C# 或Java 怎么实现类似 传入6 得到 3-3,2-4,1-5 ，传入5得到2-3,1-4这样的效果

Question

public List<AutoCompleteGroup> SetAchieveArithmetic(int groupNumber)
{
            List<AutoCompleteGroup> autoCompleteList = new List<AutoCompleteGroup>();
            if (groupNumber % 2 == 0)   //偶数
            {
                int number = groupNumber / 2;
                for (int i = 0; i < number; i++)
                {
                    number = number - i;
                    AutoCompleteGroup autoComplete = new AutoCompleteGroup();
                    autoComplete.GradeType = i;
                    autoComplete.Number1 = number;
                    autoComplete.Number2 = groupNumber - autoComplete.Number1;
                    autoCompleteList.Add(autoComplete);
                }
            }
            else //奇数
            {
                int number = (groupNumber - 1) / 2;
                for (int i = 0; i < number; i++)
                {
                    number = number - i;
                    AutoCompleteGroup autoComplete = new AutoCompleteGroup();
                    autoComplete.GradeType = i;
                    autoComplete.Number1 = number;
                    autoComplete.Number2 = groupNumber - autoComplete.Number1;
                    autoCompleteList.Add(autoComplete);
                }
            }
            return autoCompleteList;
        }
                
                
public class AutoCompleteGroup
 {
        /// <summary>
        /// 优先等级 0为最高
        /// </summary>
        public int GradeType { get; set; }

        /// <summary>
        /// 成团数1        
        /// </summary>
        public int Number1 { get; set; }

        /// <summary>
        /// 成团数2
        /// </summary>
        public int Number2 { get; set; }
}

这样子写存在 如果传入6 只能计算出 3-3 2-4 , 1-5出不来，谁能优化一下

Answer 1

number = number - i;这段代码有问题，
需要定义一个变量,

int temp=number;
temp = temp - i;

就可以了