中文说明：
对于经典np问题矩形排样问题通过遗传算法进行优化，从而原料利用率，降低废料面积，提升厂家利益。
English Description：
For the classical NP problem, the rectangular packing problem is optimized by genetic algorithm, so as to reduce the utilization rate of raw materials, reduce the waste area and enhance the interests of manufacturers