@[YJZoier](/space/show?uid=31635) thx
by a2956331800 @ 2018-12-22 17:05:04
后排安利**博客** [C++ STL之集合(set, multiset)初涉](https://yjzoier.gitee.io/hexo/p/cb3f.html)
by yingjz @ 2018-12-22 17:08:21
upper_bound(start,end,x):找到从start到end中最小的**大于**x的数
lower_bound(start,end,x):找到从start到end中最小的**大于等于**x的数
by robbie @ 2018-12-22 22:27:05