题解 | 记负均正

def func():
    n = int(input())
    alist = list(map(int, input().split()))

    cnt = 0
    avelist = []
    ave = 0

    for i in alist:
        if i < 0:
            cnt += 1
        elif i > 0:
            avelist.append(i)

    if len(avelist) > 0:
        ave = sum(avelist)/len(avelist)
    print(cnt, ave)


if __name__ == "__main__":
    func()