Multidimensional vector

hi…
How is the best way to iniazialize a 333 vector?
thanks

i solved in this way:

 box4.resize(3);
    for(int i=0; i<3; i++){
            box4[i].resize(3);
                for(int j=0; j<3; j++){
                    box4[i][j].resize(3);
                    }
            }