/*Chuong trinh mo phong cac giai thuat lap trinh CPU nhu FCFS , Priority , SJF , RR
-Data Input:
+So luong tien trinh (N)
+Thoi diem tien trinh vao RL
+Do uu tien cua tien trinh
+THoi gian thuc hien cua tien trinh
i-Data output
+Bieu do grantt trong tung giai thuat
+Thoi gian cho trung binh cua moi tien trinh