题解 | 记负均正

while True:
    try:
        n = int(input())
        arr = list(map(int, input().split()))
        # [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -1]
        arr1 = []  # 存储负数
        arr2 = []  # 存储正整数
        for i in arr:
            if i < 0:
                arr1.append(i)
            elif i > 0:
                arr2.append(i)
            else:
                continue

        if len(arr2) > 0:  # 有正整数
            avg_arr2 = round(sum(arr2) / len(arr2), 1)
            print(len(arr1), avg_arr2)
        else:  # 没有正整数
            print(len(arr1), 0.0)

    except:
        break