题目2应该是返回false <img width="947" alt="image" src="https://user-images.githubusercontent.com/8787046/204129817-23343a15-33b9-450b-9085-4a031e010fc5.png"> 扩容方式 <img width="518" alt="image" src="https://user-images.githubusercontent.com/8787046/204129952-ef9eba66-312e-4abc-b974-01c36d828c44.png">