The problem.yaml is one part of the set of files that compose a problem description and data files.
See the article Problem Format for a complete list of files that describe a problem.
Contents of problem.yaml
# Problem configuration source: ICPC Mid-Atlantic Regional Contest author: John von Judge rights_owner: ICPC name: Sumit Sample Problem
The source, author, and rights_owner are optional.
name: is followed by the title of the problem.