2018年中青杯研究生组数学建模B题：开放生育限制政策，包括源代码与相关材料(2018 Youth Cup graduate group mathematical modeling B Title: open birth restriction policy, including source code and related materials.)

2018年全国二等奖数据及程序文件，是否顶顶顶顶(2018 national second prize data and program files)