题解 | #记负均正#
记负均正
http://www.nowcoder.com/practice/6abde6ffcc354ea1a8333836bd6876b8
保留小数那里容易出问题，另外就是除以0的情况需要注意。
import sys
n = int(input())
list1 = list(map(int, input().split()))
pos = 0
count_pos = 0
count_neg = 0
for i in list1:
if i >0:
count_pos += 1
pos += i
elif i < 0 :
count_neg += 1
if count_pos !=0:
ave_pos = format(pos/count_pos,'.1f')
else:
ave_pos = float(0)
print(count_neg,ave_pos,end=' ')
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