What does ( make it dequeue efficient mean ) in the problem ( Dequeue efficient queue using stack )

#1

i have written the code for the problem ( Dequeue efficient queue using stack ). it is running fine. i just want to know what does [ make it dequeue efficient ] mean?
does it mean that we have to implement the pop() in O(1) time and let the push() take O(n) time ??

my code :- https://ide.codingblocks.com/s/265294

I did not get the question
#2

You are right! this is what it exactly mean!

#3

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