?

A graph G consist of a nonempty set V which is a set of nodes of the graph,

a set E which is the set of edges of the graph, and a mapping from the set for edge

E to a set of pairs of elements of V. It can also be represented as G=(V, E).

2. Define adjacent nodes?

Any two nodes which are connected by an edge in a graph are called

adjacent nodes. For E is associated with a pair of nodesexample, if and edge x

(u,v) where u, v V, then we say that the edge x connects the nodes u and v.

3. What is a directed graph?

A graph in which every edge is directed is called a directed graph.

4. What is a undirected graph?

A graph in which every edge is undirected is called a directed graph.5. What is a loop?

An edge of a graph which connects to itself is called a loop or sling.

6. What is a simple graph?


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A simple graph is a graph, which has not more than one edge between a

pair of nodes than such a graph is called a simple graph.

7. What is a weighted graph?

A graph in which weights are assigned to every edge is called a weighted

graph.

8. Define out degree of a graph?

In a directed graph, for any node v, the number of edges which have v as

their initial node is called the out degree of the node v.

9. Define indegree of a graph?

In a directed graph, for any node v, the number of edges which have v as

their terminal node is called the indegree of the node v.

10. Define path in a graph?

The path in a graph is the route taken to reach terminal node from a starting

node.

11. What is a simple path?

A path in a diagram in which the edges are distinct is called a simple path.

It is also called as edge simple.

12. What is a cycle or a circuit?

A path which originates and ends in the same node is called a cycle or

circuit.

13. What is an acyclic graph?

A simple diagram which does not have any cycles is called an acyclic

graph.

14. What is meant by strongly connected in a graph?

An undirected graph is connected, if there is a path from every vertex to

every other vertex. A directed graph with this property is called stronglyconnected.

15. When is a graph said to be weakly connected?

When a directed graph is not strongly connected but the underlying graph is

connected, then the graph is said to be weakly connected.

16. Name the different ways of representing a graph?


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a. Adjacency matrix

b. Adjacency list

17. What is an undirected acyclic graph?

When every edge in an acyclic graph is undirected, it is called an undirected

acyclic graph. It is also called as undirected forest.

18. What are the two traversal strategies used in traversing a graph?

a. Breadth first search

b. Depth first search

19. What is a minimum spanning tree?

A minimum spanning tree of an undirected graph G is a tree formed from

graph edges that connects all the vertices of G at the lowest total cost.

20. What is NP?

NP is the class of decision problems for which a given proposed solution

for a given input can be checked quickly to see if it is really a solution.

Unit 4 part B

1. Explain the various representation of graph with example in detail?a. Adjacency matrix

Figure

Explanation

Table

b. Adjacency list

Figure

Explanation

Table

2. Define topological sort? Explain with an example?a. Definition

b. Explanation

c. Example

d. Tablee. Coding

3. Explain Dijkstra's algorithm with an example?a. Explanation

b. Example

c. Graph

d. Table


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e. coding

4.Explain Prim's algorithm with an example?a. Explanation

b. Example

c. Graph

d. Table

e. Coding

5. Explain Krushal's algorithm with an example?a. Explanation

b. Example

c. Graph

d. Table

e. Coding

Unit V

Part A

1. Write down the definition of data structures?

A data structure is a mathematical or logical way of organizing data in the

memory that consider not only the items stored but also the relationship to each

other and also it is characterized by accessing functions.

2. What is meant by problem solving?

Problem solving is a creative process, which needs systemization and

mechanization.

3. Give few examples for data structures?

Stacks, Queue, Linked list, Trees, graphs

4. What is problem definition phase?

The first step in solving a problem is to understand problem clearly. Hence,

the first phase is the problem definition phase. That is, to extract the task from the

problem statement. If the problem is not understood, then the solution will not be

correct and it may result in wastage of time and effort.

5. Define Algorithm?

Algorithm is a solution to a problem independent of programming

language. It consist of set of finite steps which, when carried out for a given set of


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inputs, produce the corresponding output and terminate in a finite time.

6. Define Program?

Set of instructions to find the solution to a problem. It is expressed in a

programming language in an explicit and unambiguous manner.

7. Mention how similarities among the problems are used in problem solving?

This method is used to find out if a problem of this sort has been already

solved and to adopt a similar method in solving the problem. The contribution of

experience in the previous problem with help and enhance the method of problem

for the current problem.

8. What is working backward from the solution?

When we have a solution to the problem then we have to work backward to

find the starting condition. Even a guess can take us to the starting of the problem.This is very important to systematize the investigation to avoid duplication of our

effort.

9. Mention some of the problem solving strategies?

The most widely strategies are listed below

Divide and conquer

Binary doubling strategy

Dynamic programming

10. What is divide and conquer method?

The basic idea is to divide the problem into several sub problems beyond

which cannot be further subdivided. Then solve the sub problems efficiently and

join then together to get the solution for the main problem.

11. What are the features of an efficient algorithm?a. Free of ambiguity

b.Efficient in execution time

c.Concise and compact

d.Completeness

e.Definiteness

f.Finiteness

12. List down any four applications of data structures? a. Compiler design

b.Operating System

c.Database Management system


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d.Network analysis

13. What is binary doubling strategy?

The reverse of binary doubling strategy, i.e. combining small problems in to

one is known as binary doubling strategy. This strategy is used to avoid the

generation of intermediate results.

14. Where is dynamic programming used?

Dynamic programming is used when the problem is to be solved in a

sequence of intermediate steps. It is particularly relevant for many optimization

problems, i.e. frequently encountered in Operations research.

15. Define top-down design?

Top-down design is a strategy that can be applied to find a solution to a

problem from a vague outline to precisely define the algorithm and programimplementation by stepwise refinement.

16. Mention the types of bugs that may arise in a program?

The different types of bugs that can arise in a program are

Syntactic error

Semantic error

Logical error

17. What is program testing?

Program testing is process to ensure that a program solves the smallestpossible problem, when all the variables have the same value, the biggest possible

problem, unusual cases etc.

18. What is program verification?

Program verification refers to the application of mathematical proof

techniques, to verify that the results obtained by the execution of the program with

arbitrary inputs are in accord with formally defined output Specifications.

19. How will you verify branches with segments?

To handle the branches that appear in the program segments, it is necessaryto set-up and proves verification conditions individually.

20. What is proof of termination?

To prove that a program accomplishes its stated objective in a finite number

of steps is called program termini nation. The prooft of termination is obtained

directly from the properties of the interactive constructs.


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Unit V part B

1. Explain top-down design in detail?

a. Definition

b.Breaking a problem in to sub problems

c.Choice of a suitable data structure

d.Constructions of loops

e.Establishing initial conditions for loops

f.Finding the iterative construct

g.Terminations of loops

2. What are the steps taken to improve the efficiency of an algorithm?

a. Definition

b.Redundant computations

c.Referencing array elements

d.Inefficiency due to late termination

e.Early detection of desired output conditions

f.Trading storage for efficiency gains

3. Design an algorithm fro sine function computation. Explain it with an

example?

a. Algorithm development

b.Algorithm description

c.Pascal implementation

d.Application

4. Design an algorithm for reversing the digit of an integer. Explain it with anexample?

a. Algorithm development

b.Algorithm description

c.Pascal implementation

d.Application

5. Design an algorithm for base conversion. Explain it with an example?Algorithm development

Algorithm description

Pascal implementation

Application


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B.E / B.Tech DEGREE EXAMINATION,MAY/JUNE 2006

THIRD SEMESTER

Computer Science and Engineering

CS1151 DATA STRUCTURES

PART A (10 X 2 = 20 marks)

1.Define ADT


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An ADT is a set of operation. Abstract data types are mathematical

abstractions.Eg.Objects such as list, set and graph along their operations can be

viewed as ADT's.

2.List out the operations of the list ADT? Insert an item, Delete an item, find, Display

3. Define dequeue.

A deque (short fordouble-ended queue) is an abstract data structure for

which elements can be added to or removed from the front or back. This differs

from a normal queue, where elements can only be added to one end and removed

from the other

4. Explain the representations of priority queue.

Using Heap structure, Using Linked List

1. Compare the various hashing techniques.1) Separate chaining Linked list implementation

2) Open Addressing- Array implementation

2. List out the steps involved in deleting a node from a binary search tree.1. t has no right hand child node t->r == z

2. t has a right hand child but its right hand child node has no left sub tree

t->r->l == z

3. t has a right hand child node and the right hand child node has a left hand

child node t->r->l != z

3. Explain the topological sort.It is an Ordering of vertices in a directed acyclic graph such that if there is a

path from vi to vj, then vj appears after vi in the ordering.

4. Define NP hard

NP is the class of decision problems for which a given proposed solutionfor a

given input can be checked quickly to see if it is really a solution.

5. What is binary heap


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It is a complete binary tree of height h has between 2h and 2h+1 -1 node. The value

of the root node is higher than their child nodes.

PART B (5 X 16 = 80 marks)

6. (i) Write algorithms for ADT operations for insert a node to linked list

To insert a new item after B:

1) Modify pointer field of NEW to point to C

2) Modify pointer field of B to point to NEW

NEWNODE->NEXT=B->NEXT;

B->NEXT=NEWNODE;

(ii) Write algorithm for delete a node from linked list

To delete an item coming after B,

1) Modify pointer field of B, to point to the node pointed by pointer of OLD


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2) Modify pointer field of OLD as ^ (not to cause problem later on)

B->NEXT=OLD->NEXT;

FREE(OLD);

12. (a) Write ADT routines for stack operation. Write routines for evaluating

a infix expression

A stack is a LIFO (Last-In/First-Out) data structure. Items are taken out of

the stack in the reverse order of their insertion. We can write an application that

evaluates an arithmetic expression using the LIFO storage policy of a stack. The

evaluation procedure consists of two parts: 1) converting an infix expression to the

postfix expression and 2) evaluating the postfix expression to get its value.

1. Infix notation vs. postfix notation

Infix notation

o A common mathematical notation is an infix notation.

o Binary operators, such as +, -, *, /, come in-between their operands.o Unary operators, such as (a unary negation), precede their operand.

o Example: A + B * C + D / E - A * C

Postfix notation

o Each operator appears after its operands

o Parenthesis-free notation

o Evaluation can be done by scanning an expression once from left to

right. Therefore, a postfix expression is easier for a calculator (or

computer) to process.

o Example: A B C * + D E / + A C * - Infix to postfix (paper and pencil)

1. Fully parenthesize the expression so that each operator has a pair of

parentheses surrounding its operands.

2. Move all operators so that they replace their corresponding right

parenthesis

3. Delete all parentheses.


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o push ( onto the stack and if ) is encountered, pop off only

operators that are within the pair of matching parentheses and never

pop operators that is below the (.

c) The postfix expression handles operators according to the precedence

rules: the higher precedence operator must be written first; operators ofequal precedence should be written from left to right.

o Example: 4 * 3 + 5 4 3 * 5 +; 4 + 3 * 5 4 3 5 * +; 2 + 3 5 2

3 + 5

o The current operator will be pushed onto the stack anyway because

we dont know if it has a higher precedence than the following

operator.

o Before pushing the current operator, pop off the stack until the stack

becomes empty or 2) the top operator has a lower precedence than the

current operator. Then, push the current operator to the stack.

2) Infix2Postfix algorithm

Algorithm

Initialize postfix to an empty StringBuilder.

1. Initialize a stack of characters to hold the operators and left parentheses.

2. while there are more tokens in the infix string

{

Get the next token.

if(the next token is a left parenthesis)

Push the token onto the stack. based on the idea b)

else if(the next token is an operand)

Append it to postfix. based on the idea a)

else if(the next token is an operator) similar to the processOperator method

of the textbook

Pop operators off the stack and append them to postfix untilone of the three

things occurs:


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1) stack becomes empty or

2) the top is an operator with lower precedence or

3) the top is '(' based on the idea b)

Push the token onto the stack

else

Discard the next token which should be a right parenthesis.

Pop operators off the stack and append them to postfix until the top is '('.

Pop and discard '('. (If no left parenthesis is encountered, then print an error

message indicating unbalanced parentheses, and halt)

} // while

4. Pop any remaining operators on the stack and append them to postfix. (There

should be no remaining left parentheses, otherwise the input expression did not

have balanced parenthesis.)

Note: An example of the while loop in the processOperator is

while (!operatorStack.isEmpty() &&

operatorStack.peek() != '(' &&

precedence(operatorStack.peek()) >=precedence(the current operator))

{ postfix = postfix + operatorStack.pop() + " "; }

operatorStack.push(the current operator);

3) Example

3 * X + (Y 12 ) Z 3 X * Y 12 + Z

3. Evaluating Postfix Expressions

Postfix expressions:

Parentheses-free.


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A space between two consecutive numbers.

Evaluation requires only one stack, which is a stack of operands.

No operator stack is required because each operation is done as soon as it is

read.

2) Algorithm (the eval method of the textbook)

1. Create an empty stack of integers.

2. while there are more tokens

{ Get the next token.

if (the next token is an operand)

Push the token onto the stack.

else // the next token is an operator

{ Pop the correctnumber for the operator from stack.

Evaluate the operation.

Push the result onto the stack.

}

}

3. Pop the stack and return the result.

1) Example

5 3 2 * + 4 5 + 12

(OR)

(b) (i) Write routines for input restricted dequeue.

Three functions:

1)Insert Right 2)Delete Right 3) Delete Left

insert_right()

{


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int added_item;

if((left == 0 && right == MAX-1) || (left == right+1))

{

printf("Queue Overflow\n");

return;}

if (left == -1) /* if queue is initially empty */

{

left = 0;

right = 0;

}

else

if(right == MAX-1) /*right is at last position of queue */right = 0;

else

right = right+1;

printf("Input the element for adding in queue : ");

scanf("%d", &added_item);

deque_arr[right] = added_item ;

}/*End of insert_right()*/

delete_left()

{

if (left == -1)

{

printf("Queue Underflow\n");

return ;

}

printf("Element deleted from queue is : %d\n",deque_arr[left]);

if(left == right) /*Queue has only one element */

{

left = -1;

right=-1;

}

else


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if(left == MAX-1)

left = 0;

else

left = left+1;

}/*End of delete_left()*/

delete_right()

{

if (left == -1)

{

printf("Queue Underflow\n");

return ;

}printf("Element deleted from queue is : %d\n",deque_arr[right]);

if(left == right) /*queue has only one element*/

{

left = -1;

right=-1;

}

else

if(right == 0)

right=MAX-1;

else

right=right-1;

}/*End of delete_right() */

(ii) Write ADT operation for circular queue

Operations: 1)Insertion 2) Deletion

void add(int item,int q[],int MAX,int front,int rear)

{

rear++;

rear= (rear%MAX);


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if(front ==rear)

{

printf("CIRCULAR QUEUE FULL ");

return;

}

else

{

cq[rear]=item;

printf("

Rear = %d Front = %d ",rear,front);

}

}

int del(int q[],int MAX,int front,int rear)

{int a;

if(front == rear)

{

printf("CIRCULAR STACK EMPTY");

return (0);

}

else

{

front++;


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front = front%MAX;

a=cq[front];

return(a);

printf("

Rear = %d Front = %d ",rear,front);

}

}

13. (a) Write routines for ADT operation of AVL tree.

Operations 1)Insertion 2) Deletion

struct node *insert (int info, struct node *pptr, int

*ht_inc)

{

struct node *aptr;

struct node *bptr;

if(pptr==NULL)

{

pptr = (struct node *) malloc(sizeof(struct node));

pptr->info = info;

pptr->lchild = NULL;

pptr->rchild = NULL;

pptr->balance = 0;

*ht_inc = TRUE;return (pptr);

}

if(info < pptr->info)

{


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pptr->lchild = insert(info, pptr->lchild, ht_inc);

if(*ht_inc==TRUE)

{

switch(pptr->balance)

{case -1: /* Right heavy */

pptr->balance = 0;

*ht_inc = FALSE;

break;

case 0: /* Balanced */

pptr->balance = 1;

break;

case 1: /* Left heavy */aptr = pptr->lchild;

if(aptr->balance == 1)

{

printf("Left to Left Rotation\n");

pptr->lchild= aptr->rchild;

aptr->rchild = pptr;

pptr->balance = 0;

aptr->balance=0;

pptr = aptr;

}

else

{

printf("Left to right rotation\n");

bptr = aptr->rchild;

aptr->rchild = bptr->lchild;

bptr->lchild = aptr;

pptr->lchild = bptr->rchild;

bptr->rchild = pptr;

if(bptr->balance == 1 )

pptr->balance = -1;

else


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pptr->balance = 0;

if(bptr->balance == -1)

aptr->balance = 1;

else

aptr->balance = 0;bptr->balance=0;

pptr=bptr;

}

*ht_inc = FALSE;

}/*End of switch */

}/*End of if */

}/*End of if*/

if(info > pptr->info)

{

pptr->rchild = insert(info, pptr->rchild, ht_inc);

if(*ht_inc==TRUE)

{

switch(pptr->balance)

{

case 1: /* Left heavy */

pptr->balance = 0;

*ht_inc = FALSE;

break;

case 0: /* Balanced */

pptr->balance = -1;

break;

case -1: /* Right heavy */

aptr = pptr->rchild;

if(aptr->balance == -1)

{

printf("Right to Right Rotation\n");

pptr->rchild= aptr->lchild;

aptr->lchild = pptr;

pptr->balance = 0;


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aptr->balance=0;

pptr = aptr;

}

else

{printf("Right to Left Rotation\n");

bptr = aptr->lchild;

aptr->lchild = bptr->rchild;

bptr->rchild = aptr;

pptr->rchild = bptr->lchild;

bptr->lchild = pptr;

if(bptr->balance == -1)pptr->balance = 1;

else

pptr->balance = 0;

if(bptr->balance == 1)

aptr->balance = -1;

else

aptr->balance = 0;

bptr->balance=0;

pptr=bptr;

}/*End of else*/

*ht_inc = FALSE;

}/*End of switch */

}/*End of if*/

}/*End of if*/

return(pptr);

}/*End of insert()*/

(OR)

(b) Write algorithm for ADT operation of priority queue.


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tmp = q->d[--q->size];

while (i size / 2) {

j = 2 * i;

if (j < q->size &&

PQPRIO(q->d[j]) < PQPRIO(q->d[j + 1])) {

j++;

}

if (PQPRIO(q->d[j]) d[i] = q->d[j];

i = j;

}

q->d[i] = tmp; return d; }

14. (a)Write heap sort routines. Using above design, sort the following:

15,20,70,07,11,24,53,81,60 (OR)

(b) (i) Write routines for quick sort.

(ii) Explain the external sorting.

15. (a)Write algorithm for weighted and unweighted shortest paths.

Explain the above algorithms with suitable examples.

Single-Source Shortest Path on Unweighted Graphs

(* unweighted single-source shortest path *)

letval q: queue = new_queue()

val visited: vertexMap = create_vertexMap() (* visited maps vertex->int *) fun expand(v: vertex) =

letval neighbors: vertex list = Graph.outgoing(v) val dist: int = valOf(get(visited, v))

fun handle_edge(v': vertex) = case get(visited, v') ofSOME(d') => () (* d' ( add(visited, v', dist+1);

push(q, v') )

inapp handle_edge neighbors


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endinadd(visited, v0, 0);

expand(v0);

while (not (empty_queue(q)) do expand(pop(q))

end

Single-Source Shortest Path on Weighted Graphs

letval q: queue = new_queue() val visited: vertexMap = create_vertexMap()

fun expand(v: vertex) =

letval neighbors: vertex list = Graph.outgoing(v) val dist: int = valOf(get(visited, v))

fun handle_edge(v': vertex, weight: int) =

case get(visited, v') ofSOME(d') =>

ifdist+weight < d' then add(visited, v', dist+weight)

else ()

| NONE => ( add(visited, v', dist+weight);

push(q, v') )

inapp handle_edge neighbors

endinadd(visited, v0, 0);

expand(v0);


end

This is nearly Dijkstra's algorithm, but it doesn't work. To see why, consider the

following graph, where the source vertex is v0 = A.

(* Dijkstra's Algorithm *)

letval q: queue = new_queue()


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val visited: vertexMap = create_vertexMap()

fun expand(v: vertex) = letval neighbors: vertex list = Graph.outgoing(v)

val dist: int = valOf(get(visited, v))

fun handle_edge(v': vertex, weight: int) = case get(visited, v') of

SOME(d') =>

ifdist+weight < d'

then ( add(visited, v', dist+weight);

incr_priority(q, v', dist+weight) )

else ()

| NONE => ( add(visited, v', dist+weight);

push(q, v', dist+weight) )

in

app handle_edge neighbors end

inadd(visited, v0, 0);

expand(v0);


end

(OR)

(b) Write and explain the prims algorithm and depth first searchalgorithm.

Prim's algorithm is known to be a good algorithm to find a minimum spanning tree.

1. Set i=0, S0= {u0=s}, L(u0)=0, and L(v)=infinity for v u0. If |V| = 1 then

stop, otherwise go to step 2.

2. For each v in V\Si, replace L(v) by min{L(v), dvui}. If L(v) is replaced, put a

label (L(v), ui) on v.

3. Find a vertex v which minimizes {L(v): v in V\Si}, say ui+1.

4. Let Si+1 = Si cup {ui+1}.

5. Replace i by i+1. If i=|V|-1 then stop, otherwise go to step 2.

B.E / B.Tech DEGREE EXAMINATION,MAY/JUNE 2006

THIRD SEMESTER


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Electronics and Communication Engineering


PART A (10 X 2 = 20 marks)

1. Mention any four problem solving strategies2. What do you mean by program verification

3. What is an ADT?

4. List few applications of queues.5. Construct an expression tree for the expression A+(B-C)*D*(E+F)

6. What do you mean by primary clustering?

7. Analyse the time complexity of insertion sort algorithm8. What is external sorting?

9. Define topological sorting

10.What are NP-complete problems? Give an examplePART B (5 X 16 = 80 marks)

11. (i) With an example, state and explain the algorithm/program to delete

an element from a lexically ordered tree (10)

(ii) Explain the quadratic probing hashing technique with an example(6)

12.(a) Explain in detail the top down design of problem solving

(OR)

(b) (i) With examples, explain how verification of program segments

with loops is done

(ii) Write notes on o-notation

13. (a) (i) Give a singly linked list, whose first node is pointed to by the

pointer variable C, formulate an algorithm/program to delete the first

occurrence of X from the list(10)

(ii) With examples, explain how a stack can be used to convert an

infix expression to a postfix expression (6)

(OR)


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(b) (i) Using linked lists, formulate separate routines to create an empty

stack and to push an element onto a stack (10)

(ii) Discuss in brief about the array implementation of queues (6)

14. (a) (i) State and explain the algorithm/program to perform Heap sort

(10)

(ii) Analyse the time complexity of quick sort algorithm (6)

(OR)

(b) (i) State the algorithm/program to perform shell sort. Also, analyse

its worst case running time. (8)

(ii) Explain any one external sorting with an example (8)

15. (a) (i) With an example, explain the topological sort (8)

(ii) Write the pseudo code for Dijkstras algorithm. What is the

running time of this algorithm? (8) (OR)

(b) (i) For the graph given below, construct 2

4 2 10

2 1 7

8 4

5 1 6

A minimum spanning tree using Prims algorithm. Show the table created

during each pass of the algorithm (12)

(ii) Write notes on Euler circuits (4)

1

1

2

53 4

6

7


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B.E / B.Tech DEGREE EXAMINATION,NOVEMBER/DECEMBER 2007

THIRD SEMESTER



TIME:3 Hrs MAXIMUM: 100

Marks

ANSWER ALL QUESTIONS

PART-A(10*2=20 marks)

1) When will you say an algorithm efficient? Give the notations for time

complexity.2) What is top-down design? Is C language a top down design?justify

your answer.

3) Why is linked list used for polynomial arithmetic?4) Write the role of stack in function call

5) What is the minimum number of nodes in an AVL tree of height 5?

6) What is the use of sentinel value in binary heap?

7) Which is the best way of choosing the pivot element in quick sort8) Merge sort is better than insertion sort .why?

9) Define a graph.how it differs from tree10)What is minimum spanning tree? Name any two algorithms used to

find MST.

PART-B(5*16=80 marks)

11) (a)(i)Given two lists L1 and L2, write the routines to compute L1 L2 using basic operations.(Hint :for efficient performance, sort the

lists). (10) (ii)Write the routines for inserting and deleting elements from a


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queue.Check for the conditions Q-empty and Q-full. (6)

(Or)

(b)(i) How would you implement a stack of queues? Write routines for

Creation and inserting of elements into it. (8)

(ii)Write routines to insert heterogeneous data into the list (8)

12 (a)(i)Write the routines to insert and remove node from binary

search tree.(10)

(ii)A full node is a node with two children .Prove that the number

of full Nodes plus one is equal to the number of leave in a binary tree.

(6) (Or)

(b)(i)Show the result of inserting 2, 1, 4, 5, 9, 3, 6,7into an empty

AVL tree. (6)

(ii) Write the procedures to implement single and double

rotations while inserting nodes in an AVL tree. (10)

13(a) Explain, with suitable examples the basic heap operations and

write Algorithms for the same (16)

(Or)

(b) How will you resolve the collisions, while inserting elements into

the hash able using separate chaining and linear probing? Write the

routines for inserting, searching and removing elements from the hash

table using the above mentioned technique.

14 (a) (i) Write the routines for sorting n elements in increasing order

using Heap Sort. (12)

(ii) Sort 3, 1,4,1,5,9,2,6 in decreasing order using heap sort. (4)

(Or)


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(b)(i)Explain with example, about the insertion sort. (6)

(ii)What is external sorting? Discuss the algorithms with proper

Examples (10)

15(a)(i)Discuss and write the program to perform topological sorting

(6)

(ii)What is single source shortest path problem?Discuss Dijikstras

single Source shortest path algorithm with an example. (10)

(Or)

(b)(i)write an algorithm to find the minimum cost spanning tree of an

undirected,weighted graph (8)

(ii)Find MST for the following graph (8)

B.E / B.Tech DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009

THIRD SEMESTER


EE2204 DATA STRUCTURES AND ALGORITHMS

A D

B

C

E

F

3

2

3

34

4


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TIME:3 Hrs MAXIMUM: 100

Marks

ANSWER ALL QUESTIONS

PART-A(10*2=20 marks)

1. Define Abstract Data Type.An ADT is a set of operation. Abstract data types are mathematical

abstractions.Eg.Objects such as list, set and graph along their operations can

be viewed as ADTs.

2. Convert the infix expression (A-B/C)*(D/E-F) into a postfix.Postfix: ABC/-DE/F-*

3. What are the steps to convert a general tree into binary tree?* use the root of the general tree as the root of the binary tree

* determine the first child of the root. This is the leftmost node in the

general tree at the next level

* insert this node. The child reference of the parent node refers to this

node

* continue finding the first child of each parent node and insert it belowthe parent node with the child reference of the parent to this node.

* when no more first children exist in the path just used, move back to

the parent of the last node entered and repeat the above process. In other

words, determine the first sibling of the last node entered.

* complete the tree for all nodes. In order to locate where the node fits

you must search for the first child at that level and then follow the

sibling references to a nil where the next sibling can be inserted. The

children of any sibling node can be inserted by locating the parent and then

inserting the first child. Then the above process is repeated.

4. List the applications of trees.


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a. Binary tree is used in data processing.

b. File index schemes

c.Hierarchical database management system

5. What do you mean by a heap?A heap is a specialized tree-based data structure that satisfies the heap

property: if B is a child node of A, then key (A) key(B). This implies that an

element with the greatest key is always in the root node, and so such a heap is

sometimes called a max-heap. (Alternatively, if the comparison is reversed, the

smallest element is always in the root node, which results in a min-heap.)

6. Define hashing.Hash function takes an identifier and computes the address of that identifier

in the hash table using some function

7. What is topological sort?It is an Ordering of vertices in a directed acyclic graph such that if there is a

path from vi to vj, then vj appears after vi in the ordering.

8. Define biconnected graph.A connected undirected graph is biconnected if there are no vertices whose

removal disconnects the rest of the graph.

9. State the greedy algorithm.A greedy algorithm is any algorithm that follows the problem solving

metaheuristic of making the locally optimal choice at each stage with the hope

of finding the global optimum.

10.Mention any two decision problems which are NP-Complete.NP is the class of decision problems for which a given proposed

solution for a given input can be checked quickly to see if it is really a

solution.

PART-B (5*16 = 80 Marks)


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(For page numbers refer DATA STRUCTURES AND ALGORITHM

ANALYSIS IN C by Allen Weiss)

11. (a) Explain the following operations in a doubly linked list. (page no:116)

(i) Insert an element (6)(ii) Delete an element (5)(iii) Reverse the list (5)

Or

(b) (i) Discuss the algorithms for push and pop operations on a stack

(page no:86) (8)

(ii) Write an algorithm to insert and delete a key in a circular queue

(page no:95)12. (a) (i) Construct all possible tree structure with 4 nodes.

(8)(page no:105)

(ii) Perform preorder, inorder and postorder traversals of the given

tree.(8)(page no:107) Or

(b) Explain the following operations on a binary search tree with

suitable Algorithms. (page no:116)

(i) find a node (5)(ii) Insert a node (5)

(iii) Delete a node (6)

13.(a) (i) Discuss how to insert an element in an AVL tree. Explain with

Algorithm (page no:126) (10)

(ii) What is B-Tree? Explain its properties. (page no:149) (6)

Or

(b) (i) Describe the different hashing functions with an example. (page

no:166) (8)


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(ii) Explain the common collision resolution strategies in open addressing

hashing. (page no:173)

(8)

14. (a) (i) Explain the breadth first search algorithm (page no:307)(8)

(ii) Write and explain the prims algorithm with an example(page

no:330)(8) Or

(b) (i) What is a strongly connected graph? Give an example. (page

no:299) (4)

(ii) Write the algorithm to compute lengths of shortest path page

no:306(4)

(iii) Explain the depth first search algorithm. (page no:335) (8)

15. (a) Find the optimal tour in the following traveling salesperson

problem Using dynamic programming. (page no:397) (16)

Or

(b) (i) Explain the method of solving N queens problem by back

tracking (10) (page no:417)

(ii) Discuss briefly the various asymptotic notations used in

algorithm Analysis (6)

EE2204 Data Structures and Algorithm QBrogh

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