Compilare: user.cpp: In function ‘void Check(int)’: user.cpp:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[k].size();i++) ^ user.cpp: In function ‘void Solve()’: user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nodp].size();i++) ^ user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[act].size();j++) ^ user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[act].size();j++) ^ user.cpp:49:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(t=0;t<v[nod].size();t++) ^