WordPress. How to remove posts from parent category?

Question

PHP

Hello. There is a category, also there are its child categories. I add articles to child categories, but when I switch to the parent category, the posts are also displayed. How can I remove the output in the parent category so that they are displayed only in those child categories where I added a post?

Answer 1

The question is closed! Answer. added to request
query_posts('category__in='.$cat);