给出集合类的定义，可模拟实现集合的交集，并集运算，并可以插入，删除元素-is set class definition can be simulated to achieve the intersection and set computing, and can be inserted, deleted elements

C++集合类，有写好的类函数及测试程序。-C++,integerset class,has test exe in it.

c++编写的一个time类，可将时间转化为总秒数再转化为时间(C++ writes sets and handles collection relationships)