For “std::vector<std::vector >” see [url]Storing 2D vector [--> vector<vector<...> >] into a TTree
For “std::vector<std::vectorstd::string >” see [url]Problem in getting the vector < vector <string> > branch
BTW. The “#pragma link C++” is irrelevant for the compiler when you compile your class’es source code. You would need to call “rootcint” in order to build the dictionary for your class. A separate additional source code file would be created which you would need to compile and add that additional object file to the linker command line.