#include?
#include?
#include?
#include?
#include?
using?namespace?std;

struct?pid_info{???//store?processes‘?information
	int?pid;???//pid
	int?ppid;	//parent?pid
	char?process_name[1024];	//process?name
	pid_info*?child;	//child?node
	pid_info*?next_sibling;		//brother?node
	pid_info（）:child（NULL）next_sibling（NULL）pid（0）ppid（0）{}??//initialize
	pid_info（pid_info&?pi）{???//copy?constructor
		pid?=?pi.pid;
		ppid=pi.ppid;
		strcpy（process_namepi.process_name）;
		child?=?pi.child;
		next_sibling?=?pi.next_sibling;
	}
	pid_info&operator?=?（const?pid_info&?pi）{???//operator?=?overload
		if（this?==?&pi）
			return?*this;
		pid?=?pi.pid;
		ppid=pi.ppid;
		strcpy（process_namepi.process_name）;
		child?=?pi.child;
		ne