GATE CSE Programming and Data Structures PYQs & Answers

Questions 1–10 of 106. Imported answers require independent review unless marked reviewed.

The set T represents various traversals over binary tree. The set S represents the order of visiting nodes during a traversal.

T | S I: Inorder | L: left subtree, node, right subtree II: Preorder | M: node, left subtree, right subtree III: Postorder | N: left subtree, right subtree, node

Which one of the following is the correct match from T to S?

Your answerChoose one option.

I – L, II – M, III – N

I – M, II – L, III – N

I – N, II – M, III – L

I – L, II – N, III – M

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In C runtime environment, which one of the following is stored in heap?

Your answerChoose one option.

A static variable declared inside a function

An array of integers declared inside a function

A dynamically allocated array of integers created using malloc() function call

Return address of a function

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Consider the following three ANSI-C programs, P1, P2, and P3.

P1:

#include <stdio.h>

int a=5;

int main(){

int a=7;

return(0);

}

P2:

#include <stdio.h>

int main(){

int a=5;

int a=7;

return(0);

}

P3:

#include <stdio.h>

int main(){

int a=5;

float a=7;

return(0);

}

Which one of the following statements is true?

Your answerChoose one option.

Only P1 will compile without any error

Only P2 will compile without any error

Only P3 will compile without any error

All three programs P1, P2, and P3 will compile without any error

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Let

be an odd number greater than 100. Consider a binary min heap with

elements stored in an array

whose index starts from 1.

Which of the following indices of

do/does NOT correspond to a leaf node of the min heap?

Your answerSelect all correct options. You can choose more than one.

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The keys 5, 28, 19, 15, 26, 33, 12, 17, 10 are inserted into a hash table using the hash function

. The collisions are resolved by chaining. After all the keys are inserted, the length of the longest chain is __________. (answer in integer)

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The height of a binary tree is the number of edges in the longest path from the root to a leaf in the tree. The maximum possible height of a full binary tree with 23 nodes is ________. (answer in integer)

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Consider the following program in C:

#include <stdio.h>

void func(int i, int j) {

if(i < j) {

int i = 0;

while (i < 10) {

j += 2;

i++;

}

printf("%d", i);

}

int main() {

int i = 9, j = 10;

func(i, j);

return 0;

}

The output of the program is ________. (answer in integer)

Note: Assume that the program compiles and runs successfully.

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Consider the following code snippet in C language that computes the number of nodes in a non-empty singly linked list pointed to by the pointer variable head.

struct node{

int elt;

struct node *next;

};

int getListSize (struct node *head)

{

if( E1 ) return 1;

return E2;

}

Which one of the following options gives the correct replacements for the expressions E1 and E2?

Your answerChoose one option.

E1: head == NULL; E2: 1 + getListSize(head)

E1: head->next == NULL; E2: 1 + getListSize(head->next)

E1: head == NULL; E2: 1 + getListSize(head->next)

E1: head->next == NULL; E2: 1 + getListSize(head)

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Let

be the set of all integers from 1 to 15. Consider any order of insertion of the elements of

into a binary search tree that creates a complete binary tree.

Which one of the following elements can NEVER be the third element that is inserted?

Your answerChoose one option.

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Consider a binary search tree (BST) with

leaf nodes (

). Given any node

, the key present in the node is denoted as

. All the keys present in the given BST are distinct. The keys belong to the set of real numbers.

For a node

, let

denote the node that is its inorder successor. If a node

does not have an inorder successor, then

. As there are no duplicates, if

is not

, then

Corresponding to every leaf node

that has a non-NULL

, a new key

with the following property is to be inserted into the BST.

Let

represent the list of all such new keys to be inserted into the BST.

Which of the following statements is/are true?

Your answerSelect all correct options. You can choose more than one.

cannot have any duplicates

will have at least one element

After inserting all keys from

, the height of the BST can increase at most by one

Number of nodes in the BST will double after inserting all keys from

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GATE CSE Programming and Data Structures PYQs

How to practice Programming and Data Structures

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