Book based on movie "The Platform"? In future, prisoners in vertical cells watch as inmates in upper cells are fed while those below starve.

[Robert]

I just finished watching the movie “The Platform.” I’m almost 100% certain I’ve read a book exactly like the movie in the past 10 years except the ending in the book is different as in the movie. Here’s a description of the movie: “In the future, prisoners housed in vertical cells watch as inmates in the upper cells are fed while those below starve.”
Anyone else read a book like this?

[Kris]

Robert, IMDB.com says the movie "The Platform" (2019) is based on "a story" by David Desola.

I added some plot details to the header/ topic title. Feel free to edit it.

[Sara]

I also know that I’ve read a book exactly like this. Or maybe it was a short story. I haven’t seen the movie but I was searching for the book and found the movie. I know that I read it a long time ago, almost 10 years ago. But I can’t find any reference to this movie being based on anything but a script. We’re you able to find the story?

[Jade]

I googled a bit and found some suggestions on reddit, but it's reddit so could be way off. Do either of these sound like it?

Short Story: The Report by Brian Evenson, within the book A Collapse of Horses

Wool by Hugh Howy