Compilare: user.cpp: In function ‘void euler()’: user.cpp:75:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[aux.nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:99:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^