Commons for Codeforces and related projects.
Add dependency description to Maven's pom.xml:
<dependencies>
...
<dependency>
<groupId>com.codeforces</groupId>
<artifactId>commons</artifactId>
<version>2.3-SNAPSHOT</version>
</dependency>
...
</dependencies>
Add repository reference to Maven's pom.xml:
<repositories>
...
<repository>
<id>codeforces-commons</id>
<url>https://github.com/Codeforces/codeforces-commons/raw/master/repo/maven/</url>
</repository>
...
</repositories>