/**
  * Add event to the correct partially stored int vector
  *
  * @param dynamicAddition static or dynamic constraint
  * @param constraintIdx index of the constraint
  */
 private void addEvent(boolean dynamicAddition, int constraintIdx) {
   if (dynamicAddition) {
     events.add(constraintIdx);
   } else {
     events.staticAdd(constraintIdx);
   }
 }