Compilare: user.cpp: In function ‘void bicon(int, int)’: user.cpp:45:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int inv(int)’: user.cpp:77:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void solve()’: user.cpp:83:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Sol[i].size();j++) ^