bnb20是荷兰Groningen大学Koert Kuipers编写的解决一般非线性整数规划问题的工具包，非常好的工具。但是由于年代久远，经修改后可以在matlab2015上使用。-bnb20 solve Netherlands Groningen University Koert Kuipers prepared by the general nonlinear integer programming problem toolkit, very good tool. However, due to age, it can be used on matlab2015 as amended.