Give output: Note <list> is already include List<int>({1,2,3}); x.pop_front;cout <<x.front; x.pop_back; cout<<x.back <<x.size;

Question

how i solve , this one?

Answer 1

Answer is 221

Answer 2

is this question from the challenges ?

Answer 3

sahi hai sachya

Answer 4

yes.,this one from challenges.