Alga4

public static long[] planting(Event[] events) {

        TreeSet<Long> Tree = new TreeSet<Long>();

        for(int i = 0; i<events.length; i++){

            if(events[i].action.equals("kihajt")){

                if(Tree.ceiling(events[i].position) != null){
                    if((events[i].position - Tree.ceiling(events[i].position) >= 250)){
                        Tree.add(events[i].position);
                    }
                }else Tree.add(events[i].position);

                if(Tree.floor(events[i].position) != null){
                    if((events[i].position - Tree.floor(events[i].position) >= 250)){
                        Tree.add(events[i].position);
                    }
                }else Tree.add(events[i].position);

            }else Tree.remove(events[i].position);
        }

        long[] ret = new long[Tree.size()];

        int i = 0;
        for (Long elem : Tree) {
            ret[i] = elem;
            i++;
        }

        for (Long elem : Tree) {
            System.out.println(elem);
        }

return ret;
}