Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (n-i+st.size() == m) ^ user.cpp:27:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( !st.empty() && st.top()<v[i] && n-i-1+st.size()>=m ) ^ user.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st.size()<m) ^