题解 | #记负均正#
记负均正
https://www.nowcoder.com/practice/6abde6ffcc354ea1a8333836bd6876b8
n = int(input())
li = list(map(int, input().split()))
counter = 0
sum = 0
counter2 = 0
for i in li:
if i < 0:
counter += 1
elif i > 0:
sum += i
counter2 +=1
if counter2 != 0: # 0不能做分母
res = sum / counter2
else:
res = 0
print(counter,f'{res:.1f}')
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