Eroare de compilare: main.cpp: In function 'int main()': main.cpp:15:37: error: invalid use of non-static member function 'void std::stack<_Tp, _Sequence>::pop() [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >]' else if(s.top()!=a[i])s.pop; ~~^~~ In file included from /usr/include/c++/6/stack:61:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:89, from main.cpp:1: /usr/include/c++/6/bits/stl_stack.h:244:7: note: declared here pop() ^~~