根据回避原则，要求评委不能阅自己学校的试卷，请给出试卷合理的均衡分配方案的数学模型，使各评委阅卷工作量均衡-In accordance with the principle to avoid asking the judges can not read the papers in their own school, please give a balanced and rational distribution of papers in the mathematical model of the program to balance the workload of the judges scoring