Eroare de compilare: main.cpp: In function 'int main()': main.cpp:17:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( !st.empty() and st.size() > k - n + i and st.top() < ch - '0' ) ~~~~~~~~~~^~~~~~~~~~~ main.cpp:19:16: error: invalid use of member function 'std::stack<_Tp, _Sequence>::size_type std::stack<_Tp, _Sequence>::size() const [with _Tp = char; _Sequence = std::deque<char, std::allocator<char> >; std::stack<_Tp, _Sequence>::size_type = long unsigned int]' (did you forget the '()' ?) if( st.size <= k) ~~~^~~~ main.cpp:10:15: warning: unused variable 'poz' [-Wunused-variable] int n, k, poz; ^~~ Non zero exit status: 1