Compilare: user.cpp: In function ‘int main()’: user.cpp:22:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st.back() < x && st.size() + n-i > m-1){ ^ user.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size() < m) ^ user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<st.size(); i++) ^