GATE CSE · 2026 · CS2
Question 50: Programming and Data Structures
Give it a try, then reveal the answer to check your work.
Question 50
CS2MSQ2 marksNeeds review
Consider a stack
and a queue
. Both of them are initially empty and have the capacity to store ten elements each. The elements 1, 2, 3, 4, and 5 arrive one by one, in that order. When an element arrives, it is assigned either to
(pushed on
) or to
(enqueued to
). Once all the five elements are stored, the output is generated in two steps. First, stack
is emptied by popping all elements. Then queue
is emptied by dequeuing all elements. The output obtained by following this process is 4 3 1 2 5.Given the output, the objective is to predict whether an element was assigned to
or
.Which of the following options are possible valid assignment(s) of the elements?
Note: In the options, the notation
denotes that element
was assigned to
and
denotes that element
was assigned to
.Your answerSelect all correct options. You can choose more than one.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerEXPLORE & PRACTISE
Paper and topic context
See where this question comes from and choose what to practise next.
2026CS2
GATE CSE 2026 · Paper 2
Computer Science and Information Technology · Original paper archive
- Section
- Section CS2
- Question type
- Multiple select (MSQ)
- Marks
- 2 marks
Practise related topics
Explore more previous year questions using this question’s imported topic tags.
computer science
GATE CSE previous year questions
information technology
GATE CSE previous year questions
computing
GATE CSE previous year questions
programming data structures
GATE CSE previous year questions
Programming and Data Structures
GATE CSE previous year questions
Comments
Ask a question, share your approach, or help someone understand.
Log in to view the discussion
You’re not logged in. Log in or create an account to see discussions and add comments.