题解 | 记负均正

while True:
    try:
        n = map(int, input())
        numbers = list(map(int, input().split()))
        numbers_fushu = []
        numbers_zhengshu = []
        for num in numbers:
            if num < 0:
                numbers_fushu.append(num)
            elif num > 0:
                numbers_zhengshu.append(num)
        if numbers_fushu:
            fushu_count = len(numbers_fushu)
        else:
            fushu_count = 0
        if numbers_zhengshu:
            avg_zhengshu = round(sum(numbers_zhengshu) / len(numbers_zhengshu), 11)
        else:
            avg_zhengshu = 0
        print(fushu_count, avg_zhengshu)

    except Exception as e:
        break