Compilare: user.cpp: In function ‘void ciclu()’: user.cpp:42:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[y].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:122:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1 ; j < sol.size() ; ++j) ^