题解 | 记负均正

import sys
n = int(input())
list1 = list(map(int,sys.stdin.readline().strip().split()))
# print(n)
# print(list1)
positive_list = []
minus_count = 0
for i in list1:
    if i < 0 :
        minus_count += 1
    elif i > 0 :
        positive_list.append(i)
# print(minus_count)
# print(positive_list)
average_num = 0
if  len(positive_list) != 0:
    average_num = sum(positive_list)/len(positive_list)
print(minus_count,f'{average_num:.8f}')