Compilare: user.cpp: In function ‘void bfs()’: user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[node].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Sol.size()!=N-1){ ^ user.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Sol.size();i++) ^