Value sharing of meromorphic functions and Fang's problem

In this paper, we shall study the uniqueness problems on meromorphic functions sharing a polynomial. We give a complete answer to a problem posed by Fang Mingliang. Our results improve or generalize those given by Fang and Hua, Yang and Hua, Fang, Fang and Qiu, Lin and Yi, Zhang, Xu, et al.
Comment: The authors regret Lemmma 2.8 is not cited correctly, which is different with [17. Theorem 4.8]