Please help ,This pop question is killing me😭😭

Question

even the code playground says "no output"
but in challenges i face this question where there is no option of "no output" and there is no information in courses either😵😵😵

so please tell me how it works!!
https://code.sololearn.com/cM2rt8Y3ph2L/?ref=app

Answer 1

When pop is encounter first element is removed depending on whether it is front or not .
else last element is removed.

Answer 2

it's actually 221

Answer 3

just read a bit it should be.
1. you create a deque 1, 2, 3
2. pop_front removes the first, so you have now 2, 3 in the deque.
3. You cout the front element, so output 2.
4. pop_back removes the last, so now it's only 2 in the deque.
5. Then cout back is 2 and cout size is 1.
6. Total output: 221

Answer 4

is 221 the correct answer?

Answer 5

still trying to figure out the no output part....

Answer 6

thanks @prabhu
nd u r ri8 @ nikolay

Answer 7

@ nikolay thanks again
and do u know y code playground doesnt show the output😅

Answer 8

i dont know @nikolay
i have never got correct answer in this question even once😅