Database.Result - Insert com lógica

Account z = new Account(Name=null);
List<Account> contas = new List<Account>{new Account(Name='VolksWagen'),
                                         new Account(Name='Fiat'),
                                         z,
                                         new Account(Name='Jeep'),
                                         new Account(Name=null)};
try{
    Database.SaveResult[] resultado = Database.insert(contas, false);
    List<Database.SaveResult> listaDBSR = new List<Database.SaveResult>();
    for(Database.SaveResult dsr:resultado){
        listaDBSR.add(dsr);
    }
    List<Database.SaveResult> success = new List<Database.SaveResult>();
    List<DataBase.Error> errors = new List <DataBase.Error>();
    Integer errorsIndexCount = 0;
    Map<Integer,List<DataBase.Error>> mapaErros = new Map<Integer,List<DataBase.Error>>();
    for(Database.SaveResult datasr:listaDBSR){
        if(datasr.isSuccess()){
            success.add(datasr);
        }else{
            errors = datasr.getErrors();
            mapaErros.put(errorsIndexCount, errors);
        }
        errorsIndexCount++;
    }
    System.debug('Registros com sucesso: ');
    for(Database.SaveResult s:success){
        System.debug(s.Id);
    }
    System.debug('Registros com erros: '+mapaErros.size()+' registros');
    for(Integer i:mapaErros.keySet()){
        System.debug('Registro nº '+i);
        for(Database.Error de:mapaErros.get(i)){
            System.debug(de.getMessage());
            System.debug(de.getStatusCode());
            System.debug(de.getFields());
        }
    }
}catch(DMLException d){
    System.debug(d.getMessage());
}