The problem is known as NP hard no matter whether group sub lotting is admissible or not.
无论是对于成组加工情形还是分组情形，该问题都可以被证明是NP困难的。
2
Can treat difficult objectively, virtuous tolerant improve oneself, not content with one's lotting, principle that I conduct oneself.
能客观地对待困难，贤惠、宽容、自强、知足、是我做人的原则。
3
This paper introduces several methods to generate random Numbers and their advantages and shortcomings, and at last realizes the application of random Numbers in the field of "online lotting system".