qm算法

代码说明：

  QM算法是用来最小化卡诺图的一个算法，其大概思路是，对蕴含项中1的个数进行分组，只有1的个数相差为1的蕴含项才可能相邻，所以可以通过循环来穷举出所有的主蕴含项。(The QM algorithm is an algorithm used to minimize the Kano map. The idea is that the number of 1 of the implying items is grouped and only 1 of the implication items with a difference of 1 may be adjacent, so that all the main implication items can be given out through the cycle.)