无和集问题。设s是一个正整数集合。s是一个无和集当且仅当x,y属于s,但x+y不属于s.

设计一个算法，计算f(n)的值-no problems and sets. S is a set up is a set of integers. S is a set - and if and only if x, y belong s, x y s. Design is not an algorithm to calculate f (n) values