实现可视化的A星算法演示，测试了不同的评估函数对A星效率的影响。算法可以单独使用-Visualization of the A star algorithm is demonstrated to test different evaluation function A Star efficiency. Algorithm can be used alone

Tic-tac-toe游戏搜索引擎，带有特定深度的minimax tree，并且自带有一个可以在非叶结点处进行评估的评估函数-Tic-tac-toe game search engine, with particular depth minimax tree, and comes with an assessment of the non-leaf nodes at the evaluation function