How to get histogram from multiple folders?

ROOT
1

I wanna read a histogram stored in a root file with multiple folders. The root file is shown as below. How can I read the histogram"MVA_BDT_S".
image

2

Try:

auto f = TFile::Open("tth_output.root");
auto h = f->Get("dataset/Method_BDT/BDT/MVA_BDT_S");
h->Draw();
3

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