思路

遍历。

代码

while True:
    try:
        n = int(input())
        s = list(map(int, input().strip().split()))
        c = 0
        v = 0
        sum = 0
        for i in s:
            if i<0:
                c += 1
            elif i>0:
                v += 1
                sum += i
        print(str(c)+" "+f"{sum/v:.1f}")
    except:
        break