why can't my func "ctn" run normally?

Question

https://code.sololearn.com/cuox2Gofcne5/?ref=app

Answer 1

Bennett Post I don't know the exactly meaning of your "read".But if you means useing.I did use it in the latter cout statment. ◔̯◔?

Answer 2

Bennett Post Thanks a lot for your patience:)
I didn't know the statement in 317 is which you add for me.So i didn't really understand it at first. So sorry for taking so much of your time. 🙏