Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[w].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) g<<sol[i]<<" "; ^