This contest is a mirror for the Croatian Open Competition in Informatics.

This problem set will come from contest #3 of the COCI 2020/2021. The round will not be rated.

There will be $5$ problems to solve in $3$ hours. Partial scoring may be available on some problems.

The scores obtainable on each problem are 50, 70, 110, 110, 110 respectively for a maximum score of 450.

There is a limit of 50 submissions per problem.