C语音名题100中的一道习题 编写一个程序，用gray码的顺序列出一个集合的所有子集。 （所谓gray码，就是相邻的集合间，只有一个不同的元素）-C voice of title 100 of an Exercise to prepare a program, using gray code listed in the order of a collection of all subset. (The so-called gray code, that is adjacent to th