Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:28:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘void Solve(int, int)’: user.cpp:67:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans=0,old=0; ^ user.cpp:105:36: warning: ‘res.result::poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<res.a<<" "<<res.b<<" "<<res.poz<<"\n"; ^ user.cpp:105:24: warning: ‘res.result::b’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<res.a<<" "<<res.b<<" "<<res.poz<<"\n"; ^ user.cpp:105:12: warning: ‘res.result::a’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<res.a<<" "<<res.b<<" "<<res.poz<<"\n"; ^