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利用查表法 可以实现 但不稳定 有时候就会不输出
参考这个程序吧：http://wenku.baidu.com/link?url=hN6nj60BC0RvMZorGtT6VMR9YONUgnozQpYxXL-m_Gs8rtkIvKKChsL2uYrsaPRLI34PtYtm-Fpmh7gBz-4jnO03z6vMg3NUQ2dRVVXUBoO
