Function SCIPgetRootNode 

pub unsafe extern "C" fn SCIPgetRootNode(
    scip: *mut SCIP,
) -> *mut SCIP_NODE

gets the root node of the tree

@return the root node of the search tree

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_INITPRESOLVE - \ref SCIP_STAGE_PRESOLVING - \ref SCIP_STAGE_EXITPRESOLVE - \ref SCIP_STAGE_SOLVING