int numberOfGuys = 10000;
    List<Integer> list = new ArrayList<>();
    for ( int i = 1; i <= numberOfGuys; i++ ) {
        list.add( i );
    }
    boolean isNeighbour = false;

    System.out.println( list );
    Iterator<Integer> i = list.iterator();
    list = new ArrayList<>();
    boolean isTrue = true;
    while ( isTrue ) {
        int k = i.next();
        if ( isNeighbour )
            i.remove();
        else {
            list.add( k );
        }
        if ( !i.hasNext() ) {
            System.out.println( list );
            i = list.iterator();
            if ( list.size() == 1 )
                isTrue = false;
            list = new ArrayList<>();
        }
        isNeighbour = !isNeighbour;
    }
}