AI demo framework

import pickle
import matplotlib.pyplot as plt
from sklearn import datasets
from sklearn.model_selection import train_test_split
from sklearn.neighbors import KNeighborsClassifier
from sklearn.model

234. Copyright

Question link: https://leetcode-cn.com/problems/palindrome-linked-list/submissions/

Question-solving ideas: Cut in half, reverse the second half, and compare whether the two halves are equal.