题解 | 记负均正
def fun():
n = int(input())
m = list(map(int,input().split()))
neg_num = 0
pos_num = []
for i in m:
if i < 0:
neg_num += 1
if i > 0:
pos_num.append(i)
if len(pos_num) == 0:
mean_value = 0
else:
mean_value = sum(pos_num)/len(pos_num)
return neg_num, "{:.1f}".format(mean_value)
neg_num, mean_value = fun()
print(neg_num, mean_value)
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