题解 | #记负均正#

import sys

lines=sys.stdin.readlines()

length=len(lines)
for i in range(1, length//2+2, 2):
    count_negetive=0
    count_positive=0
    positive_sum=0

    line=lines[i][:-1]
    temp_list=line.split()
    for c in temp_list:
        num=eval(c)
        if num<0:
#             print(num, '---')
            count_negetive+=1
        elif num>0:
#             print(num, '+++')
            count_positive+=1
            positive_sum+=num

    print(count_negetive, f'{positive_sum/count_positive:.1f}')