{
//#include "TFile.h"
//#include "TTree.h"

auto f = new TFile("f.root", "recreate");
auto t = new TTree("t", "t");
int a=0, b=0;
t->Branch("a", &a, "a/I");
t->Branch("b", &b, "b/I");
t->Fill();
t->Write();
f->Close();
}