WANG Jun-jie (1999-), male, native of Tengzhou, Shandong, postgraduate student of East China University of Science and Technology, engages in extremal graph theory; YU Yang (2003-), male, native of Hanzhong, Shaanxi, undergraduate student of East China University of Science and Technology; HU Jianbiao (2003-), male, native of Shangrao, Jiangxi, undergraduate student of East China University of Science and Technology; WEN Peng (2003-), female, native of Xiamen, Fujian, undergraduate student of East China University of Science and Technology