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)))
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