题解 | 记负均正

def func(nums):
    m = 0
    res = []
    for i in nums:
        if i < 0:
            m += 1
        elif i > 0:
            res.append(i)
    print(m, end=" ")
    avg = 0
    if res:
        avg = round(sum(res)/len(res), 11)
    print(avg)
    


while True:
    try:
        n = int(input())
        nums = [int(i) for i in input().split()]
        func(nums)
    except:
        break