题解 | 记负均正
n=int(input())
l=map(int,input().split())
c1=0
c2=0
sum=0
for i in l:
if i>0:
sum+=i
c1+=1
if i<0:
c2+=1
if c1==0:
print(c2,c1)
else:
print(c2,round(sum/(c1),6))
n=int(input())
l=map(int,input().split())
c1=0
c2=0
sum=0
for i in l:
if i>0:
sum+=i
c1+=1
if i<0:
c2+=1
if c1==0:
print(c2,c1)
else:
print(c2,round(sum/(c1),6))
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