分组策略的算法

1：按确定的组数来分（要尽量使小组的人数平衡，此处用的是解二元一次方程组的办法）
                                            iStudentTotal；//一个班的总的学生数
                                            iGroupNumber；//要分的组数
                                            int iup = iStudentTotal / iGroupNumber+1;//取每组人数的上限值
                                            int iDown = iStudentTotal / iGroupNumber;//取每组人数的下限值
                                            int iupx = iStudentTotal - iDown * iGroupNumber;//x为小组人数为iup的小组的数目
                                            int iCountSutdent = 0;//标记每个小组的人数
                                            int iCountGroup = 1;//标记小组数目（到现在分了多少个组了）
                                            int i = 1;//分配小组ID的号码
                                            group = new SGrid.APP.Group();
                                            group.IGroupID = checkClass.IClassID * iBase + i++;
                                            group.SGroupName = group.IGroupID.ToString() + "组";
                                            group.Save();
                                            checkClass.Link(group);
                                            foreach (Student studentItem in lsStudent)
                                            {
                                                  if (iCountSutdent == iup&&iCountGroup <= iupx )
                                                    {
                                                        iCountSutdent = 0;
                                                        iCountGroup++;
                                                        group = new SGrid.APP.Group();
                                                        group.IGroupID = checkClass.IClassID * iBase + i++;
                                                        group.SGroupName = group.IGroupID.ToString() + "组";
                                                        group.Save();
                                                        checkClass.Link(group);
                                                    }
                                                    else if (iCountSutdent == iDown&&iCountGroup >iupx)
                                                    {
                                                        iCountSutdent = 0;
                                                        iCountGroup++;
                                                        group = new SGrid.APP.Group();
                                                        group.IGroupID = checkClass.IClassID * iBase + i++;
                                                        group.SGroupName = group.IGroupID.ToString() + "组";
                                                        group.Save();
                                                        checkClass.Link(group);  
                                                    }
                                           
                                                group.Link(studentItem);
                                                iCountSutdent ++;
                                            }
                                            
                                        }
                                       
2：按每组多少人来分（最后一组剩余多少人就算多少）
                                    int i = 1;
                                    int iCountStudent = 0;
                                    group = new SGrid.APP.Group();
                                    group.IGroupID = checkClass.IClassID * iBase + i++;
                                    group.SGroupName = group.IGroupID.ToString() + "组";
                                    group.Save();
                                    checkClass.Link(group);
                                    foreach (Student studentItem in lsStudent)
                                    {
                                        if (iCountStudent == iGroupNumber)
                                        {
                                            iCountStudent = 0;
                                            group = new SGrid.APP.Group();
                                            group.IGroupID = checkClass.IClassID * iBase + i++;
                                            group.SGroupName = group.IGroupID.ToString() + "组";
                                            group.Save();
                                            checkClass.Link(group);
                                        }
                                        group.Link(studentItem);
                                        iCountStudent ++;
                                    }

                                }