Compilare: user.cpp: In function ‘int main()’: user.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m1max.size();i++)g<<m1max[i]<<" "; g<<'\n'; ^ user.cpp:44:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m2max.size();i++)g<<m2max[i]<<" "; g<<'\n'; ^