Compilare: user.cpp: In function ‘int main()’: user.cpp:39:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<st.top().size();i++) ^ user.cpp:47:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<st.top().size();i++) ^ user.cpp:50:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<apar[st.top()[i]][chc].size();j++) ^ user.cpp:53:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<apar[st.top()[i]][chc].size()) ^ user.cpp:15:16: warning: variable ‘vf’ set but not used [-Wunused-but-set-variable] int lc,chc,vf; ^