code: public int getNumRuns(String problemID, String searchID){
          if(!results.containsKey(problemID)){
              throw new UnknownIDException("Unknown problem ID " + problemID + ".");
          }
          if(!results.get(problemID).containsKey(searchID)){
              throw new UnknownIDException("Unknown search ID " + searchID + " for problem " + problemID + ".");
          }
          return results.get(problemID).get(searchID).size();
      }
docs: Get the number of performed runs of the given search when solving the given problem.
  
  @param problemID ID of the problem
  @param searchID ID of the applied search
  @return number of performed runs of the given search when solving the given problem
  @throws UnknownIDException if an unknown problem or search ID is given