CAS Key Laboratory for Theoretical Physics;
Institute of Theoretical Physics;
Chinese Academy of Sciences;
Beijing 100190;
China;
MinJiang Innovative Center for Theoretical Physics;
MinJiang University;
Fuzhou 350108;
China;
School of Physical Sciences;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
K-core collapse; spin glass model; tree packing; optimal initial condition; random graph;