Compilare: user.cpp: In function ‘int main()’: user.cpp:75:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<rez.size();i++){ ~^~~~~~~~~~~ user.cpp:76:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<rez[i].size();j++) ~^~~~~~~~~~~~~~ user.cpp:77:36: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ [-Wformat=] fprintf(out,"%lld ",rez[i][j]); ^