{
gInterpreter->GenerateDictionary("vector<vector<vector<Float_t>>>", "vector");

vector<vector<vector<Float_t>>> a;
vector<vector<Float_t>> b;
vector<Float_t> c;

c.push_back(1.);
c.push_back(2.);
c.push_back(3.);
b.push_back(c);
c.clear();
c.push_back(10.);
c.push_back(20.);
c.push_back(30.);
b.push_back(c);
a.push_back(b);

auto f = TFile("test_vec.root", "create");
auto t = TTree("t", "t");
t.Branch("v", &a);
t.Fill();
t.Write();
t.Scan();
cout << a[0][0][0] << endl;
f.Close()
}