多元集合(MultiSet)和集合(Set)相像，只不过支持重复对象。
begin()返回指向第一个元素的迭代器
clear()清除所有元素
count()返回指向某个值元素的个数
empty()如果集合为空，返回true
end()返回指向最后一个元素的迭代器
equal_range()返回集合中与给定值相等的上下限的两个迭代器
erase()删除集合中的元素
find()返回一个指向被查找到元素的迭代器
get_allocator()返回多元集合的分配器
insert()在集合中插入元素
key_comp()返回一个用于元素间值比较的函数
lower_bound()返回指向大于（或等于）某值的第一个元素的迭代器
max_size()返回集合能容纳的元素的最大限值
rbegin()返回指向多元集合中最后一个元素的反向迭代器
rend()返回指向多元集合中第一个元素的反向迭代器
size()多元集合中元素的数目
swap()交换两个多元集合变量
upper_bound()返回一个大于某个值元素的迭代器
value_comp()返回一个用于比较元素间的值的函数
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