固定金额和人数红包分配算法

/// <summary>
/// 生成红包数组
/// </summary>
/// <param name="totalMoney">总金额</param>
/// <param name="perMax">最大金额</param>
/// <param name="perMin">最小金额</param>
/// <param name="totalUser">总人数</param>
static decimal[] CalueHB(int totalMoney, decimal perMax, decimal perMin, int totalUser)
{
int i = 0; //第几人
decimal[] array = new decimal[totalUser];//分配结果集
Random ran = new Random();

for (i = 0; i < totalUser; i++) //保证每个人有最小金额+随机值
{
array[i] = perMin + Math.Round((Convert.ToDecimal(ran.NextDouble()) * (totalMoney / totalUser - perMin - 1)), 2);
}

decimal yet = array.Sum(); // 已分配的总金额
decimal thisM = 0M; //当前随机分配金额

while (yet < totalMoney)
{
thisM = Math.Round((Convert.ToDecimal(ran.NextDouble()) * (perMax - perMin - 1)), 2);

i = ran.Next(0, totalUser); //随机选择人
if (yet + thisM > totalMoney)
{
thisM = totalMoney - yet;
}

if (array[i] + thisM < perMax)//判断是否超出最大金额
{
array[i] += thisM;
yet += thisM;
}
}

Array.Sort(array);

yet = 0;
for (i = 0; i < totalUser; i++)
{
yet += array[i];
Console.Write("第{0}人=>分配{1}元，合计分配{2}元\r\n", (i + 1).ToString().PadLeft(3, ' '), array[i].ToString("f2").PadLeft(8, ' '), yet.ToString("f2").PadLeft(8, ' '));
}

return array;
}