题解 | #记负均正#
记负均正
https://www.nowcoder.com/practice/6abde6ffcc354ea1a8333836bd6876b8
while True:
try:
n=int(input())
lst=list(map(int,input().split()))
fs=0
zs=0
zero=0
sum=0
for a in lst:
if a==0:
zero+=1
elif a<0:
fs+=1
elif a>0:
zs+=1
sum+=a
if zs==0:
print(fs,0.0)
else:
print(fs,format(sum/zs,'.1f'))
except:
break
