the difference easy hard version complete project easy version necessary hard versionpolycarp famous freelancer his current rating r unitssome rich customer ask complete project company to complete ith project Polycarp need a_i unit rating complete project rating change b_i rating increase decrease b_i b_i positive negative Polycarps rating fall zero people will not trust low rate freelancerpolycarp choose order complete project furthermore skip project altogetherto gain experience money course Polycarp wants choose subset project have maximum possible size order complete rating start project nonnegative rating complete projectYour task calculate maximum possible size subset project