Study the following code and indicate which of the trace diagrams correctly describes the different steps in the code include include int main ( ) Create a deque of integers std deque dq Add elements to the front and back dq push back ( 1 ) dq push back ( 2 ) dq push front ( 0 ) dq push front ( 1 ) Print the contents of the deque std cout Deque contents for ( const int elem dq ) std cout elem std cout std endl Access elements std cout First element dq front ( ) std endl std cout Last element dq back ( ) std endl Remove elements from the front and back dq pop front ( ) Removes 1 dq pop back ( ) Removes 2 Print the contents after removals std cout Deque contents after pop operations for ( const int elem dq ) std cout elem std cout std endl Check the size of the deque std cout Deque size dq size ( ) std endl return 0 a Initial State Empty deque After push back ( 1 ) Deque contains 1 After push back ( 2 ) Deque contains 1 , 2 After push front ( 0 ) Deque contains 0 , 1 , 2 After push front ( 1 ) Deque contains 1 , 0 , 1 , 2 After pop front ( ) Deque contains 0 , 1 , 2 After pop back ( ) Deque contains 0 , 1 Final Size 2 b Initial State Empty deque After push back ( 1 ) Deque contains 1 After push back ( 2 ) Deque contains 2 , 1 After push front ( 0 ) Deque contains 0 , 2 , 1 After push front ( 1 ) Deque contains 1 , 0 , 2 , 1 After pop front ( ) Deque contains 0 , 2 , 1 After pop back ( ) Deque contains 0 , 2 Final Size 2 c Initial State Empty deque After push back ( 1 ) Deque contains 1 After push back ( 2 ) Deque contains 2 , 1 After push front ( 0 ) Deque contains 2 , 1 , 0 After push front ( 1 ) Deque contains 2 , 1 , 0 1 After pop front ( ) Deque contains 1 , 0 , 1 After pop back ( ) Deque contains 1 , 0 Final Size 2 d None of the options provided is correct

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Question: Study the following code and indicate which of the trace diagrams correctly describes the different steps in the code. #include #include int main ( )

Study the following code and indicate which of the trace diagrams correctly describes the different steps in the code.

#include

int main

() {

/ /

Create a deque of integers

std::deque dq;

/ /

Add elements to the front and back

.

push

_

back

(1)

;

.

push

_

back

(2)

;

.

push

_

front

(0)

;

.

push

_

front

(- 1)

;

/ /

Print the contents of the deque

std::cout

< <

"Deque contents:

"

;

for

(

const int &elem : dq

) {

std::cout

< <

elem

< < " "

;

}

std::cout

< <

std::endl;

/ /

Access elements

std::cout

< <

"First element:

" < <

.

front

() < <

std::endl;

std::cout

< <

"Last element:

" < <

.

back

() < <

std::endl;

/ /

Remove elements from the front and back

.

pop

_

front

()

;

/ /

Removes

- 1

.

pop

_

back

()

;

/ /

Removes

2

/ /

Print the contents after removals

std::cout

< <

"Deque contents after pop operations:

"

;

for

(

const int &elem : dq

) {

std::cout

< <

elem

< < " "

;

}

std::cout

< <

std::endl;

/ /

Check the size of the deque

std::cout

< <

"Deque size:

" < <

.

size

() < <

std::endl;

return

0

;

}

.

Initial State: Empty deque.

After push

_

back

(1)

: Deque contains

[1] .

After push

_

back

(2)

: Deque contains

[1, 2] .

After push

_

front

(0)

: Deque contains

[0, 1, 2] .

After push

_

front

(- 1)

: Deque contains

[- 1, 0, 1, 2] .

After pop

_

front

()

: Deque contains

[0, 1, 2] .

After pop

_

back

()

: Deque contains

[0, 1] .

Final Size:

2 .

.

Initial State: Empty deque.

After push

_

back

(1)

: Deque contains

[1] .

After push

_

back

(2)

: Deque contains

[2, 1] .

After push

_

front

(0)

: Deque contains

[0, 2, 1] .

After push

_

front

(- 1)

: Deque contains

[- 1, 0, 2, 1] .

After pop

_

front

()

: Deque contains

[0, 2, 1] .

After pop

_

back

()

: Deque contains

[0, 2] .

Final Size:

2 .

.

Initial State: Empty deque.

After push

_

back

(1)

: Deque contains

[1] .

After push

_

back

(2)

: Deque contains

[2, 1] .

After push

_

front

(0)

: Deque contains

[2, 1, 0] .

After push

_

front

(- 1)

: Deque contains

[2, 1, 0 . - 1] .

After pop

_

front

()

: Deque contains

[1, 0, - 1] .

After pop

_

back

()

: Deque contains

[1, 0] .

Final Size:

2 .

.

None of the options provided is correct.

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