For data structure class.
If you are a maintainer or curious this branch is for you, otherwise I suggest you going with master.
The game depends on the proposed data structures implementations. You will first download the latest release build, or source code when you want to build by yourself, go here.
Now extract it, if you have downloaded the source or just add the jar to lib
directory and the IDE should
automatically recognize the dependency. In cases where the imports are still missing, and the dependency was not
recognized by auto, just point your build location as dependency to the project then everything should work just fine.