AP CSA FRQ Guide
2011 FRQ 2: AttractiveCritter
Write a legacy critter that attempts to move other actors one cell closer before moving like a normal critter.
Legacy GridWorld Actor Movement22 minute targetGridWorldobjectsmovementlegacy
Skills Tested
What this FRQ is really practicing
GridWorldobjectsmovementlegacy
Treat these skills as the study checklist. If any tag feels shaky, review that topic before attempting the full written response.
Starter Approach
How to begin without copying a solution
- 1Override the appropriate Critter processing method, not act.
- 2For each other actor, compute a location one step closer.
- 3Move an actor only if the destination is empty.
Write a first attempt before revealing any solution outline. Most AP CSA FRQ progress comes from tracing your own code and finding the missing case.
Common Mistakes
Mistakes to watch for while writing
Overriding act and breaking Critter postconditions.
Moving actors into occupied cells.
Moving the attractive critter instead of the other actors during processing.
Self Check
Review questions before you submit
Declares AttractiveCritter as a Critter.
This is a legacy GridWorld archive prompt.
Overrides actor-processing behavior.
The prompt explicitly says not to override act.
Computes direction toward this critter.
Use the GridWorld direction helper named in the prompt.
Moves another actor only to an empty valid location.
Occupied destinations should leave the actor where it is.
Practice Links