1
GATE CSE 2024 Set 2
MCQ (More than One Correct Answer)
+2
-0.66

Let S1 and S2 be two stacks. S1 has capacity of 4 elements. S2 has capacity of 2 elements. S1 already has 4 elements: 100, 200, 300, and 400, whereas S2 is empty, as shown below.

Stack S1
400 (Top)
300
200
100
Stack S2

Only the following three operations are available:

PushToS2: Pop the top element from S1 and push it on S2.
PushToS1: Pop the top element from S2 and push it on S1.
GenerateOutput: Pop the top element from S1 and output it to the user.

Note that the pop operation is not allowed on an empty stack and the push operation is not allowed on a full stack.

Which of the following output sequences can be generated by using the above operations?

A

100, 200, 400, 300

B

200, 300, 400, 100

C

400, 200, 100, 300

D

300, 200, 400, 100

2
GATE CSE 2021 Set 1
Numerical
+2
-0.67

Consider the following sequence of operations on an empty stack.

push(54); push(52); pop(); push(55); push(62); s = pop();

Consider the following sequence of operations on an empty queue.

enqueue(21); enqueue(24); dequeue(); enqueue(28); enqueue(32); q = dequeue();

The value of s + q is ______

Your input ____
3
GATE CSE 2014 Set 2
MCQ (Single Correct Answer)
+2
-0.6
Suppose a stack implementation supports an instruction REVERSE, which reverses the order of elements on the stack, in addition to the PUSH and POP instructions. Which one of the following statements is TRUE with respect to this modified stack?
A
A queue cannot be implemented using this stack.
B
A queue can be implemented where ENQUEUE takes a single instruction and DEQUEUE takes a sequence of two instructions.
C
A queue can be implemented where ENQUEUE takes a sequence of three instructions and DEQUEUE takes a single instruction.
D
A queue can be implemented where both ENQUEUE and DEQUEUE take a single instruction each
4
GATE CSE 2012
MCQ (Single Correct Answer)
+2
-0.6
Suppose a circular queue of capacity (n – 1) elements is implemented with an array of n elements. Assume that the insertion and deletion operations are carried out using REAR and FRONT as array index variables, respectively. Initially, REAR = FRONT = 0. The conditions to detect queue full and queue empty are
A
full: (REAR+1)
mod n == FRONT
empty: REAR == FRONT
B
full: (REAR+1)
mod n == FRONT
empty: (FRONT+1)
C
full: REAR == FRONT
empty: (REAR + 1)
mod n == FRONT
D
full: (FRONT+1)
mod n == REAR
empty: REAR == FRONT
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