It seems a bad behavior

Coding Interview Prep > Data Structures > Learn how a Stack Works

I passed the challenge, but it doesn’t count on the curriculum.

Hello there,

What do you mean by this? Have you passed the tests, and submitted your solution?

Yes, I passed the test and submitted the solution that was accepted by the system, but the curriculum didn’t count it, just like in the image.

example

But now the problem seems solved.