题解 | 牛牛的数学作业

from math import inf
import sys

t = int(input())
input_stata = [li for li in sys.stdin]
num_li = [[] for pa in range(t)]
n = [0] * t
for idx, ele in enumerate(input_stata):
    if idx % 2 == 0:
        n[idx // 2] = int(ele)
    else:
        num_li[(idx - 1) // 2] = list(map(int, ele.split()))
result = [[] for i in range(t)]
avg_li = []
for i in range(t):
    max_num = -inf
    min_num = inf
    total = 0
    for num in num_li[i]:
        max_num = max(num, max_num)
        min_num = min(num, min_num)
        total += num
    result[i].append(str(max_num - min_num))
    avg_li.append(total/len(num_li[i]))
for i in range(t):
    total2 = 0
    for num in num_li[i]:
        total2 += (num - avg_li[i]) ** 2
    result[i].append(str(format(total2 / len(num_li[i]),'.3f')))
    print(" ".join(result[i]))