#Uses python3

import sys

def max_dot_product(a,b,n):


    a = a.sort(reverse=True)
    b = b.sort(reverse=True)
    res = 0

    for i in range(n):
        res += a[i]*b[i]
    return res

if __name__ == '__main__':
    data = [int(x) for x in input("").split()]
    n = data[0]
    a = data[1:(n + 1)]
    b = data[(n + 1):]
    print(max_dot_product(a,b,n))

当我运行此代码时，它表明“ TypeError：’NoneType’对象不可下标”。