题解 | 记负均正
记负均正
https://www.nowcoder.com/practice/6abde6ffcc354ea1a8333836bd6876b8
n = int(input()) s = list(input().split()) a = [] b = [] for i in s: if int(i)<0: a.append(i) if int(i)>0: b.append(int(i)) if b: result=sum(b)/len(b) else: result =0 print(str(len(a))+' '+str(round(result,11)))