Sometimes funny things happen on contests. On a recent training Ivan Fefer was unsuccessfully submitting one of the problems for a long time. After all he asked me. There followed this dialogue:
Ivan: - I have a question on the problem D.
Me: - What is the problem?
Ivan: - It is about a tree and requests.
Me: - So it's C.
Ivan: - ...oops... The question is removed ...
Do you have a funny story about something that happened to you during the contests?"