题解 | 异常值与缺失值

import numpy as np
def preprocess_data():
    n = int(input().strip())
    data = np.array([float(input().strip()) for _ in range(n)])
    mean = np.mean(data[data != -1])
    data[data == -1] = mean
    return np.round(data[(data >= 200) & (data <= 800)], 4)