Hi everyone, this discussion has a link to all ZCO problems. Beginner concepts and problems. And this one has the links to all INOI problems, Intermediate concepts and problems. Please use the existing discussions to ask questions about relevant ZCO, INOI problems and do not create duplicate discussions on the same problems.
If you want to discuss ZIO problems, links to existing discussions can be found here: Zonal Informatics Olympiad (ZIO) . Create a new discussion for a problem only if a discussion for the problem does not exist. Else, use the existing one.
P.S.: I deleted some duplicate discussions and moved the replies to the official discussions.